{"id":20621,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/aliasing\/"},"modified":"2026-05-23T22:13:48","modified_gmt":"2026-05-23T22:13:48","slug":"aliasing","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/vi\/glossary\/aliasing\/","title":{"rendered":"Hi\u1ec7n t\u01b0\u1ee3ng r\u0103ng c\u01b0a trong ph\u00e2n t\u00edch rung \u0111\u1ed9ng l\u00e0 g\u00ec?"},"content":{"rendered":"<h1>Hi\u1ec3u v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng ch\u1ed3ng ph\u1ed5 trong ph\u00e2n t\u00edch rung \u0111\u1ed9ng<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-1\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"B\u1ed9 \u0111\u1ea7y \u0111\u1ee7 m\u00e1y c\u00e2n b\u1eb1ng v\u00e0 ph\u00e2n t\u00edch rung \u0111\u1ed9ng c\u1ea7m tay Balanset-1A\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-1\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A\">M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,975.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/vibration-sensor\/\" title=\"C\u1ea3m bi\u1ebfn rung\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"C\u1eadn c\u1ea3nh c\u1ea3m bi\u1ebfn rung Balanset-1A\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/vibration-sensor\/\" title=\"C\u1ea3m bi\u1ebfn rung\">C\u1ea3m bi\u1ebfn rung<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>90.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\">C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>124.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"B\u1ed9 d\u1ee5ng c\u1ee5 c\u00e2n b\u1eb1ng r\u00f4to Vibromera: h\u1ed9p \u0111\u1ef1ng, b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh t\u00edn hi\u1ec7u \u0111a k\u00eanh, m\u00e1y ph\u00e2n t\u00edch c\u1ea7m tay, \u0111\u1ebf t\u1eeb, c\u1ea3m bi\u1ebfn rung v\u00e0 d\u00e2y c\u00e1p xo\u1eafn.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>6,803.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/magnet-stand\/\" title=\"\u0110\u1ebf t\u1eeb Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u0110\u1ebf nam ch\u00e2m.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/magnet-stand\/\" title=\"\u0110\u1ebf t\u1eeb Insize-60-kgf\">\u0110\u1ebf t\u1eeb Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>46.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/reflective-tape\/\" title=\"B\u0103ng ph\u1ea3n quang\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"B\u0103ng ph\u1ea3n quang\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/reflective-tape\/\" title=\"B\u0103ng ph\u1ea3n quang\">B\u0103ng ph\u1ea3n quang<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>10.