{"id":51652,"date":"2023-04-21T13:35:44","date_gmt":"2023-04-21T18:35:44","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/diy-ultrasonic-directional-speaker\/"},"modified":"2025-01-21T07:09:48","modified_gmt":"2025-01-21T12:09:48","slug":"diy-ultrasonic-directional-speaker","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/diy-ultrasonic-directional-speaker\/","title":{"rendered":"T\u1ef1 ch\u1ebf loa si\u00eau \u00e2m \u0111\u1ecbnh h\u01b0\u1edbng \u0111\u01a1n gi\u1ea3n"},"content":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb v\u00e0 \u0111\u1ea7y th\u1eed th\u00e1ch, cho ph\u00e9p b\u1ea1n kh\u00e1m ph\u00e1 l\u0129nh v\u1ef1c \u00e2m thanh theo m\u1ed9t c\u00e1ch \u0111\u1ed9c \u0111\u00e1o. Loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch ph\u00e1t ra s\u00f3ng \u00e2m \u1edf t\u1ea7n s\u1ed1 cao v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi. Nh\u1eefng s\u00f3ng \u00e2m n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u bi\u1ebfn \u0111\u1ec3 t\u1ea1o ra \u00e2m thanh nghe \u0111\u01b0\u1ee3c trong m\u1ed9t khu v\u1ef1c h\u1eb9p, gi\u1ed1ng nh\u01b0 m\u1ed9t &quot;ch\u00f9m&quot; \u00e2m thanh. \u0110i\u1ec1u n\u00e0y kh\u00e1c v\u1edbi loa th\u00f4ng th\u01b0\u1eddng, ph\u00e1t ra \u00e2m thanh lan t\u1ecfa theo m\u1ecdi h\u01b0\u1edbng.<\/p>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m<\/h3>\n<p>Loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m d\u1ef1a tr\u00ean nguy\u00ean l\u00fd bi\u1ebfn \u0111i\u1ec7u bi\u00ean \u0111\u1ed9 v\u00e0 hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh c\u1ee7a kh\u00f4ng kh\u00ed.  T\u00edn hi\u1ec7u \u00e2m thanh mong mu\u1ed1n \u0111\u01b0\u1ee3c \u0111i\u1ec1u bi\u1ebfn l\u00ean s\u00f3ng mang si\u00eau \u00e2m c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n nhi\u1ec1u. Khi s\u00f3ng mang n\u00e0y 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 th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 m\u1edbi, bao g\u1ed3m c\u1ea3 t\u1ea7n s\u1ed1 \u00e2m thanh ban \u0111\u1ea7u. K\u1ebft qu\u1ea3 l\u00e0 ta nghe \u0111\u01b0\u1ee3c \u00e2m thanh t\u1eeb v\u00f9ng kh\u00f4ng kh\u00ed m\u00e0 s\u00f3ng si\u00eau \u00e2m t\u1eadp trung v\u00e0o.<\/p>\n<h3>C\u00e1c linh ki\u1ec7n c\u1ea7n thi\u1ebft<\/h3>\n<p>\u0110\u1ec3 ch\u1ebf t\u1ea1o m\u1ed9t loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY, b\u1ea1n s\u1ebd c\u1ea7n c\u00e1c linh ki\u1ec7n sau:<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Linh ki\u1ec7n<\/th>\n<th>M\u00f4 t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>B\u1ed9 ph\u00e1t si\u00eau \u00e2m<\/td>\n<td>T\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 khu\u1ebfch \u0111\u1ea1i<\/td>\n<td>Khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u \u00e2m thanh v\u00e0 si\u00eau \u00e2m.<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 \u0111i\u1ec1u bi\u1ebfn<\/td>\n<td>\u0110i\u1ec1u bi\u1ebfn t\u00edn hi\u1ec7u \u00e2m thanh l\u00ean s\u00f3ng mang si\u00eau \u00e2m.<\/td>\n<\/tr>\n<tr>\n<td>Ngu\u1ed3n \u0111i\u1ec7n<\/td>\n<td>Cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho to\u00e0n b\u1ed9 m\u1ea1ch.<\/td>\n<\/tr>\n<tr>\n<td>Loa th\u01b0\u1eddng (t\u00f9y ch\u1ecdn)<\/td>\n<td>\u0110\u1ec3 so s\u00e1nh v\u1edbi loa \u0111\u1ecbnh h\u01b0\u1edbng.<\/td>\n<\/tr>\n<tr>\n<td>V\u1ecf loa<\/td>\n<td>\u0110\u1ec3 ch\u1ee9a c\u00e1c linh ki\u1ec7n v\u00e0 t\u1ea1o h\u00ecnh d\u1ea1ng cho loa.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Quy tr\u00ecnh l\u1eafp r\u00e1p<\/h3>\n<p>Vi\u1ec7c l\u1eafp r\u00e1p loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c v\u1ec1 \u0111i\u1ec7n t\u1eed v\u00e0 h\u00e0n m\u1ea1ch.  