Television – Bandwidth reduction system – Multiple channel
Patent
1996-08-08
1999-07-13
Chin, Tommy P.
Television
Bandwidth reduction system
Multiple channel
348426, 348384, 348385, 348470, H04N 712
Patent
active
059233745
ABSTRACT:
A system for reducing bandwidth of video signals. Ordinarily, an NTSC (National Television Standards Committee) video signal has (a) a bandwidth of 6.0 MHz, (b) chrominance and luminance carriers separated by about 3.58 MHz, and (c) an audio carrier located at the upper end of the 6.0 MHz bandwidth. The invention reduces the separation between chrominance and luminance carriers to about 2.15 MHz, and decreases the bandwidth to about 4.0 MHz. In addition, the invention moves the audio carrier outside the 4.0-MHz bandwidth. The invention allows multiple channels, of 4.0 MHz bandwidth each, to be placed adjacent each other in a cable television spectrum, and the audio signals of the channels to be placed together, at the upper end of the spectrum, outside the range allocated to the video information. A larger number of channels is obtained than would otherwise be available, because the upper end of the spectrum is not suitable for carrying video information, but will handle audio information.
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Chin Tommy P.
Lucent Technologies - Inc.
Philippe Gims
Welte Gregory A.
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