Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-06-22
1986-07-01
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
3581931, H04N 550
Patent
active
045983194
ABSTRACT:
A television synchronous receiver is provided which is capable of greatly reducing the mixture of the carrier chrominance signal, vestigial luminance signal, and carrier sound signal in a lower adjacent channel into the baseband video signal in a desired channel being received. The television synchronous receiver is composed of a synchronous detector for effecting synchronous detection of a television signal by using a Costas loop, and a low-pass filter for filtering an output from the synchronous detector. The receiver also has an A/D converter for converting a baseband video signal contained in an output from the low-pass filter into a digital signal, and a vertical filter for filtering an output video signal spectrum from the A/D converter, and a D/A converter for converting an output from the vertical filter into a video signal, so that, irrespective of the fact that a television broadcast wave contains a lower adjacent channel, the converted luminance signal, carrier chrominance signal, and carrier sound signal of the lower adjacent channel produced by the synchronous detector are prevented from being mixed.
REFERENCES:
patent: 4461035 (1984-07-01), Sakamoto
Appl. Ser. No. 550,221, Sakamoto, Television Synchronous Receiver, Filed: 11/9/83.
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
Toth E. Anne
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