Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent
1984-02-02
1985-12-31
Dwyer, James L.
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
333 14, H03G 700
Patent
active
045625913
ABSTRACT:
A digital dynamic range converter of the forward control type for varying the dynamic range of a digital audio signal constituted by a sequence of audio signal samples. Each audio signal sample x(n) is multiplied by a control signal sample s(n) which is delivered by a digital control signal generator. This control signal generator has applied to it unipolar signal samples x(n) which are derived via a transmission channel from the audio signal samples x(n). In order to cause this dynamic range converter to respond rapidly to abrupt variations in the audio signal and to render it moreover universally usable, the control signal generator is provided with a digital peak-value detector which converts the sequence of unipolar signal samples x(n) into a sequence of peak-value samples x(n). The latter are applied to a digital non-linear amplitude transformation circuit which has an adjustable amplitude transmission characteristic curve determined by adjustment quantities R and a. It delivers the transformation samples s(n) which are preferably converted in a digital low-pass filter into the control signal samples s(n) which are applied to the multiplier device.
REFERENCES:
patent: 4071695 (1978-01-01), Flanagan et al.
Briody Thomas A.
Dwyer James L.
Rich Marianne
Streeter William J.
U.S. Philips Corporation
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