Apparatus and method for processing television picture signals a

Details Apparatus and method for processing television picture signals a Apparatus and method for processing television picture signals a

1981-11-10

1984-03-27

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375118, 370100, 370108, H04N 504

Patent

active

044397860

ABSTRACT:
A problem arises when simultaneous attempts are made to write and read from the same location in a random access memory. The invention deals with this problem by delaying the writing operations automatically by a varying amount to prevent attempts at simultaneous writing and reading: and preferably to position each write operation approximately mid-way between two read operations.
The invention is particularly applicable to a television synchronizer. In a television synchronizer video information is digitized and then fed into a memory by write clock signals derived from the video information, e.g. from its line synchronizing pulses. It is fed out of the memory by read clock signals derived from some other source.
The invention is also applicable to standards conversion systems, noise reduction systems and picture size reduction and expansion systems.

REFERENCES:
patent: 3188569 (1965-06-01), Mahony
patent: 3351858 (1967-11-01), Jowett et al.
patent: 3860952 (1975-01-01), Tallent et al.
patent: 4018990 (1977-04-01), Long et al.
patent: 4056851 (1977-11-01), Hovagimyan et al.
patent: 4058682 (1977-11-01), Donne et al.
patent: 4208713 (1980-06-01), Berg

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