Radio receiver speech amplifier circuit

Details Radio receiver speech amplifier circuit Radio receiver speech amplifier circuit

1987-01-07

1988-01-26

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330144, H03G 318

Patent

active

047219238

ABSTRACT:
A speech amplifier circuit increases the maximum perceived loudness at the speaker (412) and reduces distortion at high volume levels without increasing the power consumed by the speech powder amplifier (410). When a low volume is selected by the volume control (414), the microcomputer (418) sets the step attenuator (406) at a correspondingly high attenuation level and the high-pass filter (408) is bypassed. As the volume control (414) is advanced and the speech power amplifier (410) is 12 dB into clipping, the microcomputer (418) activates the high-pass filter (408) and simultaneously steps the gain of the step attenuator (406) by 6 dB.

REFERENCES:
patent: 4147991 (1979-04-01), Ijichi et al.
patent: 4276604 (1981-06-01), Kitamura et al.
Niederjohn, Russell J. and James H. Grotelueschen, "The Enhancement of Speech Intelligibility in High Noise Levels by High-Pass Filtering Followed by Rapid Amplitude Compression", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 4, Aug. 1976, pp. 277-282.

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