\u0110i\u1ec7n \u1ea3nh t\u1eeb c\u00e2m \u0111\u1ebfn c\u00f3 ti\u1ebfng. Th\u1eddi k\u1ef3 \u0111\u1ea7u \u00e1p d\u1ee5ng \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01a1n. Ngh\u0129a l\u00e0 ghi \u00e2m t\u1ea1i m\u1ed9t v\u1ecb tr\u00ed c\u1ee7a tr\u01b0\u1eddng quay. Khi chi\u1ebfu ra t\u1ea1i r\u1ea1p phim th\u00ec d\u00f9ng \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01a1n \u0111\u1ec3 ho\u00e0n \u00e2m. Ch\u1ec9 ph\u00e1t \u00e2m thanh t\u1eeb m\u1ed9t v\u1ecb tr\u00ed, ho\u1eb7c ph\u00e1t ra c\u00f9ng m\u1ed9t \u00e2m thanh t\u1ea1i c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau b\u1eb1ng m\u1ea5y m\u00e1y ph\u00f3ng thanh. \u00c2m thanh \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01a1n (mono) tuy c\u0169ng r\u1ea5t vui tai, nh\u01b0ng kh\u00f4ng c\u00f3 c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 (n\u1ed5i: stereo), khi\u1ebfn ng\u01b0\u1eddi nghe th\u1ea5y kh\u00f4ng t\u1ef1 nhi\u00ean, kh\u00f4ng th\u1eadt. V\u00e0o gi\u1eefa th\u1eadp ni\u00ean 30 c\u1ee7a th\u1ebf k\u1ec9 XX \u0111\u00e3 xu\u1ea5t hi\u1ec7n \u0111i\u1ec7n \u1ea3nh l\u1eadp th\u1ec3. \u00c2m thanh l\u1eadp th\u1ec3 ngo\u00e0i bi\u1ebfn \u0111\u1ed5i \u00e2m \u0111i\u1ec7u \u00e2m s\u1eafc v\u00e0 thay \u0111\u1ed5i m\u1ea1nh y\u1ebfu nh\u01b0 mono ra, c\u00f2n c\u00f3 c\u1ea3m gi\u00e1c ph\u01b0\u01a1ng v\u1ecb, c\u1ea3m gi\u00e1c v\u1ec1 chi\u1ec1u r\u1ed9ng v\u00e0 \u0111\u1ed9 s\u00e2u, khi\u1ebfn ta nh\u01b0 \u1edf v\u00e0o trong c\u1ea3nh.<\/p>\n\n\n\n
\u0110i\u1ec7n \u1ea3nh t\u1eeb phim 35mm, 50mm, phim to\u00e0n c\u1ea3nh, phim m\u00e0n \u1ea3nh r\u1ed9ng, phim 70mm, ph\u00e1t tri\u1ec3n t\u1edbi phim \u0111\u1ed9 n\u00e9t cao v\u00e0 phim m\u00e0n \u1ea3nh c\u1ef1c l\u1edbn m\u00e0n \u1ea3nh v\u00f2m, m\u00e0n \u1ea3nh c\u1ea7u. C\u00f9ng v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n \u0111\u00f3, \u00e2m thanh l\u1eadp th\u1ec3 c\u1ee7a phim \u1ea3nh c\u0169ng \u0111\u00e3 c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 thay \u0111\u1ed5i r\u1ea5t l\u1edbn, s\u1ed1 l\u01b0\u1ee3ng \u0111\u01b0\u1eddng \u00e2m t\u1eeb hai \u0111\u01b0\u1eddng ph\u00e1t tri\u1ec3n l\u00ean 4, 6, 8 \u0111\u01b0\u1eddng (\u0111\u1eb7c bi\u1ec7t c\u00f3 7, 9, 10, 11 \u0111\u01b0\u1eddng).<\/p>\n\n\n\n
Phim l\u1eadp th\u1ec3 b\u1ed1n \u0111\u01b0\u1eddng ti\u1ebfng 35 mm d\u00f9ng ph\u1ed5 bi\u1ebfn b\u0103ng l\u1eadp th\u1ec3 quang h\u1ecdc c\u00f3 thi\u1ebft b\u1ecb h\u1ea1 ti\u1ebfng \u1ed3n. V\u1ec7t ghi \u00e2m c\u1ee7a n\u00f3 c\u00f3 hai v\u1ec7t \u00e2m. T\u00edn hi\u1ec7u ghi tr\u00ean \u0111\u00f3 bao g\u1ed3m b\u1ed1n \u0111\u01b0\u1eddng ti\u1ebfng tr\u00e1i, gi\u1eefa, ph\u1ea3i v\u00e0 ti\u1ebfng m\u00f4i tr\u01b0\u1eddng. L\u00fac ghi, ghi s\u1ed1 cho b\u1ed1n \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u