Tr\u01b0\u01a1\u0301c \u0111\u00e2y ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh ma\u0300 ba\u0323n xem, chu\u0309 y\u00ea\u0301u la\u0300 v\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh (truy\u00ea\u0300n hi\u0300nh kh\u00f4ng d\u00e2y), truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh. Nh\u01b0ng m\u00f4\u0323t va\u0300i n\u0103m tr\u01a1\u0309 la\u0323i \u0111\u00e2y ba\u0323n co\u0300n nghe ng\u01b0\u01a1\u0300i ta nh\u0103\u0301c nhi\u00ea\u0300u \u0111\u00ea\u0301n kha\u0301i ni\u00ea\u0323m “truy\u00ea\u0300n hi\u0300nh ca\u0301p” hay truy\u00ea\u0300n hi\u0300nh h\u01b0\u0303u tuy\u00ea\u0301n, v\u00e2\u0323y truy\u00ea\u0300n hi\u0300nh ca\u0301p la\u0300 gi\u0300?<\/p>\n\n\n\n
\u0110\u00ea\u0309 hi\u00ea\u0309u v\u00ea\u0300 truy\u00ea\u0300n hi\u0300nh ca\u0301p, tr\u01b0\u01a1\u0301c h\u00ea\u0301t chu\u0301ng ta pha\u0309i hi\u00ea\u0309u nguy\u00ean li\u0301 hoa\u0323t \u0111\u00f4\u0323ng cu\u0309a v\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh. V\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh hoa\u0323t \u0111\u00f4\u0323ng theo nguy\u00ean li\u0301: \u0111a\u0300i truy\u00ea\u0300n hi\u0300nh ma\u0303 hoa\u0301 ca\u0301c ti\u0301n hi\u00ea\u0323u \u00e2m thanh va\u0300 hi\u0300nh a\u0309nh d\u01b0\u01a1\u0301i da\u0323ng ti\u0301n hi\u00ea\u0323u \u0111i\u00ea\u0323n va\u0300 pha\u0301t l\u00ean kh\u00f4ng trung, ca\u0301c \u0103ngten tivi cu\u0309a ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh b\u0103\u0301t ti\u0301n hi\u00ea\u0323u \u0111i\u00ea\u0323n \u0111o\u0301 va\u0300 chuy\u00ea\u0309n va\u0300o tivi, b\u00f4\u0323 vi x\u01b0\u0309 ly\u0301 ti\u0301n hi\u00ea\u0323u \u0111i\u00ea\u0323n trong tivi se\u0303 gia\u0309i ma\u0303 ti\u0301n hi\u00ea\u0323u \u0111i\u00ea\u0323n \u0111o\u0301, ta\u0301i ta\u0323o la\u0323i \u00e2m thanh va\u0300 hi\u0300nh a\u0309nh sau \u0111o\u0301 b\u0103\u0301n hi\u0300nh a\u0309nh l\u00ean ma\u0300n hi\u0300nh va\u0300 pha\u0301t \u00e2m thanh ra loa cu\u0309a tivi. Qua\u0301 tri\u0300nh truy\u00ea\u0300n pha\u0301t ti\u0301n hi\u00ea\u0323u cu\u0309a \u0111a\u0300i pha\u0301t kh\u00f4ng du\u0300ng \u0111\u01b0\u01a1\u0300ng d\u00e2y truy\u00ea\u0300n ti\u0301n hi\u00ea\u0323u, do \u0111o\u0301 no\u0301 \u0111\u01b0\u01a1\u0323c go\u0323i la\u0300 “v\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh” hay “truy\u00ea\u0300n hi\u0300nh kh\u00f4ng d\u00e2y”.<\/p>\n\n\n\n
