{"id":4741,"date":"2016-01-25T16:02:21","date_gmt":"2016-01-25T09:02:21","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=4741"},"modified":"2017-10-02T11:27:23","modified_gmt":"2017-10-02T04:27:23","slug":"phan-mem-hien-thi-song-am-duoi-dang-hinh-anh-tuong-tac-ho-tro-len-day-nhac-cu-sang-tac-nhac","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/phan-mem-hien-thi-song-am-duoi-dang-hinh-anh-tuong-tac-ho-tro-len-day-nhac-cu-sang-tac-nhac\/","title":{"rendered":"Ph\u1ea7n m\u1ec1m hi\u1ec3n th\u1ecb s\u00f3ng \u00e2m d\u01b0\u1edbi d\u1ea1ng h\u00ecnh \u1ea3nh t\u01b0\u01a1ng t\u00e1c, h\u1ed7 tr\u1ee3 l\u00ean d\u00e2y nh\u1ea1c c\u1ee5, s\u00e1ng t\u00e1c nh\u1ea1c,…"},"content":{"rendered":"

M\u1ed9t \u1ee9ng d\u1ee5ng ph\u00e2n t\u00edch v\u00e0 h\u00ecnh \u1ea3nh h\u00f3a \u00e2m thanh v\u1eeba \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n th\u00e0nh c\u00f4ng b\u1edfi c\u00e1c nh\u00e0 khoa h\u1ecdc Ph\u00e1p, cho ph\u00e9p kh\u00f4ng ch\u1ec9 c\u00e1c nh\u1ea1c s\u0129 chuy\u00ean nghi\u1ec7p m\u00e0 c\u1ea3 nh\u1eefng ng\u01b0\u1eddi nghi\u1ec7p d\u01b0 c\u0169ng c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111i\u1ec1u ch\u1ec9nh ch\u00ednh x\u00e1c nh\u1ea1c c\u1ee5, s\u00e1ng t\u1ea1o ra c\u00e1c giai \u0111i\u1ec7u, th\u1eadm ch\u00ed l\u00e0 t\u1ea1o n\u00ean m\u1ed9t t\u00e1c ph\u1ea9m ngh\u1ec7 thu\u1eadt \u0111\u1ed3ng b\u1ed9 gi\u1eefa \u00e2m nh\u1ea1c v\u00e0 h\u00ecnh \u1ea3nh theo th\u1eddi gian th\u1ef1c – m\u1ed9t s\u1ef1 k\u1ebft h\u1ee3p tuy\u1ec7t v\u1eddi gi\u1eefa ngh\u1ec7 thu\u1eadt v\u00e0 khoa h\u1ecdc c\u00f4ng ngh\u1ec7.<\/strong><\/p>\n

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Nh\u01b0 ta \u0111\u00e3 bi\u1ebft th\u00ec \u00e2m thanh l\u00e0 rung \u0111\u1ed9ng \u00e2m h\u1ecdc trong kh\u00f4ng kh\u00ed. Rung \u0111\u1ed9ng, ho\u1eb7c t\u00edn hi\u1ec7u n\u00e0y, bao g\u1ed3m nhi\u1ec1u dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 v\u00e0 t\u1ea5n s\u1ed1 kh\u00e1c nhau, h\u1ee3p th\u00e0nh n\u00ean m\u1ed9t d\u1ea1ng ” ph\u1ed5 \u00e2m thanh”. M\u1ed9t thi\u1ebft b\u1ecb ph\u00e2n t\u00edch ph\u1ed5 \u00e2m thanh s\u1ebd v\u1ebd ra \u0111\u1ed3 th\u1ecb bi\u00ean \u0111\u1ed9 t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng \u00e2m thanh, \u0111\u1ed3ng th\u1eddi cho bi\u1ebft t\u1ea7n s\u1ed1, s\u1ed1 l\u1ea7n dao \u0111\u1ed9ng m\u1ed7i gi\u00e2y. \u0110\u1ed1i v\u1edbi m\u1ed9t m\u00e1y ph\u00e2n t\u00edch s\u00f3ng \u00e2m ti\u00eau chu\u1ea9n th\u00ec c\u00e1c \u0111\u1ed3 th\u1ecb n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch t\u00edn hi\u1ec7u.<\/p>\n