th\u00e0nh hai \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u. L\u00fac ho\u00e0n nguy\u00ean th\u00ec ph\u1ee5c h\u1ed3i hai \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u tr\u1edf l\u1ea1i b\u1ed1n \u0111\u01b0\u1eddng. Ta g\u1ecdi \u0111\u00f3 l\u00e0 ph\u01b0\u01a1ng th\u1ee9c \u00e2m thanh stereo 4 – 2 – 4. S\u1ef1 ph\u00e2n ph\u1ed1i b\u1ed1n \u0111\u01b0\u1eddng \u00e2m thanh stereo trong r\u1ea1p th\u00e0nh ba \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u tr\u00e1i, gi\u1eefa, ph\u1ea3i \u1edf ph\u00eda sau m\u00e0n \u1ea3nh. C\u00f2n m\u1ed9t \u0111\u01b0\u1eddng th\u00ec c\u1ea5p cho h\u1ec7 th\u1ed1ng m\u00e1y ph\u00f3ng thanh (loa: loudspeaker) \u0111\u1eb7t \u1edf hai b\u00ean t\u01b0\u1eddng v\u00e0 t\u01b0\u1eddng sau c\u1ee7a ph\u00f2ng kh\u00e1ch xem. Nh\u01b0 v\u1eady, s\u1ebd l\u00e0m cho m\u00f4i tr\u01b0\u1eddng xung quang c\u00f3 \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 \u00e2m h\u01b0\u1edfng t\u1ed1t.<\/p>\n\n\n\n
Trang h\u00ecnh c\u1ee7a phim 70mm r\u1ed9ng, \u0111\u1ed9 n\u00e9t cao v\u00e0 th\u01b0\u1eddng s\u1eed d\u1ee5ng \u00e2m thanh stereo s\u00e1u \u0111\u01b0\u1eddng. Trong \u0111\u00f3 \u1edf sau m\u00e0n \u1ea3nh s\u1ebd b\u1ed1 tr\u00ed n\u0103m \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u l\u00e0 tr\u00e1i, tr\u00e1i gi\u1eefa, gi\u1eefa, ph\u1ea3i gi\u1eefa v\u00e0 ph\u1ea3i c\u00f2n m\u1ed9t \u0111\u01b0\u1eddng \u00e2m thanh m\u00f4i tr\u01b0\u1eddng th\u00ec c\u0169ng b\u1ed1 tr\u00ed nh\u01b0 \u00e2m thanh stereo b\u1ed1n \u0111\u01b0\u1eddng ti\u1ebfng.<\/p>\n\n\n\n
Phim m\u00e0n \u1ea3nh c\u1ef1c l\u1edbn, m\u00e0n \u1ea3nh v\u00f2m v\u00e0 m\u00e0n \u1ea3nh c\u1ea7u \u0111\u1ec1u s\u1eed d\u1ee5ng \u00e2m thanh stereo s\u00e1u \u0111\u01b0\u1eddng ti\u1ebfng. C\u00f3 \u0111i\u1ec1u v\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t c\u00e1c \u0111\u01b0\u1eddng ti\u1ebfng kh\u00e1c v\u1edbi phim 70mm.<\/p>\n\n\n\n
Phim \u1ea3nh \u00e2m thanh stereo s\u1ed1 \u00e1p d\u1ee5ng b\u1ed1 tr\u00ed \u00e2m thanh stereo t\u00e1m \u0111\u01b0\u1eddng ti\u1ebfng s\u1ed1, \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng con chip m\u00e1y t\u00ednh chuy\u00ean d\u1ee5ng. N\u00f3 \u0111\u01b0\u1ee3c d\u00f9ng cho c\u00e1c r\u1ea1p chi\u1ebfu phim c\u1ee1 l\u1edbn ch\u1ee9a \u0111\u01b0\u1ee3c nhi\u1ec1u kh\u00e1n gi\u1ea3. Trong r\u1ea1p chi\u1ebfu, vi\u1ec7c b\u1ed1 tr\u00ed \u00e2m thanh l\u00e0: sau m\u00e0n \u1ea3nh \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t n\u0103m \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u tr\u00e1i, gi\u1eefa, tr\u00e1i gi\u1eefa, gi\u1eefa ph\u1ea3i v\u00e0 ph\u1ea3i. Tr\u00e1i, ph\u1ea3i l\u00e0 hai \u0111\u01b0\u1eddng \u00e2m thanh m\u00f4i tr\u01b0\u1eddng. B\u1ee9c t\u01b0\u1eddng sau r\u1ea1p c\u00f2n c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng \u00e2m thanh t\u1ea7n s\u1ed1 th\u1ee9 c\u1ea5p. T\u1ea5t c\u1ea3 l\u00e0 t\u00e1m \u0111\u01b0\u1eddng.<\/p>\n\n\n\n