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/dynamic-balancer-balanset-1a\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/vi\/product\/dynamic-balancer-balanset-1a\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"N\u1ed9i dung b\u1ed9 s\u1ea3n ph\u1ea9m Balanset-1A bao g\u1ed3m thi\u1ebft b\u1ecb giao di\u1ec7n, c\u1ea3m bi\u1ebfn, m\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 v\u00e0 c\u00e1c ph\u1ee5 ki\u1ec7n\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/vi\/product\/dynamic-balancer-balanset-1a\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d OEM\">M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,735.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/vi\/wp-json\/wp\/v2\/glossary\/20621?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>B\u00ed danh<\/strong> l\u00e0 m\u1ed9t l\u1ed7i x\u1eed l\u00fd t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 l\u00e0m sai l\u1ec7ch k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch s\u1ed1 c\u1ee7a d\u1eef li\u1ec7u rung \u0111\u1ed9ng. L\u1ed7i n\u00e0y x\u1ea3y ra khi t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu v\u1edbi t\u1ea7n s\u1ed1 qu\u00e1 th\u1ea5p \u0111\u1ec3 ghi l\u1ea1i c\u00e1c th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao nh\u1ea5t c\u1ee7a n\u00f3, do \u0111\u00f3 c\u00e1c t\u1ea7n s\u1ed1 cao n\u00e0y b\u1ecb \u201cg\u1ea5p xu\u1ed1ng\u201d v\u00e0 \u201cm\u1ea1o danh\u201d th\u00e0nh c\u00e1c t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n trong k\u1ebft qu\u1ea3 <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/fft\/\">FFT<\/a> ph\u1ed5. K\u1ebft qu\u1ea3 l\u00e0 xu\u1ea5t hi\u1ec7n c\u00e1c \u0111\u1ec9nh gi\u1ea3 v\u1ed1n kh\u00f4ng t\u1ed3n t\u1ea1i trong m\u00e1y th\u1ef1c t\u1ebf \u2014 nh\u1eefng \u0111\u1ec9nh n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ch\u1ea9n \u0111o\u00e1n sai nghi\u00eam tr\u1ecdng. Vi\u1ec7c hi\u1ec3u r\u00f5 hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u t\u1ea7n s\u1ed1 (aliasing) v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y l\u00e0 y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n \u0111\u1ec3 tin t\u01b0\u1edfng v\u00e0o b\u1ea5t k\u1ef3 h\u1ec7 th\u1ed1ng k\u1ef9 thu\u1eadt s\u1ed1 n\u00e0o <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectrum\/\">ph\u1ed5 rung \u0111\u1ed9ng<\/a>.<\/p>\n<h2>1. \u0110\u1ecbnh ngh\u0129a: Aliasing l\u00e0 g\u00ec?<\/h2>\n<p>Khi m\u1ed9t m\u00e1y ph\u00e2n t\u00edch s\u1ed1 h\u00f3a t\u00edn hi\u1ec7u rung \u0111\u1ed9ng, n\u00f3 kh\u00f4ng ghi l\u1ea1i m\u1ed9t \u0111\u01b0\u1eddng cong li\u00ean t\u1ee5c; thay v\u00e0o \u0111\u00f3, n\u00f3 ghi l\u1ea1i m\u1ed9t chu\u1ed7i c\u00e1c m\u1eabu r\u1eddi r\u1ea1c \u2014 nh\u1eefng \u201c\u1ea3nh ch\u1ee5p nhanh\u201d \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i c\u00e1c kho\u1ea3ng th\u1eddi gian c\u1ed1 \u0111\u1ecbnh. N\u1ebfu kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c \u201c\u1ea3nh ch\u1ee5p nhanh\u201d n\u00e0y qu\u00e1 l\u1edbn so v\u1edbi t\u1ed1c \u0111\u1ed9 thay \u0111\u1ed5i c\u1ee7a t\u00edn