Three Tips about What Is Control Cable You can use Today > 자유게시판

• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

See HBI; VBI. NTSC: Acronym for National Television Standards Committee (or Never The same Color, should you desire :-) Picture Signal: The 52.46 microseconds of sign following the control sign. Control Signal: The primary 11.1 microseconds of a line of NTSC video. Having a small buffer area between the control sign information and the image info is a "fudge factor" to compensate for the truth that real-life things that do not all the time work as nicely as they do on paper. Information in this space is between zero and a hundred IRE units. See IPPV. Set-up Level: Picture data technically has barely less than one hundred IRE models available. See IRE Units; Set-up Level. The realm from zero to 7.5 IRE units are reserved for what is usually called the "set-up stage". That's because image info begins at 7.5 IRE items relatively than at 0 IRE units. Instead of referring to the video level in volts, IRE items are used instead. The signal area from 0 to 0.3 volts (-40 to zero IRE units) is reserved for control indicators, the rest for picture data. If the signal is at 0.3 volts (or 0 IRE) the image might be black. See IRE Units. VBI: Acronym for Vertical-Blanking Interval.

See Field; Line. FSK: Acronym for Frequency Shif Keying. An IRC (Incrementally Related Carrier) system, all channels are at their normal frequency aside from channels 5 and 6, which shall be 2 MHz increased than regular. The following chart lists frequency info for the "commonplace" provider sets. Some older Tv sets can't obtain any channels besides 5 and 6 on an HRC system, and cannot receive channels 5 and 6 on an IRC system. Unfortunately, random video inversion remains to be a problem, as are colour shifts which happen from distorted or clamped colorburst alerts, and many others. Most people have not had very good results from the system, even after incorporating some modifications. In an HRC (Harmonically Related Carrier) system, all picture service frequencies are derived from a 6 MHz oscillator, so all channels except 5 and 6 will be 1.25 MHz decrease than standard. Converter: A gadget, sometimes issued by the cable firm, to "convert" many Tv channels to 1 specific channel (often channel 3). Used early-on when VHF & UHF channels had been on different dials (and earlier than remote controls) to offer "comfort" to cable prospects. The presence of a PPV movie channel or your system guarantees you could have addressable converters.

A income-enhancing system where buyer's pay to watch a movie or occasion on a "per view" basis. Cusomers usually place a phone name to a special quantity and order the event of their choice; some methods provide Impulse PPV. Since numerous scrambling methods rely on messing with the horizontal sync pulse to scramble the picture, the Universal Descrambler attempts to use the colorburst sign to help it substitute the tainted sync pulse. Addressable cable methods normally send there control information using this methodology. The primary 11.1 microseconds make up the horizontal blanking interval, or control signal, the next 52.46 microseconds make up the image sign. In a standard line of NTSC video, the colorburst is 8 to eleven cycles of a 3.579545 MHz clock (that comes out to 2.31 microseconds) which follows the 4.71 microsecond horizontal sync through the horizontal blanking interval. It contains the entrance porch, the 4.71 microsecond horizontal sync pulse, the 2.31 microseconds of colorburst, and the back porch.

The first area comprises the odd numbered traces, the second subject accommodates the even numbered lines. A frame lasts 1/thirtieth of a second. Each discipline takes 1/60th of a second to transmit. Since the NTSC customary is 525 traces, each discipline incorporates 262.5 lines--due to this fact it's the half-line that permits the 2 fields of a frame to be distinguished from each other. Note that both fields comprise a whole vertical-blanking interval they usually each (ought to) have the same information throughout that interval. See Frame; Line. Frame: An NTSC video signal which contains both fields. A separate colorburst signal is sent for each line of video, and are all exactly in phase (to prevent color shifts). The primary 11.1 microseconds of a line of video. The shade NTSC normal allows a complete time of 63.56 microseconds for every line, and each body is composed of 525 lines of video info. See Colorburst. Interlace: Term used to explain the twin-subject approach used within the NTSC standard. The Universal Descrambler relies on the presence of the colorburst for its reference signal. In May of 1990, Radio-Electronics magazine printed an article on constructing a universal descrambler for decoding scrambled Tv indicators.