Image signal processing circuit for producing multiple pictures

Details Image signal processing circuit for producing multiple pictures Image signal processing circuit for producing multiple pictures

1989-05-31

1991-05-14

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, 358 22, 358181, H04N 5262, H04N 5268, H04N 974

Patent

active

050161067

ABSTRACT:
There is disclosed an image processing circuit for displaying a plurality of sub-pictures which have different image signal sources on a common screen. The inventive subject digitalizes an original image analog signal by use of a corresponding sampled signal upon a multiple picture processing, saves the digitalized data almost simultaneously, and uses a dual-port memory for reading the data, whereby the circuit simplifies the generating process of a control timing signal and renders the PIP process easy to carry out, when controlling the dual-port memory by read-write operation. The apparatus for carrying out the invention includes a keyboard or remocon for data input/output, a microcomputer for controlling the entire process, a controller for controlling display processes, an analog switching device, an A/D converter for converting the analog signal to a digital signal, a dual-port memory for dealing with various image signals, and three D/A converters for converting digital data to analog data.

REFERENCES:
patent: 4729027 (1988-03-01), Hakamada et al.
patent: 4729028 (1988-03-01), Micic et al.
patent: 4814884 (1989-03-01), Johnson et al.
patent: 4835613 (1989-05-01), Johnson
patent: 4855833 (1989-08-01), Kageyama et al.

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