Image signal average picture level detecting apparatus

Details Image signal average picture level detecting apparatus Image signal average picture level detecting apparatus

1991-07-10

1993-06-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 39, 358168, 358172, 307494, H04N 927, H04N 5235, H04N 557, H04N 518

Patent

active

052239276

ABSTRACT:
The average picture level (APL) of a video luminance signal is detected, wherein the output of a first current mirror circuit used as the load of a differential amplifying circuit is fed into a smoothing circuit via a second current mirror circuit. The direct current voltage of the output and the detection voltage amplitude may be optionally set without causing an offset voltage in the output average picture level voltage, with the current flowing through the second current mirror circuit being made zero at the time of APL=0%.

REFERENCES:
patent: 3569620 (1974-03-01), Baun
patent: 4338527 (1982-07-01), Nagano
patent: 4340904 (1982-07-01), Wingrove, Jr.
patent: 4543614 (1985-09-01), Chen
patent: 4691235 (1987-09-01), Okui et al.
patent: 5162902 (1992-11-01), Bell et al.

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