Video camera control circuit averaging control signals each obta

Details Video camera control circuit averaging control signals each obta Video camera control circuit averaging control signals each obta

1984-09-19

1986-11-11

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9093

Patent

active

046225811

ABSTRACT:
An automatic control circuit for a video camera includes an error detecting circuit for detecting and generating error data, a control signal generator supplied with the error data and generating a control signal, and a control circuit supplied with the control signal for controlling a controlled circuit for the video camera; wherein said control signal generator mixes reference correcting data generated from the error data with the control signal thereby to generate a new control signal, and the control signal generator includes a circuit for changing the polarity of the reference correcting data and decreasing the absolute value of the reference correcting data when the error data changes its polarity and a circuit for averaging the plural control signals each of which is generated when the reference correcting data is at its minimum value and the error data changes its polarity, the output of the averaging circuit being the control signal.

REFERENCES:
patent: 4318124 (1982-03-01), Nakamura et al.
patent: 4335397 (1982-06-01), Tamura
patent: 4381520 (1983-04-01), Machida et al.
patent: 4503456 (1985-03-01), Nakamura et al.

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