Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1980-11-24
1983-08-09
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330138, 330279, 333 14, H03G 700
Patent
active
043981585
ABSTRACT:
A dynamic range expander which substantially limits the amount of positive expansion without affecting the amount of negative expansion is disclosed. In one arrangement, gain reduction in the amplitude of the output signal is increased when the amplitude of the input signal decreases toward or becomes less than the noise level present in the input signal. The dynamic range expander includes a detector (24) for sensing the amplitude of the input signal and providing a variable DC signal related to the amplitude of the input signal, a control signal generator (30) and an amplifier (34) for amplifying the input signal by a gain variable responsively to the output of the control signal generator. The control signal generator includes a time averager (50) and a summer (40) for providing a second variable DC signal related to the sum of the detector output and the time averaged detector output. The control signal generator further includes a precision clamp (56) for clamping the control signal, thereby limiting the amount of positive expansion of the input signal.
REFERENCES:
patent: 2948860 (1960-08-01), Affelder
patent: 3681618 (1972-08-01), Blackmer
patent: 3789143 (1974-01-01), Blackmer
"Signetics Compandor Mini-Manual", NE570/571 Monolithic Dual Compressor/Expandor, pp. 3-16.
"DBX Model 3 BX 3 Band Dynamic Range Extender Instruction Manual".
Micmix Audio Products, Inc.
Mullins James B.
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