{"id":3981,"date":"2014-07-25T09:03:07","date_gmt":"2014-07-25T02:03:07","guid":{"rendered":"http:\/\/snt.com.vn\/blog\/?p=3981"},"modified":"2014-07-25T09:03:07","modified_gmt":"2014-07-25T02:03:07","slug":"tri%e1%bb%83n-khai-truy%e1%bb%81n-hinh-3d-tren-cong-ngh%e1%bb%87-dvb-t2","status":"publish","type":"post","link":"https:\/\/snt.com.vn\/blog\/tri%e1%bb%83n-khai-truy%e1%bb%81n-hinh-3d-tren-cong-ngh%e1%bb%87-dvb-t2\/","title":{"rendered":"Tri\u1ec3n khai truy\u1ec1n h\u00ecnh 3D tr\u00ean c\u00f4ng ngh\u1ec7 DVB-T2"},"content":{"rendered":"

Trong b\u1ed1i c\u1ea3nh ng\u00e0y c\u00e0ng xu\u1ea5t hi\u1ec7n nhi\u1ec1u k\u00eanh truy\u1ec1n h\u00ecnh s\u1ed1 m\u1edbi v\u1edbi s\u1ef1 \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa v\u1ec1 n\u1ed9idung, th\u00ec c\u00e1c n\u1ed9i dung 3D \u0111ang nh\u1eadn \u0111\u01b0\u1ee3c ms\u1ef1 quan t\u00e2m \u0111\u1eb7c bi\u1ec7t c\u1ee7a ng\u01b0\u1eddi xem c\u1ed9ng h\u01b0\u1edfng v\u1edbi s\u1ed1 l\u01b0\u1ee3ng n\u1ed9i dung 3D c\u0169ng \u0111ang gia t\u0103ng theo h\u00e0mm\u0169. C\u00f9ng th\u1eddi \u0111i\u1ec3m n\u00e0y, th\u1ebf h\u1ec7 th\u1ee9 hai c\u1ee7a chu\u1ea9n truy\u1ec1n h\u00ecnh s\u1ed1 m\u1eb7t \u0111\u1ea5t l\u00e0 DVB-T2 \u0111ang \u0111\u01b0\u1ee3c tri\u1ec3n khai t\u1ea1i m\u1ed9t s\u1ed1 khu v\u1ef1c h\u01b0\u1edbng \u0111\u1ebfn gia t\u0103ng dung l\u01b0\u1ee3ng \u0111\u01b0\u1eddng truy\u1ec1n \u0111\u1ed3ng th\u1eddi t\u1ea1o ra c\u01a1 h\u1ed9i l\u1edbn cho c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 mu\u1ed1n cung c\u1ea5p th\u00eam c\u00e1c d\u1ecbch v\u1ee5 gia t\u0103ng k\u1ebft h\u1ee3p n\u1ed9i dung HDTV.<\/p>\n

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B\u00e0i vi\u1ebft n\u00e0y th\u1ec3 hi\u1ec7n nh\u1eadn \u0111\u1ecbnh v\u1ec1 t\u00ednh kh\u1ea3 thi c\u1ee7a vi\u1ec7c ph\u00e1t s\u00f3ng 3DTV tr\u00ean DVB-T2 [1]. Theo \u0111\u00f3, b\u00e0i vi\u1ebft s\u1ebd gi\u1edbi thi\u1ec7u s\u01a1 l\u01b0\u1ee3c v\u1ec1 c\u00e1c nguy\u00ean l\u00fd c\u01a1 b\u1ea3n, c\u00e1c xu h\u01b0\u1edbng th\u1ecb tr\u01b0\u1eddng, v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u c\u1ea7n thi\u1ebft \u0111\u1ec3 c\u00f3 th\u1ec3 cung c\u1ea5p \u0111\u01b0\u1ee3c n\u1ed9i dung 3DTV \u0111\u1ebfn nh\u00e0 ng\u01b0\u1eddi xem. Ngo\u00e0i ra, b\u00e0i vi\u1ebft c\u0169ng cung c\u1ea5p m\u1ed9t c\u1ea5u tr\u00fac chung \u0111\u1ec3 truy\u1ec1n d\u1eabn n\u1ed9i dung 3DTV tr\u00ean m\u1ea1ng ph\u00e1t s\u00f3ng DVB-T2.<\/em><\/p>\n

1. Kh\u00e1n gi\u1ea3 s\u1ebd s\u1edbm \u0111\u01b0\u1ee3c xem truy\u1ec1n h\u00ecnh 3D.<\/strong><\/p>\n

Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, k\u1ef9 thu\u1eadt stereoscopic TV (c\u00f2n g\u1ecdi l\u00e0 3DTV) \u0111\u00e3 c\u00f3 nh\u1eefng b\u01b0\u1edbc ph\u00e1t tri\u1ec3n v\u01b0\u1ee3t b\u1eadc trong c\u00e1c h\u1ec7 th\u1ed1ng r\u1ea1p phim v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3ng b\u00e1 s\u1ed1. Th\u1ef1c ra, n\u1ed9i dung 3D kh\u00f4ng m\u1edbi \u0111\u1ed1i v\u1edbi r\u1ea1p phim, khi m\u00e0 nh\u1eefng phim 3D \u0111\u1ea7u ti\u00ean \u0111\u00e3 xu\u1ea5t hi\u1ec7n t\u1eeb n\u0103m 1920 (v\u00ed d\u1ee5 phim \u201cthe Creature from the Black Lagoon\u201d c\u00f3 t\u1eeb n\u0103m 1950). Tuy nhi\u00ean, s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a k\u1ef9 thu\u1eadt s\u1ed1 \u0111\u00e3 th\u00fac \u0111\u1ea9y gia t\u0103ng \u0111\u1ebfn b\u00f9ng n\u1ed5 vi\u1ec7c s\u1ea3n xu\u1ea5t nhi\u1ec1u phim 3D (h\u01a1n 20 phim \u0111\u00e3 \u0111\u01b0\u1ee3c xu\u1ea5t b\u1ea3n ho\u1eb7c \u0111\u00e3 l\u00ean k\u1ebf ho\u1ea1ch xu\u1ea5t b\u1ea3n trong n\u0103m 2009 v\u00e0 2010). Trong n\u0103m 2010, s\u1ef1 th\u00e0nh c\u00f4ng c\u1ee7a phim \u201cAvatar\u201d (doanh thu 430 tri\u1ec7u \u0111\u00f4 la, v\u1edbi 78% \u0111\u1ebfn t\u1eeb m\u00e0n h\u00ecnh 3D) \u0111\u00e3 minh ch\u1ee9ng cho s\u1ee9c thu h\u00fat c\u1ee7a n\u1ed9i dung 3D \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi xem, v\u00e0 c\u0169ng cho th\u1ea5y ti\u1ec1m n\u0103ng ngu\u1ed3n thu \u0111\u00e1ng k\u1ec3 t\u1eeb k\u1ef9 thu\u1eadt n\u00e0y.<\/p>\n