hi\u1ec7u, m\u00e1y ph\u00e2n t\u00edch th\u1ef1c s\u1ef1 kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c s\u00f3ng nhanh v\u1edbi s\u00f3ng ch\u1eadm. M\u1ed9t v\u00e0i \u0111i\u1ec3m m\u00e0 n\u00f3 thu \u0111\u01b0\u1ee3c t\u1eeb th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gh\u00e9p l\u1ea1i th\u00e0nh m\u1ed9t s\u00f3ng sin t\u1ea7n s\u1ed1 th\u1ea5p ho\u00e0n to\u00e0n h\u1ee3p l\u00fd. T\u1ea7n s\u1ed1 th\u1ea5p \u1ea3o \u0111\u00f3 ch\u00ednh l\u00e0 <em>t\u00ean g\u1ecdi kh\u00e1c<\/em>, v\u00e0 khi n\u00f3 xu\u1ea5t hi\u1ec7n trong <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectral-analysis\/\">ph\u1ed5<\/a> N\u00f3 kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c v\u1edbi dao \u0111\u1ed9ng th\u1ef1c s\u1ef1 \u1edf t\u1ea7n s\u1ed1 \u0111\u00f3.<\/p>\n<h2>2. \u0110\u1ecbnh l\u00fd Nyquist v\u00e0 t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u hi\u1ec7n t\u01b0\u1ee3ng aliasing, tr\u01b0\u1edbc ti\u00ean b\u1ea1n ph\u1ea3i hi\u1ec3u <strong>\u0110\u1ecbnh l\u00fd Nyquist<\/strong> (\u0111\u1ecbnh l\u00fd l\u1ea5y m\u1eabu Nyquist\u2013Shannon). Nguy\u00ean l\u00fd c\u01a1 b\u1ea3n n\u00e0y c\u1ee7a x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1 n\u00eau r\u00f5:<\/p>\n<blockquote><p>\n    <em>\u0110\u1ec3 chuy\u1ec3n \u0111\u1ed5i ch\u00ednh x\u00e1c t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 sang d\u1ea1ng s\u1ed1, t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu (F<sub>s<\/sub>) ph\u1ea3i l\u1edbn g\u1ea5p \u00edt nh\u1ea5t hai l\u1ea7n th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao nh\u1ea5t (F<sub>max<\/sub>) c\u00f3 trong t\u00edn hi\u1ec7u.<\/em>\n<\/p><\/blockquote>\n<p>T\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu t\u1ed1i thi\u1ec3u n\u00e0y (2 \u00d7 F<sub>max<\/sub>) \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong>T\u1ef7 l\u1ec7 Nyquist<\/strong>. Ng\u01b0\u1ee3c l\u1ea1i, t\u1ea7n s\u1ed1 cao nh\u1ea5t m\u00e0 m\u1ed9t t\u1ed1c \u0111\u1ed9 l\u1ea5y m\u1eabu nh\u1ea5t \u0111\u1ecbnh c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng ch\u00ednh x\u00e1c l\u00e0 m\u1ed9t n\u1eeda c\u1ee7a n\u00f3: F<sub>max<\/sub> = F<sub>s<\/sub> \/ 2. M\u1ee9c tr\u1ea7n \u0111\u00f3 l\u00e0 <strong>T\u1ea7n s\u1ed1 Nyquist<\/strong>. B\u1ea5t k\u1ef3 t\u1ea7n s\u1ed1 th\u1ef1c n\u00e0o cao h\u01a1n t\u1ea7n s\u1ed1 Nyquist \u0111\u1ec1u kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c t\u00e1i hi\u1ec7n ch\u00ednh x\u00e1c v\u00e0 thay v\u00e0o \u0111\u00f3 s\u1ebd b\u1ecb ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i xu\u1ed1ng d\u01b0\u1edbi m\u1ee9c \u0111\u00f3. Tr\u00ean th\u1ef1c t\u1ebf, t\u1ea7n s\u1ed1 F \u0111\u01b0\u1ee3c ch\u1ecdn<sub>max<\/sub> c\u0169ng x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a ph\u00e2n t\u00edch c\u00f9ng v\u1edbi s\u1ed1 d\u00f2ng FFT \u2014 m\u1ed9t m\u1ed1i quan h\u1ec7 m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/calculators\/fft-resolution-calculator\/\">M\u00e1y t\u00ednh \u0111\u1ed9 ph\u00e2n gi\u1ea3i FFT<\/a> khi l\u1eadp k\u1ebf ho\u1ea1ch \u0111o l\u01b0\u1eddng.