digital_television
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| digital_television [2020/11/06 21:34] – hkimscil | digital_television [2024/12/05 08:55] (current) – hkimscil | ||
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| ====== Analog Television ====== | ====== Analog Television ====== | ||
| - | ^ ^ NTSC ^ PAL ^ | + | ^ ^ [[:NTSC]]((see http:// |
| | stands for | National Television System Committee | | stands for | National Television System Committee | ||
| | Bandwidth | | Bandwidth | ||
| | Vertical Freq | 60 Hz | 50 Hz | | | Vertical Freq | 60 Hz | 50 Hz | | ||
| | Horizontal Frequency | | Horizontal Frequency | ||
| - | | Lines/ | + | | Lines | 525 (480) | 625 (576) | |
| - | | Field per sec. | 60 | 50 | | + | | Fields |
| - | | Frame per sec. | 30 | 25 | | + | | 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:// |
| {{https:// | {{https:// | ||
| + | |||
| + | see also https:// | ||
| ====== Dital Broadcasting -- IPTV and all others ====== | ====== Dital Broadcasting -- IPTV and all others ====== | ||
| reference. {{: | reference. {{: | ||
| - | |||
| - | Analog to Digital | ||
| - | | A | D | 비고 | ||
| - | | terrestrial broadcast (TB) | digital TB | free . . . \\ cf. [[wp> | ||
| - | | CA | @lightgreen: | ||
| - | | < | ||
| - | | | @lightgreen: | ||
| - | |||
| - | 즉, 어떤 contents를 어떻게 전달할 것인가가 앞으로의 과제. | ||
| - | * customization | ||
| - | * connected TV | ||
| - | |||
| - | [[wp> | ||
| - | |||
| Conversion of analogue television signals to digital signals -> __sampling__ | Conversion of analogue television signals to digital signals -> __sampling__ | ||
| Line 38: | Line 26: | ||
| * 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. | ||
| Line 93: | Line 82: | ||
| * 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 | ||
| * ACAP (Advanced Common Application Platform) | * ACAP (Advanced Common Application Platform) | ||
| Line 107: | Line 97: | ||
| * 거래형 양방향 TV 서비스를 위해서 복잡한 매체별 사업 관계 | * 거래형 양방향 TV 서비스를 위해서 복잡한 매체별 사업 관계 | ||
| ---- | ---- | ||
| - | * [[:DVB]] | + | * [[: |
| * [[:MHP]] | * [[:MHP]] | ||
| * [[:ATSC]]: Advanced Television Systems Committee | * [[:ATSC]]: Advanced Television Systems Committee | ||
digital_television.1604666053.txt.gz · Last modified: 2020/11/06 21:34 by hkimscil