Do \u0111\u00f3, nhi\u1ec1u \u0111\u1ed1i t\u00e1c trong h\u1ec7 th\u1ed1ng qu\u1ea3ng b\u00e1 s\u1ed1 \u0111\u00e3 quan t\u00e2m \u0111\u1ebfn vi\u1ec7c ph\u00e1t tri\u1ec3n n\u1ed9i dung 3DTV, c\u00e1c gi\u1ea3i ph\u00e1p truy\u1ec1n d\u1eabn c\u00f3 th\u1ec3 cho 3D, v\u00e0 d\u0129 nhi\u00ean l\u00e0 s\u1ef1 s\u1eb5n c\u00f3 c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m d\u00e2n d\u1ee5ng h\u1ed7 tr\u1ee3 3D (nh\u01b0: TV 3D-ready, m\u00e0n h\u00ecnh LCD, STB, thi\u1ebft b\u1ecb c\u1ea7m tay, m\u00e1y t\u00ednh,\u2026). V\u1edbi c\u00e1c nh\u00e0 \u0111i\u1ec1u h\u00e0nh PayTV, h\u1ecd \u0111ang xem x\u00e9t \u0111\u1ebfn s\u1ef1 ch\u1ea5p nh\u1eadn c\u00e1c d\u1ecbch v\u1ee5 3D c\u1ee7a kh\u00e1ch h\u00e0ng (d\u1ef1a tr\u00ean s\u1ef1 h\u00e0i l\u00f2ng khi tr\u1ea3i nghi\u1ec7m n\u1ed9i dung 3D) v\u00e0 lo\u1ea1i k\u1ef9 thu\u1eadt 3D c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t (\u0111\u1ea1t y\u00eau c\u1ea7u QoE \u2013 Quality Of Experience). Ngo\u00e0i ra, m\u1ed9t s\u1ed1 h\u00e3ng truy\u1ec1n h\u00ecnh nh\u01b0 BSkyB \u1edf Anh v\u00e0 DIRECTV \u1edf M\u1ef9 \u0111\u00e3 chu\u1ea9n b\u1ecb ph\u00e1t s\u00f3ng c\u00e1c d\u1ecbch v\u1ee5 3D tr\u00ean v\u1ec7 tinh, nh\u00e0 qu\u1ea3ng b\u00e1 v\u1ec7 tinh PayTV l\u00e0 Canal+ c\u0169ng d\u1ef1 ki\u1ebfn s\u1ebd tri\u1ec3n khai m\u1ed9t k\u00eanh 3D tr\u01b0\u1edbc Gi\u00e1ng Sinh n\u0103m nay, c\u00f9ng nhi\u1ec1u nh\u00e0 qu\u1ea3ng b\u00e1 kh\u00e1c (nh\u01b0 MediaPro \u1edf T\u00e2y Ban Nha cho k\u00eanh b\u00f3ng \u0111\u00e1 GolTV) \u0111ang c\u00e2n nh\u1eafc \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt 3D.<\/p>\n

Theo \u0111\u00f3, y\u00eau c\u1ea7u c\u1ea5p thi\u1ebft l\u00e0 kh\u1ea3 n\u0103ng s\u1eb5n c\u00f3 c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb thu, gi\u1ea3i m\u00e3 d\u00e2n d\u1ee5ng. M\u1ecdi th\u1ee9 \u0111ang di\u1ec5n ti\u1ebfn r\u1ea5t nhanh khi c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ecb ph\u1ea7n l\u1edbn nh\u01b0 SAMSUNG, SONY,\u00a0PHILIPS, PANASONIC,\u2026 \u0111ang c\u1ea1nh tranh nhau \u0111\u1ec3 \u0111\u01b0a ra c\u00e1c s\u1ea3n ph\u1ea9m h\u1ed7 tr\u1ee3 n\u1ed9i dung 3D. G\u1ea7n \u0111\u00e2y, SAMSUNG \u0111\u00e3 cung c\u1ea5p TV h\u1ed7 tr\u1ee3 3DTV v\u1edbi gi\u00e1 t\u1eeb 2500 \u0111\u00f4 la, k\u00e8m theo hai c\u1eb7p k\u00ednh, trong khi \u0111\u00f3 SONY \u0111\u00e3 ra m\u1eaft c\u00e1c s\u1ea3n ph\u1ea9m 3D d\u00f2ng Bravia v\u00e0o 7\/2010.<\/p>\n

Th\u1ecb tr\u01b0\u1eddng hi\u1ec3n th\u1ecb 3D c\u00f3 s\u1ef1 t\u00e1c \u0111\u1ed9ng t\u00edch c\u1ef1c t\u1eeb th\u00e0nh c\u00f4ng g\u1ea7n \u0111\u00e2y c\u1ee7a c\u00e1c r\u1ea1p phim 3D \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n s\u1ebd c\u1ea5t c\u00e1nh trong n\u0103m 2010. Trong h\u00ecnh 1, DisplaySearch d\u1ef1\u00a0\u0111o\u00e1n TV 3D-ready s\u1ebd ph\u00e1t tri\u1ec3n t\u1eeb 0.2 tri\u1ec7u TV v\u00e0o n\u0103m 2009 l\u00ean 64 tri\u1ec7u TV v\u00e0o n\u0103m 2018, v\u00e0 d\u1ef1 \u0111o\u00e1n TV 3D-ready s\u1ebd l\u00e0 s\u1ea3n ph\u1ea9m d\u00e2n d\u1ee5ng mang l\u1ea1i ngu\u1ed3n thu l\u1edbn nh\u1ea5t cho c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t trong n\u0103m 2018 v\u1edbi doanh thu 17 t\u1ef7 \u0111\u00f4 la tr\u00ean to\u00e0n th\u1ebf gi\u1edbi.<\/p>\n

C\u00f3 th\u1ec3 th\u1ea5y, v\u1edbi s\u1ef1 n\u1ed5i l\u00ean c\u1ee7a n\u1ed9i dung 3DTV \u1edf ph\u00eda s\u1ea3n xu\u1ea5t v\u00e0 s\u1ef1 gia t\u0103ng\u00a0c\u1ee7a m\u00e0n h\u00ecnh 3D \u1edf ph\u00eda ng\u01b0\u1eddi d\u00f9ng, t\u1ea5t y\u1ebfu s\u1ebd t\u1ea1o s\u1ee9c \u00e9p \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 trong vi\u1ec7c h\u01b0\u1edbng \u0111\u1ebfn c\u00e1c gi\u1ea3i ph\u00e1p truy\u1ec1n d\u1eabn 3DTV trong th\u1eddi gian t\u1edbi cho ng\u01b0\u1eddi xem.<\/p>\n

2. C\u00e1c y\u00eau c\u1ea7u khi ph\u00e1t qu\u1ea3ng b\u00e1 d\u1ecbch v\u1ee5 3D.<\/strong><\/p>\n

Sau m\u1ed9t s\u1ed1 th\u1eed nghi\u1ec7m 3DTV, c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 v\u1eabn c\u00f2n c\u00e2n nh\u1eafc v\u1ec1 dung l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft cho m\u1ed9t d\u1ecbch v\u1ee5 3D, v\u00e0 c\u00e1ch th\u1ee9c d\u1ecbch v\u1ee5 2D v\u00e0 3D c\u00f3 th\u1ec3 ph\u00e1t s\u00f3ng hi\u1ec7u qu\u1ea3 nh\u1ea5t trong b\u1ed1i c\u1ea3nh ph\u1ed5 t\u1ea7n khan hi\u1ebfm hi\u1ec7n nay. Hi\u1ec7n nay, c\u00f3 nhi\u1ec1u k\u1ef9 thu\u1eadt truy\u1ec1n d\u1ecbch v\u1ee5 3D v\u00e0 t\u1ea5t c\u1ea3 v\u1eabn \u0111ang \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1, n\u00ean ch\u01b0a c\u00f3 ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt c\u1ee5 th\u1ec3 cho d\u1ecbch v\u1ee5 3D. V\u00e0o 7\/2009, ZetaCast
\n thay m\u1eb7t cho Ofcom (c\u1ee7a Anh) \u0111\u00e3 xu\u1ea5t b\u1ea3n th\u00f4ng b\u00e1o \u0111\u1ed9c l\u1eadp \u201cBeyond HDTV: Implications for Digital Delivery\u201d \u0111\u00e3 x\u00e1c \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 bit c\u00e1c k\u00eanh 3D d\u1ef1a tr\u00ean k\u00eanh 2D theo c\u00e1c k\u1ef9 thu\u1eadt 3D kh\u00e1c nhau nh\u01b0 sau (b\u1ea3ng 1).<\/p>\n

Trong th\u00f4ng b\u00e1o n\u00e0y, ZetaCast gi\u1ea3 s\u1eed \u0111\u1ed9 ph\u00e2n gi\u1ea3i video 1080p\/50Hz HDTV \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i cho m\u1ed7i m\u1eaft (v\u1edbi nhi\u1ec1u t\u00f9y ch\u1ecdn kh\u00e1c nhau). V\u1edbi c\u00e1ch ph\u00e2n ph\u1ed1i n\u00e0y, vi\u1ec7c \u0111\u1ed3ng b\u1ed9 khi ph\u00e1t s\u00f3ng cho m\u1eaft tr\u00e1i v\u00e0 m\u1eaft ph\u1ea3i c\u1ee7a ng\u01b0\u1eddi xem l\u00e0 \u0111\u01a1n gi\u1ea3n nh\u01b0ng nh\u01b0ng chi\u1ebfm t\u1ed1c \u0111\u1ed9 bit cao (200% so v\u1edbi
\n k\u00eanh 2D). C\u00e1c k\u1ef9 thu\u1eadt kh\u00e1c c\u00f3 gi\u1ea3i ph\u00e1p \u0111\u1ec3 gi\u1ea3m t\u1ed1c \u0111\u1ed9 bit video, nh\u01b0ng k\u00e8m theo m\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ec3 x\u1eed l\u00fd v\u00e0 gi\u1ea3i m\u00e3 t\u00edn hi\u1ec7u, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3
\n t\u1ea1o th\u00eam m\u1ed9t s\u1ed1 chi ph\u00ed cho ph\u00ed ng\u01b0\u1eddi d\u00f9ng.<\/p>\n