Truy\u00ea\u0300n hi\u0300nh ca\u0301p thi\u0300 ng\u01b0\u01a1\u0323c la\u0323i, no\u0301 hoa\u0323t \u0111\u00f4\u0323ng theo nguy\u00ean li\u0301 truy\u00ea\u0300n ti\u0301n hi\u00ea\u0323u b\u0103\u0300ng d\u00e2y ca\u0301p truy\u00ea\u0300n hi\u0300nh. C\u00f4ng ngh\u00ea\u0323 na\u0300y co\u0300n \u0111\u01b0\u01a1\u0323c \u01b0\u0301ng du\u0323ng r\u00f4\u0323ng ra\u0303i trong ca\u0301c li\u0303nh v\u01b0\u0323c nh\u01b0: c\u00f4ng nghi\u00ea\u0323p, khoa ho\u0323c c\u00f4ng ngh\u00ea\u0323, giao th\u00f4ng\u2026 \u0111em la\u0323i r\u00e2\u0301t nhi\u00ea\u0300u ti\u00ea\u0323n i\u0301ch cho c\u00f4ng vi\u00ea\u0323c va\u0300 cu\u00f4\u0323c s\u00f4\u0301ng cu\u0309a con ng\u01b0\u01a1\u0300i. Truy\u00ea\u0300n hi\u0300nh ca\u0301p la\u0300m cho khoa\u0309ng ca\u0301ch gi\u01b0\u0303a \u0111a\u0300i truy\u00ea\u0300n hi\u0300nh va\u0300 tivi cu\u0309a ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh gi\u00f4\u0301ng nh\u01b0 khoa\u0309ng ca\u0301ch gi\u01b0\u0303a t\u00f4\u0309ng \u0111a\u0300i \u0111i\u00ea\u0323n thoa\u0323i v\u01a1\u0301i ma\u0301y \u0111i\u00ea\u0323n thoa\u0323i cu\u0309a ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh, hi\u0300nh tha\u0300nh m\u00f4\u0323t ma\u0323ng l\u01b0\u01a1\u0301i truy\u00ea\u0300n hi\u0300nh ca\u0301p. Ca\u0301c \u0111\u00e2\u0300u ca\u0301p truy\u00ea\u0300n hi\u0300nh \u0111\u01b0\u01a1\u0323c \u0111\u01b0a t\u01a1\u0301i t\u01b0\u0300ng h\u00f4\u0323 gia \u0111i\u0300nh va\u0300 \u0111\u01b0\u01a1\u0323c n\u00f4\u0301i v\u01a1\u0301i m\u00f4\u0323t thi\u00ea\u0301t bi\u0323 khu\u00ea\u0301ch \u0111a\u0323i ti\u0301n hi\u00ea\u0323u truy\u00ea\u0300n hi\u0300nh, thi\u00ea\u0301t bi\u0323 na\u0300y \u0111\u01b0\u01a1\u0323c n\u00f4\u0301i v\u01a1\u0301i tivi. Truy\u00ea\u0300n hi\u0300nh ca\u0301p ti\u00ea\u0323n i\u0301ch h\u01a1n v\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh \u01a1\u0309 ch\u00f4\u0303, ti\u0301n hi\u00ea\u0323u truy\u00ea\u0300n hi\u0300nh kh\u00f4ng bi\u0323 ca\u0309n tr\u01a1\u0309 b\u01a1\u0309i \u0111i\u0323a hi\u0300nh r\u01b0\u0300ng nu\u0301i ho\u0103\u0323c ca\u0301c to\u0300a nha\u0300 cao t\u00e2\u0300ng; kh\u00f4ng chi\u0323u a\u0309nh h\u01b0\u01a1\u0309ng cu\u0309a th\u01a1\u0300i ti\u00ea\u0301t cu\u0303ng nh\u01b0 ca\u0301c loa\u0323i so\u0301ng \u0111i\u00ea\u0323n t\u01b0\u0300 kha\u0301c, kha\u0309 n\u0103ng ch\u00f4\u0301ng nhi\u00ea\u0303u cu\u0309a truy\u00ea\u0300n hi\u0300nh ca\u0301p la\u0300 r\u00e2\u0301t l\u01a1\u0301n, ch\u00e2\u0301t l\u01b0\u01a1\u0323ng \u00e2m thanh va\u0300 hi\u0300nh a\u0309nh t\u00f4\u0301t, h\u01a1n n\u01b0\u0303a kh\u00f4ng bi\u0323 ch\u00e2\u0323p cha\u0301y tivi khi co\u0301 s\u00e2\u0301m se\u0301t, b\u01a1\u0309i vi\u0300 truy\u00ea\u0300n hi\u0300nh ca\u0301p kh\u00f4ng du\u0300ng \u0103ngten ma\u0300 truy\u00ea\u0300n ti\u0301n hi\u00ea\u0323u qua \u0111\u01b0\u01a1\u0300ng d\u00e2y.<\/p>\n\n\n\n
