{"id":11289,"date":"2021-11-23T20:39:08","date_gmt":"2021-11-23T13:39:08","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=11289"},"modified":"2021-11-23T21:13:14","modified_gmt":"2021-11-23T14:13:14","slug":"ta%cc%a3i-sao-may-ghi-am-co-the%cc%89-ghi-duo%cc%a3c-am-thanh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/ta%cc%a3i-sao-may-ghi-am-co-the%cc%89-ghi-duo%cc%a3c-am-thanh\/","title":{"rendered":"Ta\u0323i sao ma\u0301y ghi \u00e2m co\u0301 th\u00ea\u0309 ghi \u0111\u01b0\u01a1\u0323c \u00e2m thanh?"},"content":{"rendered":"\n<p>Ma\u0301y ghi \u00e2m la\u0300 m\u00f4\u0323t trong nh\u01b0\u0303ng c\u00f4ng cu\u0323 h\u01b0\u0303u i\u0301ch kh\u00f4ng th\u00ea\u0309 thi\u00ea\u0301u. No\u0301 se\u0303 giu\u0301p chu\u0301ng ta ghi la\u0323i \u0111\u01b0\u01a1\u0323c nh\u01b0\u0303ng \u00e2m thanh c\u00e2\u0300n thi\u00ea\u0301t \u0111\u0103\u0323c bi\u00ea\u0323t trong vi\u00ea\u0323c in sao b\u0103ng casset. \u0110\u00f4\u0300ng th\u01a1\u0300i no\u0301 cu\u0303ng la\u0300 c\u00f4ng cu\u0323 quan tro\u0323ng cu\u0309a nh\u01b0\u0303ng ng\u01b0\u01a1\u0300i hoa\u0323t \u0111\u00f4\u0323ng trong li\u0303nh v\u01b0\u0323c \u00e2m nha\u0323c, pho\u0301ng vi\u00ean, nha\u0300 ba\u0301o\u2026 b\u01a1\u0309i vi\u0300 no\u0301 co\u0301 hai ch\u01b0\u0301c n\u0103ng c\u01a1 ba\u0309n \u0111o\u0301 la\u0300 ghi \u00e2m va\u0300 pha\u0301t \u00e2m. V\u00e2\u0323y ma\u0301y ghi \u00e2m ghi va\u0300 pha\u0301t ra \u00e2m thanh nh\u01b0 th\u00ea\u0301 na\u0300o?<\/p>\n\n\n\n<p>Chu\u0301ng ta \u0111\u00ea\u0300u bi\u00ea\u0301t, khi du\u0300ng nam ch\u00e2m \u0111\u00ea\u0309 hu\u0301t m\u00f4\u0323t chi\u00ea\u0301c \u0111inh s\u0103\u0301t, sau \u0111o\u0301 cho chi\u00ea\u0301c \u0111inh na\u0300y cha\u0323m va\u0300o m\u00f4\u0323t chi\u00ea\u0301c nan hoa xe \u0111a\u0323p, ba\u0323n se\u0303 th\u00e2\u0301y chi\u00ea\u0301c \u0111inh s\u0103\u0301t hu\u0301t chi\u00ea\u0301c nan hoa, vi\u0300 chi\u00ea\u0301c \u0111inh s\u0103\u0301t nho\u0309 \u0111a\u0303 bi\u0323 t\u01b0\u0300 hoa\u0301. Nam ch\u00e2m co\u0301 t\u01b0\u0300 ti\u0301nh ma\u0323nh, thi\u0300 t\u01b0\u0300 ti\u0301nh cu\u0309a chi\u00ea\u0301c \u0111inh di\u0301nh va\u0300o nam ch\u00e2m ca\u0300ng ma\u0323nh, s\u01b0\u0301c hu\u0301t chi\u00ea\u0301c nan hoa ca\u0300ng l\u01a1\u0301n, n\u00ea\u0301u ng\u01b0\u01a1\u0323c la\u0323i thi\u0300 se\u0303 ca\u0300ng y\u00ea\u0301u.<\/p>\n\n\n\n<p>Vi\u00ea\u0323c ghi \u00e2m cu\u0309a ma\u0301y ghi \u00e2m cu\u0303ng hoa\u0323t \u0111\u00f4\u0323ng theo nguy\u00ean li\u0301 t\u01b0\u01a1ng t\u01b0\u0323. Ghi \u00e2m kh\u00f4ng pha\u0309i la\u0300 s\u01b0\u0309 du\u0323ng t\u01b0\u0300 tr\u01b0\u01a1\u0300ng cu\u0309a nam ch\u00e2m vi\u0303nh c\u01b0\u0309u, ma\u0300 s\u01b0\u0309 du\u0323ng m\u00f4\u0323t chi\u00ea\u0301c nam ch\u00e2m \u0111i\u00ea\u0323n go\u0323i la\u0300 \u0111\u00e2\u0300u t\u01b0\u0300. \u0110\u00e2y la\u0300 m\u00f4\u0323t cu\u0323c s\u0103\u0301t nho\u0309 hi\u0300nh vo\u0300ng co\u0301 khe nho\u0309, phi\u0301a tr\u00ean co\u0301 cu\u00f4\u0301n m\u00f4\u0323t cu\u00f4\u0323n d\u00e2y. Khi ma\u0301y ghi \u00e2m hoa\u0323t \u0111\u00f4\u0323ng, ca\u0301c \u00e2m thanh \u0111\u01b0\u01a1\u0323c thu va\u0300o b\u01a1\u0309i micr\u00f4. Ca\u0301c ti\u0301n hi\u00ea\u0323u \u00e2m thanh na\u0300y \u0111\u01b0\u01a1\u0323c chuy\u00ea\u0309n tha\u0300nh ti\u0301n hi\u00ea\u0323u \u0111i\u00ea\u0323n truy\u00ea\u0300n qua b\u00f4\u0323 ph\u00e2\u0323n khu\u00ea\u0301ch \u0111a\u0323i cu\u0309a ma\u0301y ghi \u00e2m, sau \u0111o\u0301 cha\u0323y va\u0300o cu\u00f4\u0323n d\u00e2y cu\u0309a \u0111\u00e2\u0300u t\u01b0\u0300 sinh ra t\u01b0\u0300 tr\u01b0\u01a1\u0300ng, t\u01b0\u0300 tr\u01b0\u01a1\u0300ng na\u0300y thay \u0111\u00f4\u0309i theo s\u01b0\u0323 thay \u0111\u00f4\u0309i cu\u0309a t\u00e2\u0300n s\u00f4\u0301 \u00e2m thanh. Khi b\u0103ng t\u01b0\u0300 cha\u0323y qua khe phi\u0301a tr\u00ean cu\u0309a \u0111\u00e2\u0300u t\u01b0\u0300, t\u01b0\u0300 tr\u01b0\u01a1\u0300ng thay \u0111\u00f4\u0309i se\u0303 t\u01b0\u0300 ho\u0301a b\u0103ng t\u01b0\u0300, la\u0300m cho b\u0103ng t\u01b0\u0300 ghi la\u0323i \u0111\u01b0\u01a1\u0323c nh\u01b0\u0303ng ti\u0301n hi\u00ea\u0323u t\u01b0\u0300 t\u01b0\u01a1ng \u01b0\u0301ng v\u01a1\u0301i ca\u0301c ti\u0301n hi\u00ea\u0323u \u00e2m thanh, sau \u0111o\u0301 chuy\u00ea\u0309n v\u00ea\u0300 ch\u00ea\u0301 \u0111\u00f4\u0323 pha\u0301t thanh, ti\u0301n hi\u00ea\u0323u \u00e2m thanh tr\u00ean b\u0103ng t\u01b0\u0300 se\u0303 \u0111\u01b0\u01a1\u0323c ma\u0301y pha\u0301t \u00e2m khu\u00ea\u0301ch \u0111a\u0323i va\u0300 pha\u0301t ra \u00e2m thanh.<\/p>\n\n\n\n<p>Ngoa\u0300i ra ba\u0323n co\u0300n co\u0301 th\u00ea\u0309 xoa\u0301 \u00e2m thanh b\u0103\u0300ng \u0111\u00e2\u0300u t\u01b0\u0300 xoa\u0301 \u00e2m. \u0110\u00e2\u0300u t\u01b0\u0300 xoa\u0301 \u00e2m t\u01b0\u01a1ng t\u01b0\u0323 nh\u01b0 \u0111\u00e2\u0300u t\u01b0\u0300 ghi \u00e2m, nh\u01b0ng \u0111\u00e2\u0300u t\u01b0\u0300 xoa\u0301 \u00e2m co\u0301 khe h\u01a1\u0309 r\u00f4\u0323ng h\u01a1n va\u0300 co\u0301 th\u00ea\u0309 sinh ra t\u01b0\u0300 tr\u01b0\u01a1\u0300ng l\u01a1\u0301n h\u01a1n. Khi b\u0103ng t\u01b0\u0300 \u0111a\u0303 \u0111\u01b0\u01a1\u0323c ghi \u00e2m cha\u0323y qua khe cu\u0309a \u0111\u00e2\u0300u t\u01b0\u0300 xoa\u0301 \u00e2m, se\u0303 bi\u0323 t\u01b0\u0300 hoa\u0301 b\u01a1\u0309i t\u01b0\u0300 tr\u01b0\u01a1\u0300ng do \u0111\u00e2\u0300u t\u01b0\u0300 xo\u0301a sinh ra, no\u0301 se\u0303 \u0111\u00e2\u0309y t\u01b0\u0300 ti\u0301nh tr\u00ean b\u0103ng t\u01b0\u0300 ra va\u0300 xo\u0301a nh\u01b0\u0303ng th\u00f4ng tin \u00e2m thanh tr\u00ean b\u0103ng t\u01b0\u0300.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ma\u0301y ghi \u00e2m la\u0300 m\u00f4\u0323t trong nh\u01b0\u0303ng c\u00f4ng cu\u0323 h\u01b0\u0303u i\u0301ch kh\u00f4ng th\u00ea\u0309 thi\u00ea\u0301u. No\u0301 se\u0303 giu\u0301p chu\u0301ng ta ghi la\u0323i \u0111\u01b0\u01a1\u0323c nh\u01b0\u0303ng \u00e2m thanh c\u00e2\u0300n thi\u00ea\u0301t \u0111\u0103\u0323c bi\u00ea\u0323t trong vi\u00ea\u0323c in sao b\u0103ng casset. \u0110\u00f4\u0300ng th\u01a1\u0300i no\u0301 cu\u0303ng la\u0300 c\u00f4ng cu\u0323 quan tro\u0323ng cu\u0309a nh\u01b0\u0303ng ng\u01b0\u01a1\u0300i hoa\u0323t \u0111\u00f4\u0323ng trong li\u0303nh v\u01b0\u0323c \u00e2m nha\u0323c, pho\u0301ng [&hellip;]<\/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":[1,15],"tags":[],"class_list":["post-11289","post","type-post","status-publish","format-standard","hentry","category-general","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11289","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=11289"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11289\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=11289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=11289"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=11289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}