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digital_television [2017/11/14 09:18] – [디지털 플랫폼: 물리적 경로] hkimscildigital_television [2022/10/18 08:30] (current) – [Analog Television] hkimscil
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-====== Dital Broadcasting -- IPTV and all others ====== +====== Analog Television ====== 
-reference{{:databroadcastetri.pdf|ETRI 보고서}} PDF+^ ^ NTSC  ^ PAL  ^ 
 +| stands for   | National Television System Committee  | Phase Alternation by Line  | 
 +| Bandwidth  | 6 MHz  | 7 to 8 MHz  | 
 +| Vertical Freq  | 60 Hz  | 50 Hz  | 
 +| Horizontal Frequency  | 15.734 kHz  | 15.625 kHz  | 
 +| Lines  | 525 (480)  | 625 (576)  | 
 +| Field per sec. | 60  | 50  | 
 +| Frame((Analog TVs use a cathode-ray tube (CRT) to beam light against the backside of a screen. These tubes aren’t like projectors—they can’t fill up a screen in one go. Instead, they quickly beam light down from the top of a screen. As a result, though, the picture at the top of the screen starts to fade as the CRT beams light at the bottom of the screenfrom https://www.howtogeek.com/428987/whats-the-difference-between-ntsc-and-pal/)) per sec. | 30  | 25  |
  
-Analog to Digital  +{{https://static.diffen.com/uploadz/thumb/f/ff/PAL-NTSC.svg/610px-PAL-NTSC.svg.png}}
-| A  |  D  | 비고 +
-| terrestrial broadcast (TB)  | digital TB   | free . . . \\  cf[[wp>Aereo|Aereo antenna]]   | +
-| CA  | @lightgreen: Digital CA  | 통신사 + 케이블 회사 \\ mobile + internet + tv + \\ music + tv/movie content service \\  \\ PP (TB 포함)와 함께 subscribers 확보 +
-| <del>satellite</del>  | @lightgreen: Satellite television  | :::  | +
-|   | @lightgreen: IPTV  | :::  |+
  
-즉, 어떤 contents를 어떻게 전달할 것인가가 앞으로의 과제 +see also https://www.diffen.com/difference/NTSC_vs_PAL
-  * customization +
-  * connected TV+
  
-[[wp>Aereo|Aereo antenna]] . . .  
  
 +====== Dital Broadcasting -- IPTV and all others ======
 +reference. {{:databroadcastetri.pdf|ETRI 보고서}} PDF
  
 Conversion of analogue television signals to digital signals -> __sampling__ Conversion of analogue television signals to digital signals -> __sampling__
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     * robust signals      * robust signals 
     * uses **less bandwidth**     * uses **less bandwidth**
-  * sending information +그러나 영상 외에도 필요해지는 것 
 +  * sending (and receiving) information 
     * via one channel: one-way channel, broadcast channel, forward path, or in-band channel, etc.     * via one channel: one-way channel, broadcast channel, forward path, or in-band channel, etc.
     * via two channel: two-way channel, interactional channel, **return path**, back channel or out-of-band channel, etc.     * via two channel: two-way channel, interactional channel, **return path**, back channel or out-of-band channel, etc.
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   * GEM (Globally Executable MHP)   * GEM (Globally Executable MHP)
     * MHP에서 유럽 방송환경에만 쓰이는 요소를 제거하여 OCAP과 ACAP에 이용하기 용이하도록 한 표준임.     * MHP에서 유럽 방송환경에만 쓰이는 요소를 제거하여 OCAP과 ACAP에 이용하기 용이하도록 한 표준임.
-  * OCAP (OpenCableApplication Platform)+  * OCAP (Open Cable Application Platform)
     * 미국 케이블 방송 기구인 Cable Labs에서 제정한 양방향 TV 미들웨어 표준     * 미국 케이블 방송 기구인 Cable Labs에서 제정한 양방향 TV 미들웨어 표준
     * GEM에 Open Cable의 환경적인 요소를 추가하는 식으로 제정     * GEM에 Open Cable의 환경적인 요소를 추가하는 식으로 제정
digital_television.1510620503.txt.gz · Last modified: 2017/11/14 09:18 by hkimscil

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