Adaptive audio compressor

Details Adaptive audio compressor Adaptive audio compressor

1976-03-25

1978-08-29

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307237, 307264, 325144, 328175, 330284, 333 14, H03B 302, H03K 114

Patent

active

041106997

ABSTRACT:
An amplitude modulated transmitter includes an audio amplifier which, via a radio frequency (RF) power supply modulator, modulates an RF amplifier and carrier. Fluctuations in the direct current DC bias to the RF amp, such as are common in mobile applications, vary the modulation index of the transmitted signal.
To minimize DC bias affects on the modulation index, the invention contemplates an audio compressor which senses both audio signal level and DC bias level and, in response thereto, controls audio signal compression to maintain the desired percent modulation. Compression is effected by changing the bias on a semiconductor device which, in turn, attenuates audio signals at the input of a fixed gain audio amplifier. A feedback path around the audio amplifier senses both DC voltage and audio signal level and produces an appropriate control signal to bias the semiconductor device, thereby altering audio compression.

REFERENCES:
patent: 3988694 (1976-10-01), Yamazaki

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