Transient control aspects of circuit arrangements for altering t

Details Transient control aspects of circuit arrangements for altering t Transient control aspects of circuit arrangements for altering t

1986-03-03

1990-05-01

Harkcom, Gary V.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

381106, 333 14, H04B 166, H03G 700

Patent

active

049225359

ABSTRACT:
In circuits for generating rapidly changing, yet smooth and controlled, control signals in response to transient signals for use in audio compressors and expanders, a steady-state portion of the control circuit includes first and second smoothing stages (alternatively, a single stage may be employed) and an overshoot suppression portion of the control circuit rapidly charges the capacitor in the steady-state smoothing stage from which the control voltage is derived. A first additional overshoot suppression circuit provides further charging of the capacitor in response to low frequency signal components. Modulation control signals, which make the compressor or expander less susceptible to control by stop-band signal components, are combined in opposition to the signals in the steady-state and overshoot suppression portions of the control circuit. A further overshoot suppression circuit provides additional charging of the capacitor in order to compensate in certain cases for the use of modulation control signals.

REFERENCES:
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patent: 3846719 (1974-11-01), Dolby
patent: 3903485 (1975-09-01), Dolby
patent: 4072914 (1978-02-01), Haramoto et al.
patent: 4319205 (1982-03-01), Scholz
patent: 4490691 (1984-12-01), Dolby
patent: 4498055 (1985-02-01), Dolby
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Dolby A-type circuit description, published in the early 1970's.
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