{"id":52076,"date":"2023-04-21T13:10:50","date_gmt":"2023-04-21T18:10:50","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/diy-parametric-speaker\/"},"modified":"2025-01-21T07:08:52","modified_gmt":"2025-01-21T12:08:52","slug":"diy-parametric-speaker","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/diy-parametric-speaker\/","title":{"rendered":"T\u1ef1 ch\u1ebf loa si\u00eau \u0111\u1ecbnh h\u01b0\u1edbng: C\u00f4ng ngh\u1ec7 \u00e2m thanh t\u01b0\u01a1ng lai"},"content":{"rendered":"

Loa tham s\u1ed1, hay c\u00f2n g\u1ecdi l\u00e0 loa si\u00eau \u00e2m, l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 \u00e2m thanh h\u01b0\u1edbng t\u00ednh, cho ph\u00e9p t\u1eadp trung \u00e2m thanh v\u00e0o m\u1ed9t khu v\u1ef1c h\u1eb9p, gi\u1ed1ng nh\u01b0 m\u1ed9t ch\u00f9m tia s\u00e1ng. \u0110i\u1ec1u n\u00e0y kh\u00e1c bi\u1ec7t ho\u00e0n to\u00e0n so v\u1edbi loa truy\u1ec1n th\u1ed1ng, n\u01a1i \u00e2m thanh lan t\u1ecfa theo m\u1ecdi h\u01b0\u1edbng. Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t loa tham s\u1ed1, tuy c\u00f3 ph\u1ea7n ph\u1ee9c t\u1ea1p, l\u1ea1i l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb cho nh\u1eefng ng\u01b0\u1eddi \u0111am m\u00ea \u0111i\u1ec7n t\u1eed v\u00e0 \u00e2m thanh. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n t\u1eebng b\u01b0\u1edbc th\u1ef1c hi\u1ec7n \u0111i\u1ec1u \u0111\u00f3.<\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a loa tham s\u1ed1<\/h3>\n

Loa tham s\u1ed1 ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd bi\u1ebfn \u0111i\u1ec7u bi\u00ean \u0111\u1ed9 c\u1ee7a s\u00f3ng si\u00eau \u00e2m. S\u00f3ng mang si\u00eau \u00e2m, n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi (th\u01b0\u1eddng tr\u00ean 20kHz), \u0111\u01b0\u1ee3c \u0111i\u1ec1u bi\u1ebfn b\u1eb1ng t\u00edn hi\u1ec7u \u00e2m thanh m\u00e0 ch\u00fang ta mu\u1ed1n nghe. Khi s\u00f3ng si\u00eau \u00e2m lan truy\u1ec1n trong kh\u00f4ng kh\u00ed, t\u00ednh phi tuy\u1ebfn c\u1ee7a kh\u00f4ng kh\u00ed s\u1ebd t\u1ea1o ra c\u00e1c s\u00f3ng \u00e2m thanh m\u1edbi, bao g\u1ed3m c\u1ea3 t\u1ea7n s\u1ed1 n\u1eb1m trong d\u1ea3i nghe \u0111\u01b0\u1ee3c. K\u1ebft qu\u1ea3 l\u00e0 ch\u00fang ta nghe \u0111\u01b0\u1ee3c \u00e2m thanh t\u1eadp trung theo h\u01b0\u1edbng c\u1ee7a s\u00f3ng si\u00eau \u00e2m.<\/p>\n