<\/p>\n<h2>3. Hi\u1ec7n t\u01b0\u1ee3ng r\u0103ng c\u01b0a x\u1ea3y ra nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t dao \u0111\u1ed9ng t\u1ea7n s\u1ed1 cao \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng m\u00e1y ph\u00e2n t\u00edch k\u1ef9 thu\u1eadt s\u1ed1, l\u1ea5y c\u00e1c m\u1eabu r\u1eddi r\u1ea1c v\u1edbi t\u1ea7n su\u1ea5t c\u1ed1 \u0111\u1ecbnh:<\/p>\n<ul>\n<li>N\u1ebfu t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu \u0111\u1ee7 cao \u2014 cao h\u01a1n nhi\u1ec1u so v\u1edbi t\u1ea7n s\u1ed1 Nyquist \u2014 th\u00ec m\u00e1y ph\u00e2n t\u00edch s\u1ebd thu \u0111\u01b0\u1ee3c \u0111\u1ee7 s\u1ed1 \u0111i\u1ec3m tr\u00ean m\u1ed7i chu k\u1ef3 \u0111\u1ec3 t\u00e1i t\u1ea1o d\u1ea1ng s\u00f3ng m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/li>\n<li>N\u1ebfu t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu qu\u00e1 th\u1ea5p, m\u00e1y ph\u00e2n t\u00edch s\u1ebd b\u1ecf s\u00f3t nh\u1eefng g\u00ec di\u1ec5n ra gi\u1eefa c\u00e1c l\u1ea7n l\u1ea5y m\u1eabu. S\u1ed1 \u00edt \u0111i\u1ec3m d\u1eef li\u1ec7u m\u00e0 n\u00f3 thu \u0111\u01b0\u1ee3c s\u1ebd gh\u00e9p l\u1ea1i th\u00e0nh m\u1ed9t s\u00f3ng sin ho\u00e0n to\u00e0n kh\u00e1c, c\u00f3 t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n. T\u1ea7n s\u1ed1 th\u1ea5p gi\u1ea3 t\u1ea1o \u0111\u00f3 ch\u00ednh l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u t\u1ea7n.<\/li>\n<\/ul>\n<p>M\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3: gi\u1ea3 s\u1eed m\u1ed9t t\u00edn hi\u1ec7u ch\u1ee9a m\u1ed9t th\u00e0nh ph\u1ea7n th\u1ef1c 900 Hz nh\u01b0ng t\u1ea7n s\u1ed1 F c\u1ee7a m\u00e1y ph\u00e2n t\u00edch<sub>max<\/sub> \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf m\u1ee9c 500 Hz, t\u01b0\u01a1ng \u1ee9ng v\u1edbi t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu l\u00e0 1000 Hz. Th\u00e0nh ph\u1ea7n 900 Hz n\u1eb1m tr\u00ean t\u1ea7n s\u1ed1 Nyquist 500 Hz v\u00e0 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c \u0111o ch\u00ednh x\u00e1c. N\u00f3 b\u1ecb hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u t\u1ea7n s\u1ed1 v\u00e0 xu\u1ea5t hi\u1ec7n l\u1ea1i t\u1ea1i t\u1ea7n s\u1ed1 F<sub>s<\/sub> \u2212 900 = 1000 \u2212 900 = 100 Hz. M\u1ed9t nh\u00e0 ph\u00e2n t\u00edch \u0111ang qu\u00e9t ph\u1ed5 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng nh\u1ea7m l\u1eabn \u0111\u1ec9nh 100 Hz \u0111\u00f3 v\u1edbi m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/running-speed\/\">1\u00d7 t\u1ed1c \u0111\u1ed9 ch\u1ea1y<\/a> rung \u0111\u1ed9ng, ho\u1eb7c nh\u1ea7m l\u1eabn v\u1edbi m\u1ed9t l\u1ed7i th\u1ef1c s\u1ef1, v\u00e0 \u0111i t\u00ecm