{"id":52964,"date":"2023-04-21T12:20:25","date_gmt":"2023-04-21T17:20:25","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/can-speakers-produce-ultrasound\/"},"modified":"2025-01-21T07:06:32","modified_gmt":"2025-01-21T12:06:32","slug":"can-speakers-produce-ultrasound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/can-speakers-produce-ultrasound\/","title":{"rendered":"Loa c\u00f3 th\u1ec3 ph\u00e1t ra si\u00eau \u00e2m? Kh\u00e1m ph\u00e1 gi\u1edbi h\u1ea1n \u00e2m thanh"},"content":{"rendered":"

Loa, m\u1ed9t thi\u1ebft b\u1ecb quen thu\u1ed9c trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 t\u00e1i t\u1ea1o \u00e2m thanh. Ch\u00fang ta nghe nh\u1ea1c, xem phim, tr\u00f2 chuy\u1ec7n qua \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec1u nh\u1edd v\u00e0o kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec7n th\u00e0nh s\u00f3ng \u00e2m c\u1ee7a loa. Tuy nhi\u00ean, li\u1ec7u loa c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m, lo\u1ea1i s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi hay kh\u00f4ng? \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi th\u00fa v\u1ecb v\u00e0 b\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o ph\u00e2n t\u00edch kh\u1ea3 n\u0103ng n\u00e0y.<\/p>\n

Kh\u00e1i ni\u1ec7m v\u1ec1 s\u00f3ng si\u00eau \u00e2m v\u00e0 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi<\/h3>\n

S\u00f3ng si\u00eau \u00e2m l\u00e0 s\u00f3ng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 tr\u00ean 20 kHz. Tai ng\u01b0\u1eddi b\u00ecnh th\u01b0\u1eddng ch\u1ec9 c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m thanh trong kho\u1ea3ng t\u1eeb 20 Hz \u0111\u1ebfn 20 kHz. \u00c2m thanh c\u00f3 t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n 20 Hz \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u1ea1 \u00e2m, c\u00f2n \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n 20 kHz \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 si\u00eau \u00e2m.<\/p>\n

Gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a loa truy\u1ec1n th\u1ed1ng<\/h3>\n

Loa truy\u1ec1n th\u1ed1ng, v\u1edbi m\u00e0ng loa \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 nghe \u0111\u01b0\u1ee3c, g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3. M\u00e0ng loa th\u01b0\u1eddng qu\u00e1 l\u1edbn v\u00e0 n\u1eb7ng \u0111\u1ec3 dao \u0111\u1ed9ng \u0111\u1ee7 nhanh \u0111\u1ec3 t\u1ea1o ra t\u1ea7n s\u1ed1 si\u00eau \u00e2m. Vi\u1ec7c c\u1ed1 g\u1eafng \u0111\u1ea9y loa truy\u1ec1n th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 cao c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u00e9o ti\u1ebfng, h\u01b0 h\u1ecfng loa, v\u00e0 hi\u1ec7u su\u1ea5t k\u00e9m.<\/p>\n

Loa \u00e1p \u0111i\u1ec7n v\u00e0 kh\u1ea3 n\u0103ng t\u1ea1o s\u00f3ng si\u00eau \u00e2m<\/h3>\n

Kh\u00e1c v\u1edbi loa truy\u1ec1n th\u1ed1ng, loa \u00e1p \u0111i\u1ec7n s\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra s\u00f3ng \u00e2m. M\u1ed9t s\u1ed1 lo\u1ea1i v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n c\u00f3 kh\u1ea3 n\u0103ng dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 r\u1ea5t cao, cho ph\u00e9p ch\u00fang t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m. Loa \u00e1p \u0111i\u1ec7n th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m, ki\u1ec3m tra v\u1eadt li\u1ec7u kh\u00f4ng ph\u00e1 h\u1ee7y, v\u00e0 trong y t\u1ebf.<\/p>\n

C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng t\u1ea1o s\u00f3ng si\u00eau \u00e2m c\u1ee7a loa<\/h3>\n\n\n\n\n\n\n\n\n
Y\u1ebfu t\u1ed1<\/th>\n\u1ea2nh h\u01b0\u1edfng<\/th>\n<\/tr>\n<\/thead>\n
V\u1eadt li\u1ec7u m\u00e0ng loa<\/td>\nV\u1eadt li\u1ec7u nh\u1eb9 v\u00e0 c\u1ee9ng h\u01a1n cho ph\u00e9p dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 cao h\u01a1n.<\/td>\n<\/tr>\n
Thi\u1ebft k\u1ebf cu\u1ed9n d\u00e2y<\/td>\nCu\u1ed9n d\u00e2y nh\u1ecf v\u00e0 nh\u1eb9 h\u01a1n gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i.<\/td>\n<\/tr>\n
K\u00edch th\u01b0\u1edbc loa<\/td>\nLoa nh\u1ecf h\u01a1n th\u01b0\u1eddng c\u00f3 d\u1ea3i t\u1ea7n s\u1ed1 cao h\u01a1n.<\/td>\n<\/tr>\n
B\u1ed9 khu\u1ebfch \u0111\u1ea1i<\/td>\nB\u1ed9 khu\u1ebfch \u0111\u1ea1i ph\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd t\u00edn hi\u1ec7u t\u1ea7n s\u1ed1 cao.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u1ee8ng d\u1ee5ng c\u1ee7a loa t\u1ea1o s\u00f3ng si\u00eau \u00e2m<\/h3>\n

S\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. V\u00ed d\u1ee5, trong y t\u1ebf, s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o h\u00ecnh \u1ea3nh b\u00ean trong c\u01a1 th\u1ec3. Trong c\u00f4ng nghi\u1ec7p, s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m s\u1ea1ch, h\u00e0n, v\u00e0 ki\u1ec3m tra v\u1eadt li\u1ec7u.<\/p>\n

T\u00f3m l\u1ea1i, loa truy\u1ec1n th\u1ed1ng kh\u00f3 c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3. Tuy nhi\u00ean, c\u00f4ng ngh\u1ec7 loa \u00e1p \u0111i\u1ec7n \u0111\u00e3 m\u1edf ra kh\u1ea3 n\u0103ng t\u1ea1o v\u00e0 \u1ee9ng d\u1ee5ng s\u00f3ng si\u00eau \u00e2m trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau. Vi\u1ec7c nghi\u00ean c\u1ee9u v\u00e0 ph\u00e1t tri\u1ec3n c\u00e1c lo\u1ea1i loa m\u1edbi, v\u1eadt li\u1ec7u m\u1edbi, v\u00e0 k\u1ef9 thu\u1eadt \u0111i\u1ec1u khi\u1ec3n ti\u00ean ti\u1ebfn s\u1ebd ti\u1ebfp t\u1ee5c m\u1edf r\u1ed9ng kh\u1ea3 n\u0103ng \u1ee9ng d\u1ee5ng c\u1ee7a s\u00f3ng si\u00eau \u00e2m trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"

Loa, m\u1ed9t thi\u1ebft b\u1ecb quen thu\u1ed9c trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 t\u00e1i t\u1ea1o \u00e2m thanh. Ch\u00fang ta nghe nh\u1ea1c, xem phim, tr\u00f2 chuy\u1ec7n qua \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec1u nh\u1edd v\u00e0o kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec7n th\u00e0nh s\u00f3ng \u00e2m c\u1ee7a loa. Tuy nhi\u00ean, li\u1ec7u loa c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o<\/p>\n","protected":false},"author":1,"featured_media":18685,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-52964","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/52964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=52964"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/52964\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/18685"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=52964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=52964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=52964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}