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T\u1eeb d\u1eef li\u1ec7u cung c\u1ea5p c\u1ee7a ZetaCast, c\u00f3 th\u1ec3 ch\u1ecdn t\u1ec9 gi\u1eefa n\u1ed9i dung 3D v\u00e0 2D x\u1ea5p x\u1ec9 kho\u1ea3ng
\n 160%, g\u1ed3m \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a m\u1ed9t k\u00eanh 2D c\u1ed9ng ph\u01b0\u01a1ng ph\u00e1p Depth ho\u1eb7c Difference (2D plus Depth ho\u1eb7c 2D plus Difference) \u0111\u1ec3 truy\u1ec1n d\u1eabn. \u0110\u1ec3 c\u00f3 th\u1ec3\u00a0\u01b0\u1edbc t\u00ednh t\u1ed1c \u0111\u1ed9 bit th\u1ef1c t\u1ebf cho d\u1ecbch v\u1ee5 3DTV, b\u01b0\u1edbc k\u1ebf ti\u1ebfp l\u00e0 x\u00e1c \u0111\u1ecbnh c\u1ee5 th\u1ec3 b\u0103ng th\u00f4ng d\u1eef li\u1ec7u v\u00e0 c\u00e1c t\u1ed1c \u0111\u1ed9 bit hi\u1ec7n d\u00f9ng cho c\u00e1c d\u1ecbch v\u1ee5\u00a0HDTV (2D). B\u1ea3ng 2 minh h\u1ecda c\u00e1c t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u kh\u00e1c nhau, \u0111\u1ed9 ph\u00e2n gi\u1ea3i video, v\u00e0 chu\u1ea9n truy\u1ec1n d\u1eabn hi\u1ec7n \u0111ang d\u00f9ng cho c\u00e1c k\u00eanh HDTV tr\u00ean c\u00e1c m\u1ea1ng\u00a0m\u1eb7t \u0111\u1ea5t (\u1edf Ph\u00e1p v\u00e0 Anh). V\u1edbi gi\u1ea3 s\u1eed t\u1ec9 s\u1ed1 160%, c\u00f3 th\u1ec3 suy ra \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u y\u00eau c\u1ea7u cho d\u1ecbch v\u1ee5 3D.<\/p>\n

\u1ede Ph\u00e1p, c\u00e1c d\u1ecbch HDTV\u00a0\u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u00ean m\u1ea1ng DVB-T, m\u1ed9t gh\u00e9p k\u00eanh 8 MHz nh\u01b0 \u201cR5\u201d truy\u1ec1n t\u1ea3i 3 ch\u01b0\u01a1ng tr\u00ecnh HD: TF1HD, France2HD, v\u00e0 M6HD v\u1edbi t\u1ed5ng b\u0103ng th\u00f4ng l\u00e0 24.88 Mbps (FFT 8K, 64QAM, GI 1\/8, FEC 3\/4). Ba d\u1ecbch v\u1ee5 HDTV n\u00e0y \u0111\u01b0\u1ee3c gh\u00e9p k\u00eanh th\u1ed1ng k\u00ea nh\u1eb1m t\u0103ng hi\u1ec7u qu\u1ea3 \u0111\u01b0\u1eddng truy\u1ec1n, t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u c\u1ee7a m\u1ed7i d\u1ecbch v\u1ee5 thay \u0111\u1ed5i t\u1eeb 4 \u0111\u1ebfn 14 Mbps, v\u00e0 t\u1ed1c \u0111\u1ed9 bit trung b\u00ecnh c\u1ee7a m\u1ed7i d\u1ecbch v\u1ee5 l\u00e0 8 Mbps.<\/p>\n

V\u1ec1 \u0111\u1ed9 ph\u00e2n gi\u1ea3i h\u00ecnh \u1ea3nh, \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ef1c t\u1ebf c\u00f3 s\u1ef1 sai bi\u1ec7t v\u00e0 th\u01b0\u1eddng l\u00e0\u00a01440\u00d71080 so v\u1edbi \u0111\u1ed9 ph\u00e2n gi\u1ea3i HD \u0111\u1ea7y \u0111\u1ee7\u00a0l\u00e0 1920\u00d71080.<\/p>\n

C\u00f3 ba l\u00fd do ch\u00ednh sau: th\u1ee9 nh\u1ea5t, n\u00f3 gi\u1ea3m t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u truy\u1ec1n so v\u1edbi \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u0111\u1ea7y \u0111\u1ee7\u00a0(-30%); th\u1ee9 hai, \u0111\u1ed9 ph\u00e2n gi\u1ea3i n\u00e0y gi\u1ed1ng\u00a0v\u1edbi nh\u1eefng n\u1ed9i dung cung c\u1ea5p t\u1eeb c\u00e1c ngu\u1ed3n thi\u1ebft b\u1ecb quay d\u00e2n d\u1ee5ng nh\u01b0 HDV\/HDCAM; th\u1ee9 ba, ph\u1ea7n l\u1edbn n\u1ed9i dung\u00a0HD \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t \u1edf \u0111\u1ed9 ph\u00e2n gi\u1ea3i n\u00e0y.<\/p>\n

\u1ede Anh, g\u1ea7n \u0111\u00e2y Freeview \u0111\u00e3 b\u1eaft \u0111\u1ea7u n\u00e2ng c\u1ea5p chu\u1ea9n ph\u00e1t s\u00f3ng m\u1eb7t \u0111\u1ea5t th\u00e0nh DVB-T2 \u0111\u1ec3 ph\u00e2n ph\u1ed1i c\u00e1c d\u1ecbch v\u1ee5 HDTV. Hi\u1ec7n nay, gh\u00e9p k\u00eanh Freeview HD\u00a0truy\u1ec1n t\u1ea3i 3 d\u1ecbch v\u1ee5 (b\u0103ng th\u00f4ng k\u00eanh th\u1ef1c t\u1ebf v\u1eabn c\u00f2n cho ph\u00e9p gia t\u0103ng th\u00eam d\u1ecbch v\u1ee5 trong t\u01b0\u01a1ng lai). T\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u t\u1ed5ng c\u1ee7a BBC HDtr\u00ean m\u1ed7i d\u1ecbch v\u1ee5 hi\u1ec7n chi\u1ebfm trung b\u00ecnh 13 Mbps, nh\u01b0ng t\u1ed1c \u0111\u1ed9 n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c gi\u1ea3m xu\u1ed1ng \u0111\u1ebfn 9 Mbps \u0111\u1ec3 c\u00f3 th\u1ec3 cung\u00a0c\u1ea5p 4 d\u1ecbch v\u1ee5 tr\u00ean m\u1ed9t gh\u00e9p k\u00eanh.<\/p>\n

T\u1eeb t\u1ed1c \u0111\u1ed9 bit c\u1ee7a c\u00e1c d\u1ecbch v\u1ee5 HDTV hi\u1ec7n nay cho ph\u00e9p d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 bit c\u1ea7n thi\u1ebft cho m\u1ed9t d\u1ecbchv\u1ee5 3DTV trong th\u1eddi gian t\u1edbi. N\u1ebfu d\u00f9ng t\u1ec9\u00a0s\u1ed1 3D v\u00e0 2D l\u00e0 160%, m\u1ed9t d\u1ecbch v\u1ee5 3DTV khi ph\u00e1t qu\u1ea3ng b\u00e1 s\u1ebd chi\u1ebfm kho\u1ea3ng 13 Mbps (gi\u1ea3 s\u1eed d\u00f9ng \u0111\u1ed9 ph\u00e2n gi\u1ea3i 1440\u00d71080 v\u00e0 \u0111\u1ecbnh d\u1ea1ng 2D Plus
\n Difference\/Depth).
\n 3. \u0110\u1ecbnh d\u1ea1ng t\u01b0\u01a1ng th\u00edch frame (Frame Compatible) c\u1ee7a\u00a03DTV.<\/strong><\/p>\n

