Television synchronous receiver with phase shifter for reducing

Details Television synchronous receiver with phase shifter for reducing Television synchronous receiver with phase shifter for reducing

1990-06-01

1992-06-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581911, 358188, 455324, H04N 550, H04N 544

Patent

active

051228793

ABSTRACT:
A television receiver includes a baseband 90.degree. phase shifter, an adder, and a phase equalizer. The baseband 90.degree. phase shifter obtains in-phase video signals from the video signals of the I and Q signal blocks. The adder voltage-adds the in-phase video signals together. The phase equalizer corrects phase distortion of an output signal from the adder. The 90.degree. phase shifter has an operating frequency band including at least a received channel and a lower adjacent channel. A video signal is extracted from the phase equalizer.

REFERENCES:
patent: 3421121 (1906-01-01), Burnsweig et al.
patent: 3733565 (1973-05-01), Pierret
patent: 4219812 (1980-08-01), Rittenbach
patent: 4578706 (1986-03-01), Sakamoto
patent: 4633315 (1986-12-01), Kaspekovitz
patent: 4953182 (1990-08-01), Chung
Sybil P. Parker, Electronics and Computers, 2nd ed., McGraw-Hill Book Company, New York, pp. 668-669.

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