Method and apparatus for encoding audio signals in television sy

Details Method and apparatus for encoding audio signals in television sy Method and apparatus for encoding audio signals in television sy

1977-04-28

1979-04-03

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358116, 358121, H04N 716

Patent

active

041480635

ABSTRACT:
At the television transmitting end, the program audio signals to be encoded are limited to a range of 50 to 7,500 Hz. A 202 KHz signal is modulated by the so-limited audio signal and the resultant upper side-band is heterodyned against an upper side-band derived from modulating the 202 KHz signal by video horizontal drive signals. Only the lower side-band created by the heterodyning process is transmitted. At the receiver, the received single sideband signal is applied to a product detector whose other input receives the output of a horizontal drive oscillator operating in synchronism with the corresponding oscillator at the transmitter. The baseband audio signal is separated from the upper sideband signal at the product detector output by means of a low pass filter.

REFERENCES:
patent: 2567539 (1951-09-01), Aram
patent: 3231818 (1966-01-01), Court
patent: 3813482 (1974-05-01), Blonder
patent: 3824332 (1974-07-01), Horowitz

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