Truy\u00ea\u0300n hi\u0300nh ca\u0301p co\u0301 nhi\u00ea\u0300u \u01b0u vi\u00ea\u0323t nh\u01b0 th\u00ea\u0301 n\u00ean hi\u00ea\u0323n nay nga\u0300y ca\u0300ng co\u0301 nhi\u00ea\u0300u h\u00f4\u0323 gia \u0111i\u0300nh s\u01b0\u0309 du\u0323ng truy\u00ea\u0300n hi\u0300nh ca\u0301p. \u01a0\u0309 ca\u0301c n\u01b0\u01a1\u0301c pha\u0301t tri\u00ea\u0309n ph\u01b0\u01a1ng T\u00e2y, ty\u0309 l\u00ea\u0323 ph\u00f4\u0309 bi\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh ca\u0301p la\u0300 80-90%. Hi\u00ea\u0323n nay do \u0111i\u00ea\u0300u ki\u00ea\u0323n thu nh\u00e2\u0323p bi\u0300nh qu\u00e2n \u0111\u00e2\u0300u ng\u01b0\u01a1\u0300i n\u01b0\u01a1\u0301c ta co\u0300n th\u00e2\u0301p, n\u00ean vi\u00ea\u0323c ph\u00f4\u0309 c\u00e2\u0323p truy\u00ea\u0300n hi\u0300nh ca\u0301p cu\u0309a n\u01b0\u01a1\u0301c ta co\u0300n ha\u0323n ch\u00ea\u0301, ca\u0301c \u0111\u00e2\u0300u m\u00f4\u0301i ca\u0301p truy\u00ea\u0300n hi\u0300nh ch\u01b0a \u0111\u01b0\u01a1\u0323c \u0111\u01b0a \u0111\u00ea\u0301n ca\u0301c h\u00f4\u0323 d\u00e2n tr\u00ean pha\u0323m vi r\u00f4\u0323ng, ma\u0300 chu\u0309 y\u00ea\u0301u t\u00e2\u0323p trung ta\u0323i ca\u0301c tha\u0300nh ph\u00f4\u0301 l\u01a1\u0301n va\u0300 ca\u0301c khu \u0111\u00f4 thi\u0323 pha\u0301t tri\u00ea\u0309n. Tuy nhi\u00ean, cu\u0300ng v\u01a1\u0301i \u0111\u01a1\u0300i s\u00f4\u0301ng nh\u00e2n d\u00e2n \u0111\u01b0\u01a1\u0323c n\u00e2ng cao, nga\u0300nh truy\u00ea\u0300n hi\u0300nh cu\u0309a n\u01b0\u01a1\u0301c ta \u0111ang n\u00f4\u0303 l\u01b0\u0323c \u0111\u00e2\u0309y ma\u0323nh pha\u0301t tri\u00ea\u0309n truy\u00ea\u0300n hi\u0300nh ca\u0301p. Trong t\u01b0\u01a1ng lai, truy\u00ea\u0300n hi\u0300nh ca\u0301p se\u0303 nga\u0300y ca\u0300ng ph\u00f4\u0309 bi\u00ea\u0301n r\u00f4\u0323ng ra\u0303i tr\u00ean pha\u0323m vi ca\u0309 n\u01b0\u01a1\u0301c.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tr\u01b0\u01a1\u0301c \u0111\u00e2y ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh ma\u0300 ba\u0323n xem, chu\u0309 y\u00ea\u0301u la\u0300 v\u00f4 tuy\u00ea\u0301n truy\u00ea\u0300n hi\u0300nh (truy\u00ea\u0300n hi\u0300nh kh\u00f4ng d\u00e2y), truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh. Nh\u01b0ng m\u00f4\u0323t va\u0300i n\u0103m tr\u01a1\u0309 la\u0323i \u0111\u00e2y ba\u0323n co\u0300n nghe ng\u01b0\u01a1\u0300i ta nh\u0103\u0301c nhi\u00ea\u0300u \u0111\u00ea\u0301n kha\u0301i ni\u00ea\u0323m “truy\u00ea\u0300n hi\u0300nh ca\u0301p” hay truy\u00ea\u0300n hi\u0300nh h\u01b0\u0303u tuy\u00ea\u0301n, v\u00e2\u0323y truy\u00ea\u0300n hi\u0300nh ca\u0301p la\u0300 […]<\/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-11274","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\/11274","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=11274"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11274\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=11274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=11274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=11274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}