Linh ki\u1ec7n c\u1ea7n thi\u1ebft<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Linh ki\u1ec7n<\/th>\nM\u00f4 t\u1ea3<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
B\u1ed9 ph\u00e1t si\u00eau \u00e2m<\/td>\nT\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng 40kHz l\u00e0 l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn<\/td>\n1<\/td>\n<\/tr>\n
B\u1ed9 khu\u1ebfch \u0111\u1ea1i \u00e2m thanh<\/td>\n\u0110\u1ec3 khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u \u00e2m thanh \u0111\u1ea7u v\u00e0o<\/td>\n1<\/td>\n<\/tr>\n
B\u1ed9 t\u1ea1o s\u00f3ng<\/td>\n\u0110\u1ec3 t\u1ea1o s\u00f3ng mang si\u00eau \u00e2m<\/td>\n1<\/td>\n<\/tr>\n
Loa si\u00eau \u00e2m<\/td>\nLo\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t s\u00f3ng \u1edf t\u1ea7n s\u1ed1 cao<\/td>\n1<\/td>\n<\/tr>\n
Ngu\u1ed3n \u0111i\u1ec7n<\/td>\nPh\u00f9 h\u1ee3p v\u1edbi c\u00e1c linh ki\u1ec7n<\/td>\n1<\/td>\n<\/tr>\n
\u0110i\u1ec7n tr\u1edf, t\u1ee5 \u0111i\u1ec7n, d\u00e2y n\u1ed1i<\/td>\nC\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed c\u01a1 b\u1ea3n<\/td>\nT\u00f9y theo m\u1ea1ch<\/td>\n<\/tr>\n
M\u1ea1ch in<\/td>\n\u0110\u1ec3 g\u1eafn c\u00e1c linh ki\u1ec7n<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n<\/h3>\n
    \n
  1. Thi\u1ebft k\u1ebf m\u1ea1ch:<\/strong> T\u00ecm ki\u1ebfm v\u00e0 l\u1ef1a ch\u1ecdn m\u1ed9t m\u1ea1ch \u0111i\u1ec7n ph\u00f9 h\u1ee3p cho loa tham s\u1ed1. C\u00f3 nhi\u1ec1u m\u1ea1ch \u0111i\u1ec7n c\u00f3 s\u1eb5n tr\u00ean internet. H\u00e3y ch\u1eafc ch\u1eafn b\u1ea1n hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ea1ch tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u.<\/li>\n
  2. L\u1eafp r\u00e1p linh ki\u1ec7n:<\/strong> C\u1ea9n th\u1eadn h\u00e0n c\u00e1c linh ki\u1ec7n l\u00ean m\u1ea1ch in theo \u0111\u00fang s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n. L\u01b0u \u00fd c\u1ef1c t\u00ednh c\u1ee7a c\u00e1c linh ki\u1ec7n nh\u01b0 t\u1ee5 \u0111i\u1ec7n v\u00e0 diode.<\/li>\n
  3. Ki\u1ec3m tra m\u1ea1ch:<\/strong> Sau khi l\u1eafp r\u00e1p, ki\u1ec3m tra k\u1ef9 l\u1ea1i c\u00e1c m\u1ed1i h\u00e0n v\u00e0 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 l\u1ed7i.<\/li>\n
  4. K\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n:<\/strong> K\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n v\u00e0o m\u1ea1ch. H\u00e3y c\u1ea9n th\u1eadn v\u00e0 \u0111\u1ea3m b\u1ea3o ngu\u1ed3n \u0111i\u1ec7n ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c linh ki\u1ec7n.<\/li>\n
  5. Ki\u1ec3m tra \u00e2m thanh:<\/strong> K\u1ebft n\u1ed1i ngu\u1ed3n \u00e2m thanh v\u00e0o m\u1ea1ch v\u00e0 ki\u1ec3m tra \u00e2m thanh \u0111\u1ea7u ra. B\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh c\u00e1c th\u00f4ng s\u1ed1 \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u00e2m thanh t\u1ed1t nh\u1ea5t.<\/li>\n<\/ol>\n

    Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1<\/h3>\n

    M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng g\u1eb7p bao g\u1ed3m \u00e2m thanh b\u1ecb m\u00e9o, \u00e2m l\u01b0\u1ee3ng qu\u00e1 nh\u1ecf, ho\u1eb7c kh\u00f4ng c\u00f3 \u00e2m thanh. Ki\u1ec3m tra l\u1ea1i c\u00e1c m\u1ed1i h\u00e0n, ngu\u1ed3n \u0111i\u1ec7n, v\u00e0 c\u00e1c linh ki\u1ec7n \u0111\u1ec3 t\u00ecm ra nguy\u00ean nh\u00e2n.<\/p>\n

    \u1ee8ng d\u1ee5ng c\u1ee7a loa tham s\u1ed1<\/h3>\n

    Loa tham s\u1ed1 c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb, t\u1eeb vi\u1ec7c t\u1ea1o ra c\u00e1c v\u00f9ng nghe c\u00e1 nh\u00e2n \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng trong b\u1ea3o t\u00e0ng v\u00e0 tri\u1ec3n l\u00e3m \u0111\u1ec3 cung c\u1ea5p th\u00f4ng tin h\u01b0\u1edbng d\u1eabn t\u1ea1i m\u1ed9t v\u1ecb tr\u00ed c\u1ee5 th\u1ec3 m\u00e0 kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nh\u1eefng khu v\u1ef1c xung quanh.<\/p>\n

    Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t loa tham s\u1ed1 \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c v\u1ec1 \u0111i\u1ec7n t\u1eed v\u00e0 s\u1ef1 ki\u00ean nh\u1eabn. Tuy nhi\u00ean, th\u00e0nh qu\u1ea3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ebd r\u1ea5t \u0111\u00e1ng gi\u00e1 khi b\u1ea1n c\u00f3 th\u1ec3 tr\u1ea3i nghi\u1ec7m c\u00f4ng ngh\u1ec7 \u00e2m thanh \u0111\u1ed9c \u0111\u00e1o n\u00e0y. Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 cung c\u1ea5p cho b\u1ea1n nh\u1eefng th\u00f4ng tin h\u1eefu \u00edch \u0111\u1ec3 b\u1eaft \u0111\u1ea7u d\u1ef1 \u00e1n c\u1ee7a m\u00ecnh.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Loa tham s\u1ed1, hay c\u00f2n g\u1ecdi l\u00e0 loa si\u00eau \u00e2m, l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 \u00e2m thanh h\u01b0\u1edbng t\u00ednh, cho ph\u00e9p t\u1eadp trung \u00e2m thanh v\u00e0o m\u1ed9t khu v\u1ef1c h\u1eb9p, gi\u1ed1ng nh\u01b0 m\u1ed9t ch\u00f9m tia s\u00e1ng. \u0110i\u1ec1u n\u00e0y kh\u00e1c bi\u1ec7t ho\u00e0n to\u00e0n so v\u1edbi loa truy\u1ec1n th\u1ed1ng, n\u01a1i \u00e2m thanh lan t\u1ecfa theo m\u1ecdi h\u01b0\u1edbng. Vi\u1ec7c<\/p>\n","protected":false},"author":1,"featured_media":26477,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-52076","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\/52076","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=52076"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/52076\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26477"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=52076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=52076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=52076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}