Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent
1982-03-04
1984-06-19
Pellinen, A. D.
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
381108, H03G 700
Patent
active
044556764
ABSTRACT:
A speech processor having microprocessor control of the amplitude level of input speech signals. Input speech signals are applied to a digitally controlled level regulator, the output of which is converted into a digital speech signal for further speech processing. The peak level of the digital speech signals over a frame period is compared in the microprocessor with a preset optimum range. If the peak level falls outside the optimum range, control signals for the level regulator are adjusted in a direction to change the amplification/attenuation amount of the level regulator to bring the peak level within the optimum range.
REFERENCES:
patent: 3187323 (1965-06-01), Flood et al.
patent: 4016557 (1977-04-01), Zitelli et al.
patent: 4070709 (1978-01-01), Roberts et al.
Dwyer James L.
Nippon Electric Co. Ltd.
Pellinen A. D.
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