Tr\u01b0\u1edbc khi \u1ee9ng d\u1ee5ng b\u1ea5t k\u1ef3 k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a t\u1ed1i \u01b0u 3DTV nh\u01b0 2D Plus Difference\/Depth ho\u1eb7c \u0111\u1ecbnh d\u1ea1ng m\u1edbi d\u1ef1a tr\u00ean MPEG-4 \u201cMultiview Video Coding\u201d (v\u00ed d\u1ee5 MPEG-4 AVC v\u1edbi m\u1edf r\u1ed9ng MVC \u2013 ITU-T Rec. H.264 & ISO\/IEC 14996-10 Advanced Video Coding (AVC) standard on Multiview Video Coding), k\u1ebf ho\u1ea1ch c\u1ee7a c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 l\u00e0 b\u1eaft \u0111\u1ea7u ph\u00e1t s\u00f3ng 3DTV d\u00f9ng d\u1ecbnh d\u1ea1ng \u0111\u01b0\u1ee3c g\u1ecdi\u00a0l\u00e0 \u201cFrame Compatible\u201d (t\u01b0\u01a1ng th\u00edch frame).<\/p>\n

\u0110i\u1ec1u n\u00e0y l\u00e0 v\u00ec, trong giai \u0111o\u1ea1n \u0111\u1ea7u c\u1ee7a ph\u00e1t s\u00f3ng d\u1ecbch v\u1ee5 3DTV, m\u1ee5c \u0111\u00edch c\u1ee7a c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 l\u00e0 s\u1eed d\u1ee5ng l\u1ea1i nh\u1eefng g\u00ec c\u00f3 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i HDTV hi\u1ec7n c\u00f3 \u0111\u1ec3 ph\u00e2n ph\u1ed1i n\u1ed9i dung 3DTV, v\u00e0 n\u1ebfu c\u00f3 th\u1ec3 l\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a d\u1ecbch v\u1ee5 3DTV \u0111\u01b0\u1ee3c truy\u1ec1n d\u1eabn v\u1edbi c\u00e1c thi\u1ebft b\u1ecb hi\u1ec3n th\u1ecb 2D.<\/p>\n

M\u1ed9t v\u00e0i \u0111\u1ecbnh d\u1ea1ng \u201cFrame Compatible\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a nh\u01b0 \u201cSide-By-Side\u201d, \u201cTop\/Bottom\u201d,\u2026 v\u00e0 t\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi giao di\u1ec7n HDMI 1.4 (phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t hi\u1ec7n nay). \u00dd t\u01b0\u1edfng c\u1ee7a \u0111\u1ecbnh d\u1ea1ng \u201cFrame Compatible\u201d l\u00e0 d\u1ef1a tr\u00ean n\u1eeda \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a \u1ea3nh tr\u00e1i v\u00e0 \u1ea3nh ph\u1ea3i v\u00ec th\u1ebf hai t\u00edn\u00a0hi\u1ec7u c\u00f3 th\u1ec3 \u00e9p (g\u00f3i) v\u1edbi nhau v\u00e0 k\u1ebft h\u1ee3p th\u00e0nh m\u1ed9t frame, v\u00ec th\u1ebf n\u00f3 gi\u1ed1ng nh\u01b0 m\u1ed9t t\u00edn hi\u1ec7u 2D\u00a0HDTV cung c\u1ea5p cho STB th\u00f4ng th\u01b0\u1eddng. Sau\u00a0\u0111\u00f3, hai h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c t\u00e1ch ra th\u00e0nh \u1ea3nh cho m\u1eaft tr\u00e1i v\u00e0 m\u1eaft ph\u1ea3i trong m\u00e1y thu h\u00ecnh, v\u00e0 hi\u1ec3n th\u1ecb ri\u00eang tr\u00ean m\u00e0n h\u00ecnh theo h\u1ec7 th\u1ed1ng xem 3D s\u1eed d\u1ee5ng\u00a0(anaglyph, polarisation, shutter,\u2026). \u0110i\u1ec1u n\u00e0y cho ph\u00e9p nh\u00e0 qu\u1ea3ng b\u00e1 s\u1eed d\u1ee5ng l\u1ea1i h\u1ec7 th\u1ed1ng truy\u1ec1n d\u1eabn hi\u1ec7n d\u00f9ng \u0111ang ph\u00e1t s\u00f3ng c\u00e1c n\u1ed9i dung\u00a0HDTV chu\u1ea9n c\u00f9ng v\u1edbi c\u00e1c b\u1ed9 m\u00e3 h\u00f3a video H.264.<\/p>\n

L\u1ea5y v\u00ed d\u1ee5 t\u1eeb k\u00eanh SKY\u00a03DTV ph\u00e1t s\u00f3ng v\u1ec7 tinh, b\u1ed9 m\u00e3 h\u00f3a video ph\u00e2n ph\u1ed1i d\u1ecbch v\u1ee5 video v\u1edbi t\u1ed1c \u0111\u1ed9 bit t\u1ed5ng kho\u1ea3ng 14 Mbps v\u1edbi\u00a0\u0111\u1ed9 ph\u00e2n gi\u1ea3i pixel c\u1ee7a h\u00ecnh \u1ea3nh l\u00e0\u00a01920\u00d71080 cho m\u1ed7i frame. \u0110\u1ed9 ph\u00e2n gi\u1ea3i theo chi\u1ec1u ngang th\u1ef1c t\u1ebf cho m\u1ed7i m\u1eaft l\u00e0 n\u1eeda c\u1ee7a c\u1ee7a \u0111\u1ed9 ph\u00e2n gi\u1ea3i\u00a0frame, ng\u01b0\u1eddi xem s\u1ebd tr\u1ea3i nghi\u1ec7m m\u1ed9t \u0111\u1ed9\u00a0ph\u00e2n gi\u1ea3i t\u01b0\u01a1ng \u0111\u01b0\u01a1ng ch\u1ec9 960 pixel tr\u00ean 1080 d\u00f2ng cho n\u1ed9i dung 3DTV. C\u00f3 th\u1ec3 th\u1ea5y t\u1ed1c \u0111\u1ed9 14 Mbps kh\u00f4ng\u00a0qu\u00e1 l\u1edbn so v\u1edbi t\u1ed1c \u0111\u1ed9 13 Mbps trong gi\u1ea3\u00a0\u0111\u1ecbnh \u1edf tr\u00ean.<\/p>\n

4. C\u1ea5u tr\u00fac chung cho truy\u1ec1n d\u1eabn 3D.<\/strong><\/p>\n

C\u1ea5u tr\u00fac chung \u0111\u1ec3 ph\u00e1t ph\u00e1t s\u00f3ng 3D \u0111\u01b0\u1ee3c minh h\u1ecda\u00a0trong h\u00ecnh 2. N\u1ed9i dung 3D c\u00f3 th\u1ec3 c\u00f3 th\u1ec3
\n t\u1ea1o ra t\u1eeb ngu\u1ed3n t\u00edn hi\u1ec7u tr\u1ef1c ti\u1ebfp ho\u1eb7c t\u1eeb c\u00e1c server n\u1ed9i dung. Trong tr\u01b0\u1eddng h\u1ee3p tr\u1ef1c ti\u1ebfp, camera 3D s\u1ebd\u00a0cung c\u1ea5p t\u00edn hi\u1ec7u stereoscopic 3D t\u1ed5ng h\u1ee3p\u00a0\u0111\u1ec3 xem cho m\u1eaft tr\u00e1i v\u00e0 m\u1eaft ph\u1ea3i. \u1ede ph\u00eda cung\u00a0
\n c\u1ea5p d\u1ecbch v\u1ee5, c\u00e1c b\u1ed9 encoder m\u00e3 h\u00f3a th\u1eddi gian th\u1ef1c t\u1ea1o ra c\u00e1c t\u00edn hi\u1ec7u n\u00e9n \u0111\u1ec3 truy\u1ec1n tr\u00ean m\u1ea1ng qu\u1ea3ng b\u00e1. T\u00edn hi\u1ec7u\u00a0n\u00e9n bao g\u1ed3m m\u1ed9t d\u1ecbch v\u1ee5 video v\u00e0 m\u1ed9t ho\u1eb7c\u00a0m\u1ed9t v\u00e0i th\u00e0nh ph\u1ea7n audio.<\/p>\n

