Adaptive audio compressor

Telecommunications – Transmitter – Carrier frequency stabilization

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Adaptive audio compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive audio compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive audio compressor will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2282174

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.