B\u1ea1n c\u1ea7n k\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n theo s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf.  Vi\u1ec7c l\u1ef1a ch\u1ecdn t\u1ea7n s\u1ed1 si\u00eau \u00e2m v\u00e0 thi\u1ebft k\u1ebf m\u1ea1ch \u0111i\u1ec1u bi\u1ebfn l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 \u0111\u1ecbnh h\u01b0\u1edbng t\u1ed1t.  N\u1ebfu c\u1ea7n thi\u1ebft, c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn ho\u1eb7c b\u1ed9 kit DIY c\u00f3 s\u1eb5n tr\u00ean th\u1ecb tr\u01b0\u1eddng.<\/p>\n<h3>Kh\u00f3 kh\u0103n v\u00e0 l\u01b0u \u00fd<\/h3>\n<p>Ch\u1ebf t\u1ea1o loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY c\u00f3 th\u1ec3 g\u1eb7p m\u1ed9t s\u1ed1 kh\u00f3 kh\u0103n, v\u00ed d\u1ee5 nh\u01b0 vi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ed9 ph\u00e1t si\u00eau \u00e2m ph\u00f9 h\u1ee3p v\u00e0 \u0111i\u1ec1u ch\u1ec9nh m\u1ea1ch \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 \u0111\u1ecbnh h\u01b0\u1edbng mong mu\u1ed1n.  C\u1ea7n l\u01b0u \u00fd r\u1eb1ng hi\u1ec7u qu\u1ea3 \u0111\u1ecbnh h\u01b0\u1edbng c\u1ee7a loa si\u00eau \u00e2m c\u0169ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi m\u00f4i tr\u01b0\u1eddng xung quanh.  C\u00e1c v\u1eadt c\u1ea3n c\u00f3 th\u1ec3 l\u00e0m ph\u00e2n t\u00e1n s\u00f3ng \u00e2m v\u00e0 gi\u1ea3m hi\u1ec7u qu\u1ea3 \u0111\u1ecbnh h\u01b0\u1edbng.<\/p>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m<\/h3>\n<p>Loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng ti\u1ec1m n\u0103ng, bao g\u1ed3m:<\/p>\n<ul>\n<li>H\u1ec7 th\u1ed1ng \u00e2m thanh c\u00e1 nh\u00e2n:  Cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng nghe nh\u1ea1c m\u00e0 kh\u00f4ng l\u00e0m phi\u1ec1n ng\u01b0\u1eddi kh\u00e1c.<\/li>\n<li>Tri\u1ec3n l\u00e3m b\u1ea3o t\u00e0ng: Cung c\u1ea5p th\u00f4ng tin \u00e2m thanh cho t\u1eebng hi\u1ec7n v\u1eadt c\u1ee5 th\u1ec3.<\/li>\n<li>Qu\u1ea3ng c\u00e1o m\u1ee5c ti\u00eau:  H\u01b0\u1edbng \u00e2m thanh \u0111\u1ebfn m\u1ed9t nh\u00f3m kh\u00e1ch h\u00e0ng c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY l\u00e0 m\u1ed9t d\u1ef1 \u00e1n \u0111\u1ea7y th\u00e1ch th\u1ee9c nh\u01b0ng c\u0169ng r\u1ea5t b\u1ed5 \u00edch.  N\u00f3 kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u00e2m thanh m\u00e0 c\u00f2n cho ph\u00e9p b\u1ea1n t\u1ea1o ra m\u1ed9t thi\u1ebft b\u1ecb \u00e2m thanh \u0111\u1ed9c \u0111\u00e1o v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng ti\u1ec1m n\u0103ng.  Tuy nhi\u00ean, c\u1ea7n chu\u1ea9n b\u1ecb ki\u1ebfn th\u1ee9c v\u00e0 k\u1ef9 n\u0103ng c\u1ea7n thi\u1ebft tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u d\u1ef1 \u00e1n n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m DIY l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb v\u00e0 \u0111\u1ea7y th\u1eed th\u00e1ch, cho ph\u00e9p b\u1ea1n kh\u00e1m ph\u00e1 l\u0129nh v\u1ef1c \u00e2m thanh theo m\u1ed9t c\u00e1ch \u0111\u1ed9c \u0111\u00e1o. Loa \u0111\u1ecbnh h\u01b0\u1edbng si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch ph\u00e1t ra s\u00f3ng \u00e2m \u1edf t\u1ea7n s\u1ed1 cao v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe<\/p>\n","protected":false},"author":1,"featured_media":26478,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-51652","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\/51652","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=51652"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/51652\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26478"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=51652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=51652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=51652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}