C\u00e1c m\u00e1y ph\u00e2n t\u00edch n\u00e0y s\u1ebd tr\u00edch xu\u1ea5t bi\u00ean \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a \u00e2m thanh, cung c\u1ea5p th\u00f4ng tin v\u1ec1 nh\u1eefng dao \u0111\u1ed9ng t\u1ea1o n\u00ean \u00e2m thanh. Th\u00ed d\u1ee5 nh\u01b0 \u0111\u1ed1i v\u1edbi m\u1ed9t t\u00edn hi\u1ec7u \u00e2m thanh v\u1edbi t\u1ea7n s\u1ed1 l\u00e0 440Hz, khi t\u00edn hi\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c x\u1eed l\u00fd trong m\u1ed9t chu k\u1ef3 ng\u1eafn th\u00ec s\u1ebd \u0111\u1ea1t ng\u01b0\u1ee1ng n\u0103ng l\u01b0\u1ee3ng t\u1ea1i 440 Hz. Nh\u01b0ng n\u1ebfu chu k\u1ef3 ph\u00e2n t\u00edch c\u00e0ng ng\u1eafn th\u00ec ng\u01b0\u1ee1ng n\u00e0y c\u00e0ng r\u1ed9ng v\u00e0 c\u00e0ng k\u00e9m ch\u00ednh x\u00e1c. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y g\u1ecdi l\u00e0 “s\u1ef1 kh\u00f4ng ch\u1eafc c\u1ee7a t\u1ea7n s\u1ed1 – th\u1eddi gian”.<\/p>\n

\u0110\u1ec3 gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a t\u1ea7n s\u1ed1, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u01b0a ra m\u1ed9t ch\u1ec9 s\u1ed1 m\u1edbi \u0111\u1ec3 ph\u00e2n \u0111\u1ecbnh \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a \u00e2m thanh g\u1ecdi l\u00e0 “chu k\u1ef3 tr\u00edch t\u00e1ch” (demodulated phase). \u0110\u00e2y l\u00e0 m\u1ed9t h\u1eb1ng theo th\u1eddi gian v\u00e0 n\u00f3 cung c\u1ea5p th\u00f4ng tin v\u1ec1 cung c\u1ea5p th\u00f4ng tin v\u1ec1 s\u1ef1 \u0111\u1ed3ng b\u1ed9 h\u00f3a gi\u1eefa m\u1ed9t th\u00e0nh ph\u1ea7n trong \u00e2m thanh g\u1ed1c v\u00e0 m\u1ed7i t\u1ea7n s\u1ed1 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch ra. Thi\u1ebft b\u1ecb ph\u00e2n t\u00edch n\u00e0y ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u00f4 s\u1ed1 chi\u1ebfc m\u00e1y t\u1ea7n k\u1ebf, s\u1eed d\u1ee5ng m\u1ed9t thu\u1eadt to\u00e1n c\u1ee5 th\u1ec3 \u0111\u1ec3 t\u1ea1o ra v\u00f4 s\u1ed1 chu k\u1ef3 ph\u00e2n t\u00edch c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a \u00e2m thanh t\u1ea1i m\u1ed9t t\u1ea7n s\u1ed1 c\u1ee5 th\u1ec3.
\nD\u1ef1a theo nguy\u00ean t\u1eafc “tr\u00edch t\u00e1ch” n\u00f3i tr\u00ean, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ph\u00e1t tri\u1ec3n ra m\u1ed9t thu\u1eadt to\u00e1n gi\u00fap ph\u00e2n t\u00edch t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a ph\u1ed5 \u00e2m thanh v\u00e0 hi\u1ec3n th\u1ecb n\u00f3 th\u00e0nh nh\u1eefng h\u00ecnh \u1ea3nh ch\u1ee9a th\u00f4ng tin tr\u1ef1c quan. V\u1edbi t\u00ean g\u1ecdi SnailAnalyser-Tune, gi\u1ea3i ph\u00e1p n\u00e0y bao g\u1ed3m “Snail Mode” – bi\u1ec3u th\u1ecb v\u00f9ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a quang ph\u1ed5 \u00e2m thanh b\u1eb1ng m\u1ed9t \u0111i\u1ec3m s\u00e1ng tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng xo\u1eafn \u1ed1c t\u01b0\u01a1ng \u1ee9ng v\u1edbi 1 qu\u00e3ng t\u00e1m, c\u00e1c n\u1ed1t c\u00e0ng th\u1ea5p s\u1ebd c\u00e0ng \u1edf g\u1ea7n trung t\u00e2m c\u1ee7a xo\u1eafn \u1ed1c v\u00e0 c\u00e0ng xa th\u00ec n\u1ed1t s\u1ebd c\u00e0ng cao. 1 v\u00f2ng xo\u1eafn t\u01b0\u01a1ng \u1ee9ng v\u1edbi 1 qu\u00e3ng t\u00e1m.<\/p>\n