N\u00f3i chung s\u1ed1 \u0111\u01b0\u1eddng truy\u1ec1n c\u00e0ng nhi\u1ec1u th\u00ec c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 (n\u1ed5i) c\u00e0ng r\u00f5. Th\u1ebf nh\u01b0ng hai c\u00e1i \u0111\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ec9 l\u1ec7 thu\u1eadn. Qua th\u1ef1c nghi\u1ec7m th\u00ec c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 c\u1ee7a m\u1ed9t \u0111\u01b0\u1eddng truy\u1ec1n (mono) l\u00e0 0, c\u1ee7a hai \u0111\u01b0\u1eddng l\u00e0 61%, ba \u0111\u01b0\u1eddng l\u00e0 84%, b\u1ed1n \u0111\u01b0\u1eddng l\u00e0 90%. S\u1ed1 \u0111\u01b0\u1eddng c\u00e0ng t\u0103ng n\u1eefa th\u00ec c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 c\u0169ng ch\u1ec9 t\u0103ng l\u00ean ch\u1eadm. Ch\u1ec9 khi s\u1ed1 \u0111\u01b0\u1eddng t\u0103ng l\u00ean v\u00f4 h\u1ea1n (th\u1ef1c t\u1ebf l\u00e0 kh\u00f4ng th\u1ec3) th\u00ec c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 m\u1edbi g\u1ea7n \u0111\u1ebfn 100%. B\u1edfi v\u1eady, c\u00e2n nh\u1eafc gi\u1eefa hai m\u1eb7t l\u00e0 c\u1ea3m gi\u00e1c l\u1eadp th\u1ec3 ch\u1ee7 quan v\u1edbi t\u00ednh kinh t\u1ebf c\u1ee7a thi\u1ebft b\u1ecb th\u00ec b\u1ed1n \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i h\u01a1n c\u1ea3.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: \u00c2m thanh l\u1eadp th\u1ec3 (stereo; n\u1ed5i); Ph\u00e2n ph\u1ed1i \u0111\u01b0\u1eddng ti\u1ebfng.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u0110i\u1ec7n \u1ea3nh t\u1eeb c\u00e2m \u0111\u1ebfn c\u00f3 ti\u1ebfng. Th\u1eddi k\u1ef3 \u0111\u1ea7u \u00e1p d\u1ee5ng \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01a1n. Ngh\u0129a l\u00e0 ghi \u00e2m t\u1ea1i m\u1ed9t v\u1ecb tr\u00ed c\u1ee7a tr\u01b0\u1eddng quay. Khi chi\u1ebfu ra t\u1ea1i r\u1ea1p phim th\u00ec d\u00f9ng \u0111\u01b0\u1eddng ti\u1ebfng \u0111\u01a1n \u0111\u1ec3 ho\u00e0n \u00e2m. Ch\u1ec9 ph\u00e1t \u00e2m thanh t\u1eeb m\u1ed9t v\u1ecb tr\u00ed, ho\u1eb7c ph\u00e1t ra c\u00f9ng m\u1ed9t \u00e2m thanh […]<\/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":[15,13],"tags":[],"class_list":["post-10396","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-tin-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10396","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=10396"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/10396\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=10396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=10396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=10396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}