m\u1ed9t l\u1ed7i kh\u00f4ng t\u1ed3n t\u1ea1i. T\u1ec7 h\u01a1n n\u1eefa, c\u00e1c ngu\u1ed3n g\u00e2y nhi\u1ec5u t\u1ea7n s\u1ed1 cao \u2014 ti\u1ebfng va \u0111\u1eadp c\u1ee7a \u1ed5 tr\u1ee5c, n\u0103ng l\u01b0\u1ee3ng t\u1eeb s\u1ef1 c\u1ecd x\u00e1t c\u1ee7a b\u00e1nh r\u0103ng, nhi\u1ec5u \u0111i\u1ec7n \u2014 l\u1ea1i th\u01b0\u1eddng ch\u00ednh l\u00e0 nh\u1eefng t\u00edn hi\u1ec7u m\u00e0 nh\u00e0 ph\u00e2n t\u00edch mu\u1ed1n tin t\u01b0\u1edfng nh\u1ea5t.<\/p>\n<h2>4. Ng\u0103n ch\u1eb7n hi\u1ec7n t\u01b0\u1ee3ng r\u0103ng c\u01b0a: B\u1ed9 l\u1ecdc ch\u1ed1ng r\u0103ng c\u01b0a<\/h2>\n<p>Kh\u00f4ng th\u1ec3 bi\u1ebft tr\u01b0\u1edbc \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao m\u00e0 t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 mang theo \u2014 ti\u1ebfng \u1ed3n si\u00eau \u00e2m, c\u00e1c va ch\u1ea1m m\u1ea1nh, nhi\u1ec5u t\u1ea7n s\u1ed1 v\u00f4 tuy\u1ebfn v\u00e0 nhi\u1ec5u \u0111i\u1ec7n \u0111\u1ec1u c\u00f3 th\u1ec3 x\u00e2m nh\u1eadp v\u00e0o t\u00edn hi\u1ec7u. Do \u0111\u00f3, ch\u1ec9 \u0111\u01a1n thu\u1ea7n hy v\u1ecdng r\u1eb1ng t\u1ed1c \u0111\u1ed9 l\u1ea5y m\u1eabu \u0111\u1ee7 cao kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c an to\u00e0n.<\/p>\n<p>Gi\u1ea3i ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ecdi m\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng k\u1ef9 thu\u1eadt s\u1ed1 hi\u1ec7n \u0111\u1ea1i l\u00e0 <strong>b\u1ed9 l\u1ecdc ch\u1ed1ng ch\u1ed3ng ph\u1ed5<\/strong>: d\u1ed1c <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/low-pass-filter\/\">b\u1ed9 l\u1ecdc th\u00f4ng th\u1ea5p<\/a> \u0111\u01b0\u1ee3c \u0111\u1eb7t trong \u0111\u01b0\u1eddng d\u1eabn t\u00edn hi\u1ec7u <em>tr\u01b0\u1edbc<\/em> b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1-s\u1ed1 (ADC). C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3 nh\u01b0 sau:<\/p>\n<ol>\n<li>Ng\u01b0\u1eddi d\u00f9ng thi\u1ebft l\u1eadp t\u1ea7n s\u1ed1 t\u1ed1i \u0111a mong mu\u1ed1n, F<sub>max<\/sub>, \u0111\u1ec3 ph\u1ee5c v\u1ee5 cho vi\u1ec7c ph\u00e2n t\u00edch.<\/li>\n<li>D\u1ef1a tr\u00ean \u0111i\u1ec1u \u0111\u00f3 F<sub>max<\/sub>, m\u00e1y ph\u00e2n t\u00edch s\u1ebd t\u1ef1 \u0111\u1ed9ng \u0111\u1eb7t t\u1ea7n s\u1ed1 c\u1eaft c\u1ee7a b\u1ed9 l\u1ecdc ch\u1ed1ng r\u0103ng c\u01b0a ngay tr\u00ean F<sub>max<\/sub>.<\/li>\n<li>Phi\u00ean b\u1ea3n analog <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/transducer\/\">c\u1ea3m bi\u1ebfn<\/a> t\u00edn hi\u1ec7u \u0111i qua b\u1ed9 l\u1ecdc, b\u1ed9 l\u1ecdc n\u00e0y lo\u1ea1i b\u1ecf ho\u1eb7c l\u00e0m suy gi\u1ea3m m\u1ea1nh m\u1ecdi th\u00e0nh ph\u1ea7n c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n t\u1ea7n s\u1ed1 c\u1eaft.<\/li>\n<li>Ch\u1ec9 c\u00f3 t\u00edn hi\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1ecdc v\u00e0 l\u00e0m s\u1ea1ch m\u1edbi \u0111\u01b0\u1ee3c truy\u1ec1n \u0111\u1ebfn b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1-s\u1ed1 (ADC) \u0111\u1ec3 l\u1ea5y m\u1eabu.