H\u1ea1 t\u1ea7ng qu\u1ea3ng b\u00e1 s\u1ed1<\/strong>
\n c\u00f3 th\u1ec3 t\u00e1ch ri\u00eang th\u00e0nh 2 nh\u00f3m: h\u1ea1 t\u1ea7ng\u00a0d\u1ef1a tr\u00ean IP v\u00e0 h\u1ea1 t\u1ea7ng d\u1ef1a tr\u00ean TS\u00a0(Transport Stream). V\u1edbi ph\u00e2n ph\u1ed1i d\u1ef1a tr\u00ean IP, c\u00e1c d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c \u0111\u00f3ng\u00a0g\u00f3i IP v\u00e0 truy\u1ec1n t\u1eeb c\u00e1c encoder d\u1ecbch v\u1ee5
\n kh\u00e1c nhau \u0111\u1ebfn kh\u00e1ch h\u00e0ng th\u00f4ng qua m\u1ea1ng\u00a0IP. Trong c\u1ea5u tr\u00fac TS, b\u1ed9 gh\u00e9p k\u00eanh d\u1ecbch v\u1ee5 t\u1eadp h\u1ee3p t\u1ea5t c\u1ea3 c\u00e1c stream d\u1ecbch v\u1ee5 \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a kh\u00e1c nhau v\u00e0o\u00a0d\u00f2ng TS \u0111a ch\u01b0\u01a1ng tr\u00ecnh c\u00f2n g\u1ecdi l\u00e0 MPTS
\n (Multi-Program Transport Stream). MPTS \u0111\u01b0\u1ee3c gh\u00e9p k\u00eanh th\u1ed1ng k\u00ea \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u qu\u1ea3 c\u1ee7a b\u0103ng th\u00f4ng t\u1ed5ng v\u00e0\u00a0\u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn c\u00e1c n\u1ec1n t\u1ea3ng qu\u1ea3ng b\u00e1 s\u1ed1\u00a0nh\u01b0 DTH, m\u1ea1ng c\u00e1p, m\u1ea1ng m\u1eb7t \u0111\u1ea5t s\u1ed1 \u0111\u1ec3 ph\u00e1t s\u00f3ng.<\/p>\n


<\/p>\n

\"\"<\/div>\n

\u1ede ph\u00eda kh\u00e1ch h\u00e0ng, c\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt s\u1ebd thay \u0111\u1ed5i \u00a0t\u00f9y theo k\u1ef9 thu\u1eadt 3D kh\u00e1c nhau \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.
\n V\u00ed d\u1ee5, c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb hi\u1ec3n th\u1ecb \u0111\u00e3 s\u1eb5n s\u00e0ng cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p c\u00e1c hi\u1ec3n th\u1ecb 3D
\n d\u00f9ng k\u00ednh ph\u00e2n c\u1ef1c, k\u00ednh c\u1eeda ch\u1eadp, ho\u1eb7c\u00a0th\u1eadm ch\u00ed l\u00e0 kh\u00f4ng d\u00f9ng k\u00ednh (tr\u01b0\u1eddng h\u1ee3p\u00a0auto-stereoscopic)\u2026 Trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a d\u1ecbch v\u1ee5 PayTV, c\u00e1c thi\u1ebft b\u1ecb cu\u1ed1i \u1edf ph\u00eda kh\u00e1ch h\u00e0ng (STB ho\u1eb7c PVR) th\u00ec v\u1eabn\u00a0ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng v\u00e0 l\u1edd \u0111i c\u00e1c d\u1ecbch\u00a0v\u1ee5 n\u1ed9i dung 3D. C\u00e1c nh\u00e0 \u0111i\u1ec1u h\u00e0nh PayTV mu\u1ed1n ph\u00e1t tri\u1ec3n d\u1ecbch v\u1ee5 3D \u0111ang c\u00e2n nh\u1eafc c\u00e1c v\u1ea5n \u0111\u1ec1 k\u1ef9 thu\u1eadt\u00a0\u0111\u1ec3 h\u1ea1n ch\u1ebf c\u00e1c t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn thi\u1ebft b\u1ecb cu\u1ed1i\u00a0c\u1ee7a kh\u00e1ch h\u00e0ng (t\u1ea5t nhi\u00ean h\u1ecd tr\u00e1nh c\u00e1c thay \u0111\u1ed5i v\u1ec1 c\u1ea5u tr\u00fac m\u1ea1ng v\u00e0 s\u1ebd d\u00f9ng l\u1ea1i m\u1ea1ng hi\u1ec7n c\u00f3).<\/p>\n

5. Th\u1ecb tr\u01b0\u1eddng DVB-T2 \u0111ang \u201cd\u1eady s\u00f3ng\u201d.<\/strong><\/p>\n

K\u1ec3 t\u1eeb khi \u0111\u01b0\u1ee3c gi\u1edbithi\u1ec7u v\u00e0o n\u0103m 2008, chu\u1ea9n truy\u1ec1n h\u00ecnh s\u1ed1 m\u1eb7t \u0111\u1ea5t th\u1ebf h\u1ec7 th\u1ee9 hai DVB-T2 \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 quan t\u00e2m t\u00edch c\u1ef1c c\u1ee7a c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 v\u1edbi m\u1ee5c\u00a0ti\u00eau cung c\u1ea5p th\u1ebf h\u1ec7 m\u1edbi c\u00e1c d\u1ecbch v\u1ee5 truy\u1ec1n h\u00ecnh s\u1ed1 m\u1eb7t \u0111\u1ea5t.<\/p>\n

V\u1ec1 quan \u0111i\u1ec3m k\u1ef9 thu\u1eadt, so v\u1edbi chu\u1ea9n tr\u01b0\u1edbc \u0111\u00e2y l\u00e0 DVB-T th\u00ec\u00a0DVB-T2 c\u00f3 m\u1ed9t s\u1ed1 \u01b0u \u0111i\u1ec3m nh\u01b0 minh h\u1ecda trong h\u00ecnh 3.<\/p>\n

\u01afu \u0111i\u1ec3m l\u1edbn nh\u1ea5t c\u1ee7a DVB-T2 l\u00e0 kh\u1ea3 n\u0103ng truy\u1ec1n d\u1eef li\u1ec7u v\u1edbi t\u1ed1c \u0111\u1ed9 cao h\u01a1n DVB-T, \u0111\u00e2y l\u00e0
\n y\u00eau c\u1ea7u quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 c\u00f3 th\u1ec3 vi\u1ec7c truy\u1ec1n c\u00e1c d\u1ecbch v\u1ee5 HDTV v\u00e0 3DTV c\u00f3 t\u1ed1c b\u1ed9 bit l\u1edbn h\u01a1n nhi\u1ec1u so v\u1edbi c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh SDTV.<\/p>\n

Hi\u1ec7n nay, m\u1ed9t v\u00e0i qu\u1ed1cgia \u0111\u00e3 th\u1ec3 hi\u1ec7n s\u1ef1 quan t\u00e2m c\u1ee7a h\u1ecd \u0111\u1ed1i v\u1edbi DVB-T2. S\u1edbm nh\u1ea5t l\u00e0 BBC v\u00e0 ARQIVA \u1edf Anh \u0111\u00e3 quy\u1ebft \u0111\u1ecbnh ph\u00e1t tri\u1ec3n c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng v\u00e0 d\u1ecbch v\u1ee5\u00a0theo DVB-T2, v\u00ec th\u1ebf m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng kh\u00e1 l\u1edbn ng\u01b0\u1eddi d\u00e2n Anh \u0111\u00e3 \u0111\u01b0\u1ee3c xem c\u00e1c d\u1ecbch v\u1ee5 HDTV trong FIFA World Cup v\u1eeba r\u1ed3i. \u1ede Ph\u1ea7n Lan, DNA \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p\u00a0ph\u00e9p hai gh\u00e9p k\u00eanh cho d\u1ecbch v\u1ee5 HDTV, v\u00e0 h\u1ecd \u0111ang c\u00f3 k\u1ebf ho\u1ea1ch tri\u1ec3n khai m\u1ea1ng DVB-T2 ph\u1ee7 s\u00f3ng 60% d\u00e2n s\u1ed1 v\u00e0o n\u0103m 2011. M\u1ed9t s\u1ed1 qu\u1ed1c gia kh\u00e1c c\u0169ng quan t\u00e2m \u0111\u1ebfn k\u1ef9 thu\u1eadt DVB-T2, s\u1ef1 ph\u00e1t tri\u1ec3n theo s\u1ed1 l\u01b0\u1ee3ng l\u1edbn m\u1ea1ng DVB-T2 \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n s\u1ebd di\u1ec5n ra sau c\u00e1c k\u1ebf ho\u1ea1ch ASO (Analog Switch Of \u2013 ch\u1ea5m d\u1ee9t ph\u00e1t s\u00f3ng t\u01b0\u01a1ng t\u1ef1) \u1edf Ch\u00e2u \u00c2u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong v\u00e0i n\u0103m t\u1edbi.<\/p>\n