Giao di\u1ec7n c\u1ee7a \u1ee9ng d\u1ee5ng SnailAnalyser-Tune\u200b<\/em><\/p>\n

T\u1ea7n s\u1ed1 c\u1ee7a \u00e2m thoa (m\u1eb7c \u0111\u1ecbnh l\u00e0 440 Hz) s\u1ebd \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u b\u1eb1ng 1 ch\u1ea5m tr\u00ean v\u00f2ng xo\u1eafn. C\u1ee9 m\u1ed7i l\u1ea7n ph\u00e2n t\u00edch t\u1ea7n s\u1ed1, bi\u00ean \u0111\u1ed9 s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh \u00e2m l\u01b0\u1ee3ng (m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u1ea1i di\u1ec7n cho m\u1ee9c \u0111\u1ed9 l\u1edbn nh\u1ecf c\u1ee7a \u00e2m thanh m\u00e0 con ng\u01b0\u1eddi c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c) v\u00e0 khi \u0111\u00f3, n\u00f3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u0111\u1ed9 s\u00e1ng c\u1ee7a ch\u1ea5m, n\u1ebfu \u00e2m thanh l\u1edbn g\u1ea5p \u0111\u00f4i th\u00ec ch\u1ea5m s\u1ebd s\u00e1ng h\u01a1n g\u1ea5p \u0111\u00f4i. M\u1eb7t kh\u00e1c, \u0111\u1ed9 l\u1edbn c\u1ee7a ch\u1ea5m tr\u00ean v\u00f2ng xo\u1eafn c\u0169ng \u0111\u1ea1i di\u1ec7n cho \u0111\u1ed9 nhi\u1ec5u v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ed3ng b\u1ed9 v\u1edbi pha tr\u00edch t\u00e1ch. Khi \u0111\u00f3, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 m\u1ecbn c\u1ee7a ch\u1ea5m n\u00e0y \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 \u00e2m thanh ho\u1eb7c h\u00ecnh \u1ea3nh mong mu\u1ed1n. B\u00ean c\u1ea1nh \u0111\u00f3, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u0169ng s\u1eed d\u1ee5ng m\u00e0u s\u1eafc \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1eb7c t\u00ednh kh\u00e1c c\u1ee7a \u00e2m thanh.<\/p>\n

Ngo\u00e0i ra, ch\u00fang ta c\u00f2n c\u00f3 th\u00eam 2 ch\u1ebf \u0111\u1ed9 kh\u00e1c, “Spectrogram mode” hi\u1ec3n th\u1ecb c\u00e1c v\u00f9ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u00e2m thanh tr\u00ean ph\u00edm \u0111\u00e0n theo d\u00f2ng th\u1eddi gian, v\u00e0 “tuner mode” cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng quan s\u00e1t c\u1ea5u t\u1ea1o c\u1ee7a m\u1ed9t n\u1ed1t c\u1ee5 th\u1ec3. B\u1eb1ng c\u00e1ch t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u1ed1t nh\u1ea1c \u1edf ch\u1ebf \u0111\u1ed9 “tuner mode” ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 quan s\u00e1t qu\u00e1 tr\u00ecnh xoay c\u1ee7a n\u1ed1t nh\u1ea1c \u0111\u1ec3 \u01b0\u1edbc t\u00ednh \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng \u0111i\u1ec1u ch\u1ec9nh, th\u00ed d\u1ee5 nh\u01b0 xoay 1 v\u00f2ng 2 gi\u00e2y t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi khi\u1ec3m khuy\u1ebft \u0111i\u1ec1u ch\u1ec9nh l\u00e0 0,5 Hz.<\/p>\n