<\/li>\n<\/ol>\n<p>V\u00ec b\u1ed9 l\u1ecdc lo\u1ea1i b\u1ecf c\u00e1c t\u1ea7n s\u1ed1 cao m\u00e0 t\u1ed1c \u0111\u1ed9 l\u1ea5y m\u1eabu \u0111\u00e3 ch\u1ecdn kh\u00f4ng th\u1ec3 x\u1eed l\u00fd \u0111\u01b0\u1ee3c <em>tr\u01b0\u1edbc<\/em> Khi qu\u00e1 tr\u00ecnh l\u1ea5y m\u1eabu di\u1ec5n ra, hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u t\u1ea7n s\u1ed1 (aliasing) tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 x\u1ea3y ra v\u1ec1 m\u1eb7t v\u1eadt l\u00fd. M\u1ed9t b\u1ed9 l\u1ecdc th\u1ef1c t\u1ebf kh\u00f4ng th\u1ec3 c\u1eaft t\u1ea7n s\u1ed1 m\u1ed9t c\u00e1ch v\u00f4 c\u00f9ng s\u1eafc n\u00e9t, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao t\u1ea7n s\u1ed1 c\u1eaft \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u1ea5p h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi t\u1ea7n s\u1ed1 Nyquist \u0111\u1ec3 t\u1ea1o ra m\u1ed9t d\u1ea3i an to\u00e0n \u1edf ph\u1ea7n vi\u1ec1n c\u1ee7a n\u00f3. B\u1ed9 l\u1ecdc ch\u1ed1ng nhi\u1ec5u l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t c\u1ee7a b\u1ea5t k\u1ef3 m\u00e1y ph\u00e2n t\u00edch n\u00e0o, \u0111\u1ea3m b\u1ea3o r\u1eb1ng k\u1ebft qu\u1ea3 FFT l\u00e0 h\u00ecnh \u1ea3nh ch\u00ednh x\u00e1c v\u00e0 trung th\u1ef1c v\u1ec1 dao \u0111\u1ed9ng c\u1ee7a m\u00e1y trong ph\u1ea1m vi \u0111\u00e3 ch\u1ecdn. L\u01b0u \u00fd r\u1eb1ng qu\u00e1 tr\u00ecnh l\u1ecdc n\u00e0y ph\u1ea3i l\u00e0 analog v\u00e0 ph\u1ea3i di\u1ec5n ra tr\u01b0\u1edbc qu\u00e1 tr\u00ecnh s\u1ed1 h\u00f3a \u2014 vi\u1ec7c \u00e1p d\u1ee5ng <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/signal-filtering\/\">l\u1ecdc s\u1ed1<\/a> Sau khi ADC \u0111\u00e3 x\u1eed l\u00fd, kh\u00f4ng th\u1ec3 h\u1ee7y b\u1ecf m\u1ed9t t\u00ean g\u1ecdi kh\u00e1c, b\u1edfi v\u00ec l\u00fac \u0111\u00f3 t\u1ea7n s\u1ed1 sai \u0111\u00e3 \u0111\u01b0\u1ee3c ghi c\u1ed1 \u0111\u1ecbnh v\u00e0o d\u1eef li\u1ec7u.<\/p>\n<h2>5. \u00dd ngh\u0129a th\u1ef1c ti\u1ec5n \u0111\u1ed1i v\u1edbi nh\u00e0 ph\u00e2n t\u00edch<\/h2>\n<p>\u0110\u1ed1i v\u1edbi k\u1ef9 s\u01b0 l\u00e0m vi\u1ec7c t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, b\u00e0i h\u1ecdc \u1edf \u0111\u00e2y l\u00e0 ph\u1ea3i tu\u00e2n th\u1ee7 c\u00e1c c\u00e0i \u0111\u1eb7t t\u1ea7n s\u1ed1 c\u1ee7a thi\u1ebft b\u1ecb. Ch\u1ecdn F<sub>max<\/sub> qu\u00e1 th\u1ea5p \u0111\u1ec3 duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectral-leakage\/\">quy\u1ebft \u0111\u1ecbnh<\/a> c\u00e1c \u0111\u1ec9nh t\u1ea7n s\u1ed1 th\u1ea5p c\u00f3 th\u1ec3 che l\u1ea5p th\u00f4ng tin t\u1ea7n s\u1ed1 cao quan tr\u1ecdng; b\u1ed9 l\u1ecdc ch\u1ed1ng nhi\u1ec5u s\u1ebd gi\u00fap b\u1ea1n tr\u00e1nh \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1ec9nh gi\u1ea3, nh\u01b0ng