Transmission of audio in a video signal

Details Transmission of audio in a video signal Transmission of audio in a video signal

1988-10-14

1991-01-08

Shoop, Jr., William M.

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

341 76, 358145, H03M 100, H04N 900

Patent

active

049839675

ABSTRACT:
A method of encoding an audio signal onto and decoding an audio signal from a video signal wherein, in the encoding stage, successive portions of the audio signal are sampled, time compressed and inserted in analogue form into predetermined lines in the vertical interval of each field of the video signal. Also, distortion cancelling signals (which are generated as inverted forms of the time compressed audio signal portions) are inserted in analogue form into further predetermined lines in the vertical interval of each field of the video signal. In the subsequent decoding stage, the successive audio signal portions and the distortion cancelling signals are separated from the video signal, and associated ones of the audio signal portions and the distortion cancelling signals are added after inverting either the audio signal portions or the distortion cancelling signals in order that any perturbation present in both signals will cancel to zero. Thereafter, the resultant signal portions are time expanded and re-assembled.

REFERENCES:
patent: 3819852 (1974-06-01), Wolf
patent: 4156253 (1979-05-01), Steudel
patent: 4266243 (1981-05-01), Shutterly
patent: 4414536 (1983-11-01), Sumi
patent: 4752953 (1988-06-01), Paik et al.

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