T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 5 – Arkady Leokum<\/p>\n\n\n\n
Ng\u00e0y nay h\u1ea7u nh\u01b0 kh\u00f4ng ai c\u00f2n xa l\u1ea1 v\u1edbi m\u00e1y cassette, \u0111\u1ebfn n\u1ed7i nhi\u1ec1u ng\u01b0\u1eddi kh\u1ed1n kh\u1ed5 v\u00ec b\u1ecb m\u00e1y cassette \u201ch\u00e0nh h\u1ea1\u201d t\u1ed1i ng\u00e0y. Nhi\u1ec1u ng\u01b0\u1eddi ng\u00e0y nay kh\u00f4ng m\u01b0\u1eddng t\u01b0\u1ee3ng n\u1ed5i c\u00e1i m\u00e1y quay d\u0129a c\u1ee7a v\u00e0 ba ch\u1ee5c n\u0103m v\u1ec1 tr\u01b0\u1edbc, nh\u1ea5t l\u00e0 m\u00e1y quay d\u0129a th\u1eddi Thomas Edison m\u1edbi s\u00e1ng ch\u1ebf. Tuy nhi\u00ean nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a m\u00e1y quay d\u0129a th\u1eddi Edison c\u0169ng v\u1eabn kh\u00f4ng thay \u0111\u1ed5i trong m\u00e1y cassette.<\/p>\n\n\n\n
Ta \u0111\u00e3 bi\u1ebft \u00e2m thanh d\u00f9 l\u00e0 ti\u1ebfng n\u00f3i hay do c\u00e1c nh\u1ea1c kh\u00ed – \u0111\u1ec1u ch\u1ec9 l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a s\u1ef1 dao \u0111\u1ed9ng kh\u00f4ng kh\u00ed. \u0111\u1ec3 \u201ct\u00e1i l\u1eadp\u201d \u00e2m thanh, ta ph\u1ea3i thu l\u1ea1i \u0111\u01b0\u1ee3c nh\u1eefng \u201cdao \u0111\u1ed9ng\u201d \u0111\u00f3. Ta h\u00e3y n\u00f3i s\u1ef1 dao \u0111\u1ed9ng kh\u00f4ng kh\u00ed \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1eeb m\u1ed9t c\u00e1i \u201ckh\u1ea9u k\u00e8n\u201d (mouthpiece of a tube). \u1ede ph\u00eda \u0111\u1ea7u kia c\u1ee7a c\u00e2y k\u00e8n c\u00f3 m\u1ed9t c\u00e1i d\u0129a v\u00e0 m\u1ed9t d\u1ee5ng c\u1ee5 \u0111\u1ec3 kh\u1eafc (c\u00e1i m\u0169i kim ch\u1eb3ng h\u1ea1n). Khi dao \u0111\u1ed9ng chuy\u1ec3n qua \u1ed1ng (l\u00f2ng k\u00e8n), chi\u1ebfc d\u0129a rung l\u00ean v\u00e0 d\u1ee5ng c\u1ee5 \u0111\u1ec3 kh\u1eafc kia c\u0169ng rung theo. C\u00f9ng l\u00fac \u0111\u00f3, \u1edf ph\u00eda \u0111\u1ea7u kia c\u1ee7a d\u1ee5ng c\u1ee5 kh\u1eafc c\u00f3 m\u1ed9t \u0111\u0129a m\u1ec1m kh\u00e1c ph\u1ee7 s\u00e1p ong ch\u1eb3ng h\u1ea1n chuy\u1ec3n \u0111\u1ed9ng v\u00f2ng quanh sao cho d\u1ee5ng c\u1ee5 kh\u1eafc xoay v\u00f2ng xo\u00e1y tr\u00f4n \u1ed1c tr\u00ean d\u0129a s\u00e1p. Khi chi\u1ebfc \u0111\u0129a \u1edf ph\u00eda loa k\u00e8n rung l\u00ean, d\u1ee5ng c\u1ee5 kh\u1eafc rung theo v\u00e0 v\u1ea1ch nh\u1eefng \u0111\u01b0\u1eddng rung \u0111\u00f3 tr\u00ean \u0111\u0129a s\u00e1p theo \u0111\u01b0\u1eddng xo\u00e1y tr\u00f4n \u1ed1c. V\u1eady l\u00e0 ta \u0111\u00e3 ghi l\u1ea1i \u0111\u01b0\u1ee3c s\u1ef1 dao \u0111\u1ed9ng c\u1ee7a kh\u00f4ng kh\u00ed do \u201ckh\u1ea9u k\u00e8n\u201d t\u1ea1o ra.<\/p>\n\n\n\n
B\u00e2y gi\u1edd ta cho c\u00e2y kim ch\u1ea1y theo nh\u1eefng \u0111\u01b0\u1eddng dao \u0111\u1ed9ng \u0111\u00e3 \u0111\u01b0\u1ee3c ghi l\u1ea1i. C\u00e2y kim b\u1ecb rung l\u00ean theo nh\u1eefng \u0111\u01b0\u1eddng rung \u0111\u00e3 \u0111\u01b0\u1ee3c ghi l\u1ea1i tr\u00ean \u0111\u0129a v\u00e0 l\u00e0m cho kh\u00f4ng kh\u00ed b\u1ecb rung l\u00ean theo. Thu l\u1ea1i s\u1ef1 rung n\u00e0y trong kh\u00f4ng kh\u00ed, ta \u201cph\u1ee5c h\u1ed3i\u201d l\u1ea1i, l\u1eb7p l\u1ea1i s\u1ef1 dao \u0111\u1ed9ng c\u1ee7a kh\u00f4ng kh\u00ed do kh\u1ea9u k\u00e8n t\u1ea1o ra l\u00fac tr\u01b0\u1edbc. Th\u1ebf l\u00e0 ta \u0111\u00e3 \u201cph\u1ee5c h\u1ed3i\u201d l\u1ea1i \u00e2m thanh c\u00e2y k\u00e8n.<\/p>\n\n\n\n
