Television transmission system having improved separation of aud

Details Television transmission system having improved separation of aud Television transmission system having improved separation of aud

1988-09-01

1990-07-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358141, 358143, H04N 704

Patent

active

049438492

ABSTRACT:
Improved separation of audio and video spectra carried upon spectrally separated audio and video carriers within a television transmission channel leading to a television receiver is realized in a method which includes the transmission steps of: obtaining a high frequency luminance component at the vicinity of the audio carrier offset from the video carrier from a full bandwidth baseband luminance signal received from a video source; limiting the amplitude of luminance energy groups within the high frequency component to be below a predetermined amplitude level; combining the amplitude limited high frequency component into the full bandwidth luminance signal in a manner which provides a composite luminance signal having amplitude limited high frequency energy groups at the vicinity of the audio carrier; adding video synchronizing information to the composite luminance signal to provide a signal video modulation signal; modulating said video carrier with said single video modulation signal; combining the video carrier with the audio carrier into a resultant television composite; and, passing the resultant television composite through the television transmission channel to the television receiver. The method further includes making the audio carrier phase coherent with picture synchronizing information thereby enabling interleave of high frequency video and audio energies. Comb filter separation of video from audio energy groups may then be employed at the receiver.

REFERENCES:
patent: 4553162 (1985-11-01), Peel

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