Electrical audio signal processing systems and devices – Noise or distortion suppression – Peak limiting or pulsive noise compensation
Patent
1997-01-02
1999-04-13
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Peak limiting or pulsive noise compensation
381107, 330284, H03G 300, H04B 1500
Patent
active
058945229
ABSTRACT:
A distortion reduction system for an audio device having first and second power supply voltages, a driver circuit for amplifying an audio signal, and, a speaker for outputting the amplified audio signal, allows a speaker driver system to increase significantly its average acoustic output power without appreciably degrading the audio signal quality. The system performs this function independently of the power supply voltage value by detecting a voltage difference between instantaneous peak amplified audio signal value and each first and second power supply voltage values and, providing a first gain control signal to the driver circuit when the detected difference is greater than a predetermined trigger level value, and a second gain control signal to the driver circuit when the detected difference is less than the predetermined trigger level value. In this system, the first and second gain control signals operate to maximally maintain the amplified peak-to-peak audio signal values between power supply voltage limit values and prevent onset of audio signal distortion while maximizing the average RMS value.
REFERENCES:
patent: 4199723 (1980-04-01), Cummings et al.
patent: 4605910 (1986-08-01), Covill
patent: 4689819 (1987-08-01), Killion
patent: 4737731 (1988-04-01), Swanson et al.
Isen Forester W.
Lucent Technologies - Inc.
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