T\u1ea5t nhi\u00ean \u0111\u00e2y ch\u1ec9 l\u00e0 n\u00eau l\u00ean nguy\u00ean t\u1eafc v\u1eadn h\u00e0nh c\u1ee7a m\u00e1y ghi \u00e2m v\u00e0 \u201ct\u00e1i l\u1eadp\u201d \u00e2m, k\u1ef9 thu\u1eadt s\u1ebd g\u00f3p ph\u1ea7n \u0111\u1ec3 th\u1ec3 hi\u1ec7n th\u1ef1c nguy\u00ean t\u1eafc r\u1ea5t \u0111\u01a1n gi\u1ea3n \u1ea5y. V\u00e0 c\u0169ng t\u1ea5t nhi\u00ean m\u00e1y thu b\u0103ng v\u00e0 cassette ng\u00e0y nay r\u1ea5t t\u00e2n k\u1ef3. Ch\u1eb3ng h\u1ea1n, \u00e2m ba thay v\u00ec \u0111\u01b0\u1ee3c ghi l\u1ea1i tr\u00ean \u0111\u0129a th\u00ec n\u00f3 \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh d\u00f2ng \u0111i\u1ec7n. S\u1ef1 \u201cd\u1eadp d\u00ecnh\u201d c\u1ee7a \u00e2m ba \u0111\u01b0\u1ee3c bi\u1ebfn th\u00e0nh s\u1ef1 \u201cd\u1eadp d\u00ecnh\u201d c\u1ee7a d\u00f2ng \u0111i\u1ec7n. V\u00e0 d\u00f2ng \u0111i\u1ec7n n\u00e0y \u0111\u01b0\u1ee3c ph\u00f3ng \u0111\u1ea1i v\u00e0 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o b\u0103ng t\u1eeb \u0111\u1ec3 cho c\u00e1c d\u1ee5ng c\u1ee5 ghi l\u1ea1i.<\/p>\n\n\n\n
V\u1eadn h\u00e0nh c\u1ee7a m\u00e1y cassette \u0111\u1ea1i kh\u00e1i l\u00e0 \u201cm\u00f3c\u201d \u00e2m thanh t\u1eeb b\u0103ng ra m\u1ed9t c\u00e2y kim. C\u00e2y kim n\u00e0y nh\u1ea5n tr\u00ean mi\u1ebfng th\u1ea1ch anh \u0111\u1eb7t \u1edf b\u1ed9 ph\u1eadn g\u1ecdi l\u00e0 \u201cc\u00e1nh tay m\u00f3c \u00e2m\u201d. Mi\u1ebfng th\u1ea1ch anh g\u00e2y ra m\u1ed9t d\u00f2ng \u0111i\u1ec7n xung \u0111\u1ed9ng theo s\u1ef1 rung c\u1ee7a c\u00e2y kim. Xung \u0111\u1ed9ng \u0111i\u1ec7n n\u00e0y \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 \u0111\u1ea9y lui \u0111\u1ea7u kim nh\u1ecdn trong loa t\u1ea1o ra dao \u0111\u1ed9ng m\u00e0ng loa. Th\u1ebf l\u00e0 ta l\u1ea1i \u201ct\u00e1i hi\u1ec7n\u201d \u00e2m thanh.<\/p>\n","protected":false},"excerpt":{"rendered":"
T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 5 – Arkady Leokum Ng\u00e0y nay h\u1ea7u nh\u01b0 kh\u00f4ng ai c\u00f2n xa l\u1ea1 v\u1edbi m\u00e1y cassette, \u0111\u1ebfn n\u1ed7i nhi\u1ec1u ng\u01b0\u1eddi kh\u1ed1n kh\u1ed5 v\u00ec b\u1ecb m\u00e1y cassette \u201ch\u00e0nh h\u1ea1\u201d t\u1ed1i ng\u00e0y. Nhi\u1ec1u ng\u01b0\u1eddi ng\u00e0y nay kh\u00f4ng m\u01b0\u1eddng t\u01b0\u1ee3ng n\u1ed5i c\u00e1i m\u00e1y quay d\u0129a c\u1ee7a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15],"tags":[],"class_list":["post-14604","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/14604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=14604"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/14604\/revisions"}],"predecessor-version":[{"id":14605,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/14604\/revisions\/14605"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=14604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=14604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=14604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}