C\u00f3 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 gi\u00fap cho k\u1ef9 thu\u1eadt DVB ph\u00e1t tri\u1ec3n nh\u01b0 minh h\u1ecda trong h\u00ecnh 4. C\u00e1c y\u1ebfu t\u1ed1 n\u00e0y li\u00ean quan \u0111\u1ebfn \u01b0u th\u1ebf hi\u1ec7n c\u00f3 c\u1ee7a d\u1ecbch v\u1ee5 truy\u1ec1n h\u00ecnh m\u1eb7t \u0111\u1ea5t; v\u00ed d\u1ee5, c\u00e1c qu\u1ed1c gia nh\u01b0 Anh, T\u00e2y Ban Nha, Ph\u00e1p v\u00e0 \u00dd c\u00f3 s\u1ed1 l\u01b0\u1ee3ng l\u1edbn h\u1ed9 d\u00f9ng truy\u1ec1n h\u00ecnh m\u1eb7t \u0111\u1ea5t n\u00ean d\u0129 nhi\u00ean ph\u1ea3i quan t\u00e2m \u0111\u1ebfn vi\u1ec7c chuy\u1ec3n sang DVB-T2.<\/p>\n


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Do \u0111\u00f3, s\u1ef1 th\u00e0nh c\u00f4ng trong t\u01b0\u01a1ng lai c\u1ee7a DVB-T2li\u00ean quan \u0111\u1ebfn s\u1ef1 gia t\u0103ng y\u00eau c\u1ea7u n\u1ed9i dung HDTV c\u1ee7a kh\u00e1ch h\u00e0ng v\u00e0 d\u1ef1 \u0111o\u00e1n v\u1ec1 m\u1ee9c \u0111\u1ed9 thu h\u00fat c\u1ee7a 3DTV. Th\u1eadt v\u1eady, nh\u1eefng n\u1ed9i dung n\u00e0y s\u1ebd y\u00eau c\u1ea7u nhi\u1ec1u b\u0103ng th\u00f4ng d\u1eef li\u1ec7u h\u01a1n v\u00e0 vi\u1ec7c chuy\u1ec3n t\u1eeb DVB-T \u0111\u1ebfn DVB-T2 l\u00e0 c\u1ea7n thi\u1ebft. H\u01a1n n\u1eefa, t\u00ednh c\u1ea1nh tranh c\u1ee7a truy\u1ec1n h\u00ecnh s\u1ed1 m\u1eb7t \u0111\u1ea5t \u0111\u1ed1i v\u1edbi c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn kh\u00e1c c\u0169ng l\u00e0 y\u1ebfu t\u1ed1 \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng ph\u1ea3i x\u00e9t \u0111\u1ebfn. Trong b\u1ed1i c\u1ea3nh c\u00f3 nhi\u1ec1u s\u1ef1 c\u1ea1nh tranh t\u1eeb c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n kh\u00e1c (c\u00e1p, IPTV, v\u1ec7 tinh), cu\u1ed9c \u0111ua v\u1ec1 giat\u0103ng b\u0103ng th\u00f4ng s\u1ebd kh\u00f4ng k\u1ebft th\u00fac v\u00e0 \u0111i\u1ec1u n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn h\u00ecnh th\u00e0nh k\u1ef9 thu\u1eadt truy\u1ec1n th\u1ebf h\u1ec7 k\u1ebf ti\u1ebfp \u01b0u vi\u1ec7t\u00a0h\u01a1n. Hi\u1ec7n nay, m\u00f4i tr\u01b0\u1eddng truy\u1ec1n v\u1ec7 tinhv\u00e0 c\u00e1p, c\u00e1c chu\u1ea9n DVB-S2 v\u00e0 DVB-C2 c\u0169ng \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u v\u00e0 cho ph\u00e9p gia t\u0103ng b\u0103ng th\u00f4ng \u0111\u00e1ng k\u1ec3 so v\u1edbi nh\u1eefng chu\u1ea9n tr\u01b0\u1edbc \u0111\u00f3 l\u00e0 DVB-S v\u00e0\u00a0DVB-C. Do \u0111\u00f3, DVB-T2 l\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n ph\u00f9 h\u1ee3p \u0111\u1ec3 gi\u00fap cho m\u00f4i tr\u01b0\u1eddng truy\u1ec1n m\u1eb7t \u0111\u1ea5t c\u00f3 v\u1ecb tr\u00ed c\u1ea1nh tranh t\u00edch c\u1ef1c so v\u1edbi c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn kh\u00e1c.<\/p>\n

6. Dung l\u01b0\u1ee3ng \u0111\u01b0\u1eddng truy\u1ec1n DVB-T2.<\/strong><\/p>\n

Ti\u1ebfp b\u01b0\u1edbc nh\u1eefng th\u00e0nh c\u00f4ng c\u1ee7a DVB-T, DVB-T2 c\u00f3 nh\u1eefng k\u1ebf th\u1eeba v\u00e0 t\u01b0\u01a1ng th\u00edch v\u1edbi h\u1ecd c\u00e1c chu\u1ea9n DVB. DVB-T2 d\u00f9ng \u0111i\u1ec1u ch\u1ebf OFDM (Orthogonal Frequency Division\u00a0Multiplex) \u0111\u1ec3 ph\u00e2n ph\u1ed1i t\u00edn hi\u1ec7u, c\u00f3 kh\u1ea3 n\u0103ng kh\u00e1ng nhi\u1ec5u m\u1ea1nh theo c\u00e1c mode kh\u00e1c nhau, v\u00e0 c\u00f3 \u0111\u1ed9 linh ho\u1ea1t cao. N\u00f3 s\u1eed d\u1ee5ng m\u00e3 s\u1eeda l\u1ed7i l\u00e0 LDPC (Low Density Parity Check) \u0111\u00e3 \u0111\u01b0\u1ee3c d\u00f9ng trong DVB-S2 cho hi\u1ec7u qu\u1ea3 r\u1ea5t t\u1ed1t trong \u0111\u01b0\u1eddng truy\u1ec1n c\u00f3 m\u1ee9c nhi\u1ec5u v\u00e0 xen nhi\u1ec5u cao. M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m kh\u00e1c c\u00f3 nhi\u1ec1u c\u1ea3i ti\u1ebfn \u0111\u00e1ng k\u1ec3 nh\u01b0 PLP (Physical Layer Pipes), h\u1ed7 tr\u1ee3 th\u00eam MISO (Multiple Input Single Output) v\u00e0 c\u00e1c ch\u00f2m sao xoay (Rotated Costellation) (h\u00ecnh 5) \u0111\u00e3 g\u00f3p ph\u1ea7n gia t\u0103ng \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

\u0110\u1ec3 gia t\u0103ng dung l\u01b0\u1ee3ng cho m\u1ed9t b\u0103ng th\u00f4ng k\u00eanh, DVB-T2 h\u1ed7 tr\u1ee3 ch\u00f2m sao t\u00edn hi\u1ec7u \u0111\u1ebfn
\n 256-QAM \/ s\u00f3ng mang. H\u01a1n n\u1eefa, t\u1ec9 s\u1ed1 b\u1ea3o v\u1ec7 gi\u1ea3m xu\u1ed1ng 1\/128 nh\u1eb1m gia t\u0103ng th\u00eam b\u0103ng th\u00f4ng h\u1eefu d\u1ee5ng \u0111\u1eb7c bi\u1ec7t l\u00e0 trong nh\u1eefng \u0111i\u1ec1u ki\u1ec7n thu t\u1ed1t (v\u00ed d\u1ee5: thu c\u1ed1 \u0111\u1ecbnh d\u00f9ng anten g\u1eafn tr\u00ean m\u00e1i
\n nh\u00e0).<\/p>\n

