Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1980-05-29
1983-03-15
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330126, 330138, 333 14, H03G 320, H04B 328
Patent
active
043769160
ABSTRACT:
An improved system for compressing or expanding the dynamic range of an electrical input signal of the type which includes a variable gain device for controlling the gain of the input signal and a circuit for generating a control signal for the variable gain device including a rectifier for producing responsively to the input signal a DC signal which substantially follows dynamic variations of the input signal. The improvement resides in the provision in the control signal generating circuit of a network of at least three signal paths having a common input terminal connected to receive the DC signal and a common output terminal connected to the variable gain device for coupling a control signal thereto, which signal paths have differing time constants and are automatically selectable as a function of the rate and amount of change in amplitude of the DC signal.
REFERENCES:
patent: 3665345 (1972-05-01), Dolby
patent: 3798562 (1974-03-01), Takahashi
patent: 4220929 (1980-09-01), Talbot et al.
CBS Inc.
Mullins James B.
Olson Spencer E.
Wan Gene
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