digital_television
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digital_television [2017/11/14 09:18] – [디지털 플랫폼: 물리적 경로] hkimscil | digital_television [2022/10/18 08:30] (current) – [Analog Television] hkimscil | ||
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- | ====== | + | ====== |
- | reference. {{:databroadcastetri.pdf|ETRI 보고서}} PDF | + | ^ ^ NTSC ^ PAL ^ |
+ | | stands for | National Television System Committee | ||
+ | | Bandwidth | ||
+ | | Vertical Freq | 60 Hz | 50 Hz | | ||
+ | | Horizontal Frequency | ||
+ | | 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 screen. from https://www.howtogeek.com/ | ||
- | Analog to Digital | + | {{https:// |
- | | A | D | 비고 | + | |
- | | terrestrial broadcast (TB) | digital TB | free . . . \\ cf. [[wp> | + | |
- | | CA | @lightgreen: | + | |
- | | < | + | |
- | | | @lightgreen: | + | |
- | 즉, 어떤 contents를 어떻게 전달할 것인가가 앞으로의 과제. | + | see also https://www.diffen.com/ |
- | * customization | + | |
- | * connected TV | + | |
- | [[wp> | ||
+ | ====== Dital Broadcasting -- IPTV and all others ====== | ||
+ | reference. {{: | ||
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** | ||
- | | + | 그러나 영상 외에도 필요해지는 것 |
+ | | ||
* 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 | + | * OCAP (Open Cable Application |
* 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