Method and apparatus for reduced-bandwidth transmission of...

H - Electricity – 04 – N

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H04N 7/06 (2006.01) H04N 7/12 (2006.01) H04N 7/15 (2006.01)

Patent

CA 2208947

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. O-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.

Système permettant de réduire la bande passante de signaux vidéo. Ordinairement, un signal vidéo NTSC (National Television Standards Committee) a (a) une bande passante de 6,0 MHz, (b) des porteuses de chrominance et de luminance séparées d'environ 3,58 MHz, et (c) une porteuse audio située à l'extrémité supérieure de la bande passante de 6,0 MHz. L'invention réduit la séparation entre les porteuses de chrominance et de luminance à environ 2,15 MHz, et ramène la bande passante à environ 4,0 MHz. En outre, l'invention déplace la porteuse audio à l'extérieur de la bande passante de 4,0 MHz. Elle permet de juxtaposer des canaux multiples, ayant chacun une bande passante de 4,0 MHz, dans un spectre de télévision par câble, et de regrouper les signaux audio des canaux à l'extrémité supérieure du spectre, à l'extérieur de la plage attribuée à l'information vidéo. On obtient ainsi un nombre de canaux beaucoup plus grand qu'on ne le pourrait autrement, parce que l'extrémité supérieure du spectre ne convient pas pour la transmission d'information vidéo, mais peut convenir pour l'information audio.

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