Adaptive audio compressor

Details Adaptive audio compressor Adaptive audio compressor

1978-06-14

1980-08-05

Griffin, Robert L.

Telecommunications

Transmitter

Carrier frequency stabilization

328168, 307237, 328175, 307264, 333 14, H04B 104, H03B 302

Patent

active

042164273

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: 3249871 (1966-05-01), Duncan, Jr.
patent: 3422356 (1969-01-01), Fritts
patent: 3866146 (1975-02-01), Augustin et al.
patent: 3943446 (1976-03-01), Quidort
patent: 3988694 (1976-10-01), Yamazaki
patent: 4088956 (1978-05-01), Axman

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