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C\u00f3 nhi\u1ec1u t\u00f9y ch\u1ecdn c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng v\u1edbi c\u00e1c th\u00f4ng s\u1ed1 \u0111i\u1ec1u ch\u1ebf kh\u00e1c nhau. M\u1ed9t s\u1ed1 c\u1ea5u h\u00ecnh \u0111\u00e3
\n \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 ch\u1ecdn ph\u00e1t s\u00f3ng g\u1ea7n \u0111\u00e2y, b\u1ea3ng 3 minh h\u1ecda m\u1ed9t c\u1ea5u h\u00ecnh chi ti\u1ebft:<\/p>\n

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C\u1ea5u h\u00ecnh n\u00e0y hi\u1ec7n \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng t\u1ea1i m\u1ed9t s\u1ed1 qu\u1ed1c\u00a0gia kh\u00e1c nhau (d\u01b0\u1edbi d\u1ea1ng th\u1eed nghi\u1ec7m) v\u00e0
\n d\u00f9ng c\u01a1 ch\u1ebf SISO (Single Input Single Output). Tuy nhi\u00ean, DVB-T2 c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 c\u00e1c k\u1ef9 thu\u1eadt kh\u00e1c
\n nh\u01b0 MISO (Multiple Input Single Output)\u00a0v\u00e0 MIMO (Multiple Input Multiple Output). M\u1ed9t minh h\u1ecda c\u1ee5 th\u1ec3 c\u1ee7a MIMO l\u00e0 d\u00f9ng m\u1ed9t c\u1eb7p anten \u1edf ph\u00eda\u00a0ph\u00e1t v\u00e0 m\u1ed9t c\u1eb7p \u1edf ph\u00eda thu, m\u1ed7i c\u1eb7p s\u1ebd
\n c\u00f3 m\u1ed9t anten ho\u1ea1t \u0111\u1ed9ng theo ph\u00e2n c\u1ef1c d\u1ecdc v\u00e0 m\u1ed9t anten ho\u1ea1t \u0111\u1ed9ng theo ph\u00e2n c\u1ef1c ngang. V\u1ec1 l\u00fd thuy\u1ebft, gi\u1ea3i\u00a0ph\u00e1p n\u00e0y c\u00f3 th\u1ec3 cho ph\u00e9p t\u0103ng g\u1ea5p \u0111\u00f4i\u00a0dung l\u01b0\u1ee3ng ph\u00e1t s\u00f3ng.<\/p>\n

M\u1eb7c d\u00f9, k\u1ef9 thu\u1eadt MIMO t\u1ecf ra h\u1ea5p d\u1eabn c\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 v\u00ec kh\u1ea3 n\u0103ng t\u0103ng dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u, tuy
\n nhi\u00ean, k\u1ef9 thu\u1eadt n\u00e0y l\u1ea1i b\u1ecb r\u00e0ng bu\u1ed9c v\u1ec1\u00a0c\u00e1c y\u00eau c\u1ea7u th\u01b0\u01a1ng m\u1ea1i cho DVB-T2, \u0111\u00f3 l\u00e0, vi\u1ec7c ph\u00e1t s\u00f3ng DVB-T2 ph\u1ea3i t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c c\u00e0i \u0111\u1eb7t DVB-T \u0111ang\u00a0c\u00f3 (ch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t anten).<\/p>\n

7. 3DTV tr\u00ean DVB-T2.<\/strong><\/p>\n

DVB-T2 \u0111\u01b0\u1ee3c k\u1ef3 v\u1ecdng s\u1ebd l\u00e0 k\u1ef9 thu\u1eadt d\u00f9ng \u0111\u1ec3 ph\u00e1t s\u00f3ng 3DTV tr\u00ean m\u1ea1ng m\u1eb7t \u0111\u1ea5t thay v\u00ec DVB-T nh\u1edd dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u truy\u1ec1n t\u1ea3i t\u0103ng h\u01a1n 40-50%. S\u1ed1 d\u1ecbch v\u1ee5 3DTV c\u00f3 th\u1ec3\u00a0truy\u1ec1n tr\u00ean DVB-T2 v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh c\u1ee5 th\u1ec3 khi m\u00e0 s\u1ef1 ph\u1ed1i h\u1ee3p gi\u1eefa hai k\u1ef9 thu\u1eadt 3D v\u00e0 DVB-T2 v\u1eabn c\u00f2n \u0111\u1ec3 ng\u00f5, c\u00e1c th\u00f4ng s\u1ed1 v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a v\u00e0 x\u00e1c \u0111\u1ecbnh \u0111\u1ea7y \u0111\u1ee7.<\/p>\n

Tuy nhi\u00ean, d\u1ef1a tr\u00ean m\u1ed9t s\u1ed1 gi\u1ea3 \u0111\u1ecbnh v\u1eabn c\u00f3 th\u1ec3 \u01b0\u1edbc t\u00ednh \u0111\u01b0\u1ee3c s\u1ed1 k\u00eanh 3D truy\u1ec1n trong m\u1ed9t gh\u00e9p k\u00eanh DVB-T2 nh\u01b0 sau:<\/p>\n


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V\u1edbi nh\u1eefng gi\u1ea3 \u0111\u1ecbnh tr\u00ean, c\u00f3 th\u1ec3 truy\u1ec1n t\u1ea3i 3 d\u1ecbch\u00a0v\u1ee5 3DTV trong m\u1ed9t gh\u00e9p k\u00eanh DVB-T2 cho m\u1ed9t
\n k\u00eanh t\u1ea7n s\u1ed1 m\u1eb7t \u0111\u1ea5t c\u00f3 b\u0103ng th\u00f4ng 8 MHz. V\u00ed d\u1ee5, hi\u1ec7n nay t\u1ea1i Ph\u00e1p m\u1ed9t gh\u00e9p k\u00eanh nh\u01b0 \u201cR5\u201d d\u00f9ng \u0111\u1ec3 truy\u1ec1n 3 d\u1ecbch v\u1ee5 HDTV (TF1 HD, M6 HD v\u00e0FRANCE 2 HD) c\u0169ng c\u00f3 th\u1ec3 truy\u1ec1n 3 d\u1ecbch v\u1ee5 3DTV n\u1ebfu d\u00f9ng DVB-T2. C\u00f3 th\u1ec3 th\u1ea5y s\u1ed1 d\u1ecbch v\u1ee5 3DTV c\u00f3 th\u1ec3 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi s\u1ed1 d\u1ecbch v\u1ee5 HDTV n\u1ebfu s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt DVB-T2 thay v\u00ec DVB-T.<\/p>\n

Ngo\u00e0i ra, m\u1ed9t s\u1ed1 k\u1ef3 v\u1ecdng\u00a0v\u1ec1 kh\u1ea3 n\u0103ng c\u1ea3i ti\u1ebfn c\u1ee7a t\u1ed1c \u0111\u1ed9 m\u00e3 h\u00f3a video, t\u0103ng hi\u1ec7u qu\u1ea3 gh\u00e9p k\u00eanh th\u1ed1ng k\u00ea,\u2026 s\u1ebd g\u00f3p ph\u1ea7n v\u00e0o c\u1ea3i thi\u1ec7n hi\u1ec7u\u00a0su\u1ea5t h\u1ec7 th\u1ed1ng DVB-T2. C\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9\u00a0ph\u00e2n gi\u1ea3i h\u00ecnh \u1ea3nh c\u1ee7a ng\u01b0\u1eddi xem c\u0169ng l\u00e0 v\u1ea5n \u0111\u1ec1 c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c x\u00e9t \u0111\u1ebfn nh\u1eb1m \u0111\u1ea3m b\u1ea3o cho s\u1ef1 tri\u1ec3n\u00a0khai th\u00e0nh c\u00f4ng c\u1ee7a 3DTV.<\/p>\n

