Picture-in-picture television receiver

Details Picture-in-picture television receiver Picture-in-picture television receiver

1979-09-11

1981-02-03

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 522

Patent

active

042492130

ABSTRACT:
A picture-in-picture television receiver is disclosed in which a television picture to be inset is compressed at a compression rate of 1
and inset as a small-picture in part of a main television picture or large picture, and a single field memory for small-picture reproduction is provided therein in or from which a video signal can be randomly read and written line by line as a unit. In the single field memory is stored the small-picture video signal line by line by the application of a writing clock in which case the time taken in the writing is less than 1/(n+1) of a horizontal period. Then, from the memory is read the stored small-picture information by the application of a reading clock of n times the frequency of the writing clock during the time that writing is not performed, and supplied to be inset in the main television picture. A small-capacity buffer memory is provided at the prestage or following stage of the field memory to prevent the read/write timing overlap in the field memory irrespective of whether the small-picture and the main television picture are synchronized or not in the transmission systems. Thus, the capacity of the field memory essential for the small-picture is about a half of the conventional one.

REFERENCES:
patent: 4139860 (1979-02-01), Micic et al.
Electronics, pp. 102-106, Sep. 1, 1977.

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