Amplifier circuit operative with an adaptive signal compression

Details Amplifier circuit operative with an adaptive signal compression Amplifier circuit operative with an adaptive signal compression

1986-11-07

1988-07-12

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358166, H04N 510, H04N 964

Patent

active

047573732

ABSTRACT:
The circuit has a gain factor characteristic curve with various breakpoints below which and above which a larger or a smaller gain factor, respectively, is present. Both the breakpoints and the gain factors above these points are variable dependent on the magnitude of the input signal. For picture signal processing for which the signal values below the breakpoints reach the output signal in an optimum way and above which an optimum adaptive white signal compression is present, the circuit is formed with a signal multiplier circuit (2) for multiplying a picture voltage (VI) and a first direct voltage (Va) by a control voltage (VR), and with a signal minimum detection circuit (4) for passing the lowest voltage value when the said picture voltage (VI) is applied relative to the voltage originating from the signal multiplier circuit (2) and relative to a second direct voltage (Vb), with the control voltage (VR) being derived from the voltage value that has been passed.

REFERENCES:
patent: 4245237 (1981-01-01), Lagoni
patent: 4388647 (1983-06-01), Harwood et al.
patent: 4394744 (1983-07-01), Wrench, Jr.
patent: 4623924 (1986-11-01), Wargo et al.
patent: 4639781 (1987-01-01), Rucci et al.

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