V\u1edbi ph\u1ea7n m\u1ec1m SnailAnalyser-Tuner, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ch\u00ednh x\u00e1c trong ph\u00e2n t\u00edch b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh n\u00f3 b\u1eb1ng nh\u1eefng h\u00ecnh \u1ea3nh tr\u1ef1c quan. M\u1eb7t kh\u00e1c, ph\u1ea7n m\u1ec1m n\u00e0y c\u00f2n \u0111\u1eb7c bi\u1ec7t h\u1eefu d\u1ee5ng khi ph\u00e2n t\u00edch, tr\u00edch xu\u1ea5t c\u00e1c th\u00e0nh ph\u1ea7n kh\u00f4ng mong mu\u1ed1n trong m\u00f4i tr\u01b0\u1eddng thu \u00e2m (ti\u1ebfng \u1ed3n, ti\u1ebfng n\u00f3i chuy\u1ec7n,…), \u0111\u1ed3ng th\u1eddi t\u1ea1o \u0111i\u1ec1u ki\u1ec7n \u0111i\u1ec1u ch\u1ec9nh nh\u1ea1c c\u1ee5, c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c \u0111\u00e0n l\u00ean d\u00e2y \u0111\u00e3 chu\u1ea9n ch\u01b0a, ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng d\u00e2y \u0111\u00e0n,…<\/p>\n

Ph\u1ea7n m\u1ec1m c\u00f2n cung c\u1ea5p gi\u1ea3i ph\u00e1p m\u1edbi \u0111\u1ec3 h\u00ecnh \u1ea3nh h\u00f3a ph\u1ed5 \u00e2m thanh, gi\u00fap c\u00e1c nh\u1ea1c s\u0129 d\u1ec5 n\u1eafm b\u1eaft h\u01a1n v\u00e0 cung c\u1ea5p c\u00f4ng c\u1ee5 \u0111i\u1ec1u ch\u1ec9nh v\u1edb \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ef1c cao, t\u1eeb \u0111\u00f3 cho ph\u00e9p h\u1ecd “ch\u1ea1m” v\u00e0o th\u1ebf gi\u1edbi c\u1ee7a \u00e2m thanh v\u00e0 t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u00f3. \u1ee8ng d\u1ee5ng \u0111ang \u0111\u01b0\u1ee3c cung c\u1ea5p v\u1edbi 2 phi\u00ean b\u1ea3n PC v\u00e0 MAC, c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam n\u1ebfu quan t\u00e2m. Phi\u00ean b\u1ea3n d\u00e0nh cho iOS s\u1ebd \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u v\u00e0o th\u00e1ng 6 s\u1eafp t\u1edbi.<\/p>\n

Tham kh\u1ea3o CNRS, ScienceDaily, Ircam<\/strong>\u200b<\/em><\/p>\n

Ngu\u1ed3n tinhte.vn<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

M\u1ed9t \u1ee9ng d\u1ee5ng ph\u00e2n t\u00edch v\u00e0 h\u00ecnh \u1ea3nh h\u00f3a \u00e2m thanh v\u1eeba \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n th\u00e0nh c\u00f4ng b\u1edfi c\u00e1c nh\u00e0 khoa h\u1ecdc Ph\u00e1p, cho ph\u00e9p kh\u00f4ng ch\u1ec9 c\u00e1c nh\u1ea1c s\u0129 chuy\u00ean nghi\u1ec7p m\u00e0 c\u1ea3 nh\u1eefng ng\u01b0\u1eddi nghi\u1ec7p d\u01b0 c\u0169ng c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111i\u1ec1u ch\u1ec9nh ch\u00ednh x\u00e1c nh\u1ea1c c\u1ee5, s\u00e1ng t\u1ea1o ra c\u00e1c giai \u0111i\u1ec7u, […]<\/p>\n","protected":false},"author":17,"featured_media":5260,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-4741","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4741","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=4741"}],"version-history":[{"count":2,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4741\/revisions"}],"predecessor-version":[{"id":5261,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4741\/revisions\/5261"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/5260"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=4741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=4741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=4741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}