Trong c\u1ea5u tr\u00fac h\u1ec7 th\u1ed1ng ph\u00e1t s\u00f3ng, m\u1ea1ng DVB-T2 th\u1ef1c ra kh\u00f4ng c\u1ea7n quan t\u00e2m \u0111\u00f3 c\u00f3 l\u00e0 d\u1ecbch v\u1ee5 3DTV hay l\u00e0 d\u1ecbch v\u1ee5 HDTV. Nh\u01b0trong h\u00ecnh 6, b\u1ed9 gh\u00e9p k\u00eanh d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c\u00a0k\u1ebft n\u1ed1i v\u1edbi T2 Gateway, t\u1ea1o d\u00f2ng stream ng\u00f5 ra v\u00e0 g\u1eafn c\u00e1c nh\u00e3n th\u1eddi gian (theo qui c\u00e1ch c\u1ee7a DVB-T2) \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng trong m\u1ea1ng \u0111\u01a1n t\u1ea7n SFN. D\u1eef li\u1ec7u\u00a0truy\u1ec1n \u0111\u1ebfn T2-MI c\u00f3 th\u1ec3 th\u00f4ng qua giao th\u1ee9c IP ho\u1eb7c d\u1ef1a tr\u00ean m\u1ea1ng MPEG-TS\/ASI, sau \u0111\u00f3 T2-MI s\u1ebd cung c\u1ea5p\u00a0t\u00edn hi\u1ec7u \u0111\u1ebfn m\u00e1y ph\u00e1t.<\/p>\n

M\u1ed7i m\u00e1y ph\u00e1t s\u1ebd g\u1ed3m m\u1ed9t b\u1ed9 \u0111i\u1ec1u ch\u1ebf DVB-T2 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u ch\u1ebf t\u00edn hi\u1ec7u cho c\u00e1c b\u1ed9 khu\u1ebfch \u0111\u1ea1i UHF ho\u1eb7c VHF. T\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c b\u1ee9c x\u1ea1 ra m\u00f4i tr\u01b0\u1eddng m\u1eb7t \u0111\u1ea5t th\u00f4ng qua\u00a0anten ph\u00e1t, ng\u01b0\u1eddi xem c\u00f3 th\u1ec3 thu t\u00edn hi\u1ec7u t\u1ea1i v\u1ecb tr\u00ed c\u1ed1 \u0111\u1ecbnh trong nh\u00e0 hay \u0111ang di chuy\u1ec3n.<\/p>\n


<\/p>\n

\"\"<\/div>\n

8. K\u1ebft lu\u1eadn.<\/strong><\/p>\n

Hi\u1ec7n nay, ng\u01b0\u1eddi xem cho th\u1ea5y h\u1ecd th\u00fa v\u1ecb v\u1edbi vi\u1ec7c xem c\u00e1c n\u1ed9i dung 3D. K\u1ef9 thu\u1eadt n\u00e0y hi\u1ec7n \u0111ang \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u00e0 l\u00e0m h\u1eadu k\u1ef3 theo qui tr\u00ecnh s\u1ed1 h\u00f3a, do \u0111\u00f3 n\u1ed9i dung l\u00e0 d\u1eef li\u1ec7u s\u1ed1. C\u00e1c nh\u00e0 qu\u1ea3ng b\u00e1 \u0111ang c\u1ed1 g\u1eafng t\u1eadn d\u1ee5ng s\u1ee9c h\u1ea5p d\u1eabn c\u1ee7a n\u1ed9i dung 3D (d\u1eef li\u1ec7u s\u1ed1) \u0111\u1ec3 thu h\u00fat kh\u00e1ch h\u00e0ng b\u1eb1ng c\u00e1ch ph\u00e2n ph\u1ed1i 3DTV tr\u00ean c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn kh\u00e1c nhau nh\u01b0 v\u1ec7 tinh, c\u00e1p, m\u1ea1ng IP, v\u00e0 m\u1eb7t \u0111\u1ea5t (t\u1ea5t nhi\u00ean l\u00e0 ph\u00e1t s\u00f3ng s\u1ed1).
\n M\u1eb7c d\u00f9, k\u1ef9 thu\u1eadt 3DTVv\u1eabn ch\u1ec9 \u0111ang \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m v\u00e0 nhi\u1ec1u th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh c\u1ee5 th\u1ec3. Tuy nhi\u00ean t\u1ed1c \u0111\u1ed9 bit c\u1ee7a d\u1ecbch v\u1ee5 3DTV v\u1eabn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3 \u0111\u1ecbnh d\u1ef1a tr\u00ean m\u1ed9t s\u1ed1 th\u00f4ng s\u1ed1 ch\u1ecdn l\u1ef1a. T\u1ed1c \u0111\u1ed9 d\u1ecbch v\u1ee5 3DTV \u01b0\u1edbc t\u00ednh trong b\u00e0i vi\u1ebft n\u00e0y l\u00e0 13 Mbps, v\u00e0 s\u1ed1 d\u1ecbch v\u1ee5 3DTV c\u00f3 th\u1ec3 cung c\u1ea5p trong m\u1ed9t\u00a0gh\u00e9p k\u00eanh c\u1ee7a m\u1ea1ng m\u1eb7t \u0111\u1ea5t l\u00e0 3 d\u1ecbch v\u1ee5. Tuy nhi\u00ean, nh\u1eefng \u01b0u th\u1ebf khi chuy\u1ec3n t\u1eeb n\u1ed9i dung 2D sang 3D v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u nh\u1ea5t l\u00e0 kh\u1ea3 n\u0103ng t\u1eadn d\u1ee5ng hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng k\u00eanh khi k\u1ef9 thu\u1eadt truy\u1ec1n d\u1eabn \u0111\u01b0\u1ee3c n\u00e2ng c\u1ea5p t\u1eeb DVB-T l\u00ean DVB-T2. \u0110\u00e2y l\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u1ea7n \u0111\u01b0\u1ee3c kh\u1ea3o s\u00e1t trong th\u1eddi gian \u0111\u1ebfn.<\/p>\n

Trong c\u1ea5u tr\u00fac ph\u00e1t s\u00f3ng, vi\u1ec7c chuy\u1ec3n sang n\u1ed9i dung 3D s\u1ebd g\u1ed3m nhi\u1ec1u b\u1ed9 encoder m\u1edbi (c\u00f3
\n th\u1ec3 h\u1ed7 tr\u1ee3 t\u01b0\u01a1ng th\u00edch 2D\/3D). H\u1ec7 th\u1ed1ng truy\u1ec1n d\u1eabn s\u1ebd t\u00ednh t\u1eeb b\u1ed9 gh\u00e9p k\u00eanh, m\u1ea1ng ph\u00e2n ph\u1ed1i v\u00e0 ph\u00e1t s\u00f3ng m\u1eb7t \u0111\u1ea5t l\u00fac n\u00e0y s\u1ebd kh\u00f4ng quan t\u00e2m \u0111\u1ebfn \u0111\u00f3 l\u00e0 n\u1ed9i dung 2D hay 3D. DVB-T ho\u1eb7c DVB-T2 v\u1eabn \u0111ang c\u00f3 nh\u1eefng c\u1ea3i ti\u1ebfn li\u00ean t\u1ee5c v\u00e0 \u0111i\u1ec1u n\u00e0y s\u1ebd c\u00e0ng gia t\u0103ng kh\u1ea3 n\u0103ng ph\u00e2n ph\u1ed1i n\u1ed9i dung 3D \u0111\u1ebfn ng\u01b0\u1eddi xem. Gi\u1ea5c m\u01a1 v\u1ec1 3DTV c\u00f3 l\u1ebd s\u1ebd x\u1ea3y ra nhanh trong th\u1eddi gian \u0111\u1ebfn v\u00e0 s\u1ebd \u0111\u01b0\u1ee3c truy\u1ec1n d\u1eabn theo ti\u00eau chu\u1ea9n DVB-T2 \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng truy\u1ec1n m\u1eb7t \u0111\u1ea5t.<\/p>\n


<\/p>\n","protected":false},"excerpt":{"rendered":"

Trong b\u1ed1i c\u1ea3nh ng\u00e0y c\u00e0ng xu\u1ea5t hi\u1ec7n nhi\u1ec1u k\u00eanh truy\u1ec1n h\u00ecnh s\u1ed1 m\u1edbi v\u1edbi s\u1ef1 \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,74,1,81],"tags":[],"yoast_head":"\nTri\u1ec3n khai truy\u1ec1n h\u00ecnh 3D tr\u00ean c\u00f4ng ngh\u1ec7 DVB-T2 - Blog SNT - C\u00f4ng Ty TNHH Si\u00eau Nh\u1eadt Thanh - Sao Nhanh Th\u1ebf<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/snt.com.vn\/blog\/tri\u1ec3n-khai-truy\u1ec1n-hinh-3d-tren-cong-ngh\u1ec7-dvb-t2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tri\u1ec3n khai truy\u1ec1n h\u00ecnh 3D tr\u00ean c\u00f4ng ngh\u1ec7 DVB-T2 - 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