n\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec3n th\u1ecb n\u0103ng l\u01b0\u1ee3ng m\u00e0 b\u1ea1n \u0111\u00e3 l\u1ecdc b\u1ecf. C\u00e1c thi\u1ebft b\u1ecb \u0111\u00e1ng tin c\u1eady s\u1ebd t\u1ef1 \u0111\u1ed9ng x\u1eed l\u00fd v\u1ea5n \u0111\u1ec1 n\u00e0y \u2014 m\u1ed9t m\u00e1y ph\u00e2n t\u00edch c\u1ea7m tay nh\u01b0 <a href=\"https:\/\/vibromera.eu\/vi\/san-pham\/balanset-1\/\">Balanset-1A<\/a> thi\u1ebft b\u1ecb n\u00e0y th\u1ef1c hi\u1ec7n kh\u1eed r\u0103ng c\u01b0a b\u1eb1ng ph\u1ea7n c\u1ee9ng tr\u01b0\u1edbc b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1-s\u1ed1 (ADC), do \u0111\u00f3 c\u00e1c ph\u1ed5 t\u1ea7n s\u1ed1 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb cho m\u1ee5c \u0111\u00edch ch\u1ea9n \u0111o\u00e1n v\u00e0 t\u00edn hi\u1ec7u bi\u00ean \u0111\u1ed9-g\u00f3c pha 1\u00d7 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u00e2n b\u1eb1ng \u0111\u1ec1u kh\u00f4ng ch\u1ee9a c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u do r\u0103ng c\u01b0a trong to\u00e0n b\u1ed9 d\u1ea3i ho\u1ea1t \u0111\u1ed9ng. Nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd: \u0111\u1eb7t F<sub>max<\/sub> \u0111\u1ee7 cao \u0111\u1ec3 bao qu\u00e1t t\u1ea7n s\u1ed1 l\u1ed7i cao nh\u1ea5t m\u00e0 b\u1ea1n quan t\u00e2m, tin t\u01b0\u1edfng r\u1eb1ng m\u1ed9t m\u00e1y ph\u00e2n t\u00edch \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u00fang c\u00e1ch s\u1ebd kh\u00f4ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u t\u1ea7n s\u1ed1, v\u00e0 h\u00e3y xem x\u00e9t b\u1ea5t k\u1ef3 \u0111\u1ec9nh t\u1ea7n s\u1ed1 th\u1ea5p n\u00e0o kh\u00f4ng r\u00f5 nguy\u00ean nh\u00e2n v\u1edbi th\u00e1i \u0111\u1ed9 th\u1eadn tr\u1ecdng cho \u0111\u1ebfn khi b\u1ea1n \u0111\u00e3 lo\u1ea1i tr\u1eeb \u0111\u01b0\u1ee3c c\u00e1c nguy\u00ean nh\u00e2n kh\u00e1c.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/vi\/glossary\/\">\u2190 Quay l\u1ea1i M\u1ee5c l\u1ee5c ch\u00ednh<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng r\u0103ng c\u01b0a, m\u1ed9t l\u1ed7i x\u1eed l\u00fd t\u00edn hi\u1ec7u trong ph\u00e2n t\u00edch rung \u0111\u1ed9ng k\u1ef9 thu\u1eadt s\u1ed1 x\u1ea3y ra khi t\u1ed1c \u0111\u1ed9 l\u1ea5y m\u1eabu qu\u00e1 th\u1ea5p, khi\u1ebfn t\u1ea7n s\u1ed1 cao b\u1eaft ch\u01b0\u1edbc t\u1ea7n s\u1ed1 th\u1ea5p.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-20621","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/20621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/20621\/revisions"}],"predecessor-version":[{"id":101190,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/20621\/revisions\/101190"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/media?parent=20621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/categories?post=20621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/tags?post=20621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}