System for superimposing plural television pictures with extent

Details System for superimposing plural television pictures with extent System for superimposing plural television pictures with extent

1986-01-28

1987-12-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5262, H04N 5272

Patent

active

047136952

ABSTRACT:
A television picture superimposing system comprises a video mixer including two variable gain amplifying circuits receiving two input picture signals having a given peak-to-peak amplitude, and an adding circuit for mixing the amplified picture signals into a resulting picture signal. The improvement resides in providing a circuit for deriving a single gain control signal based upon a linear combination of two signals derived respectively from the two input picture signals so that the resulting signal has the given peak-to-peak amplitude. The control signal is respectively applied, via an analog inverting circuit and directly, to gain control inputs of the variable gain amplifying circuits.

REFERENCES:
patent: 4292649 (1981-09-01), Macheboeuf
patent: 4360831 (1982-11-01), Kellar
patent: 4602286 (1986-07-01), Kellar et al.

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