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Audio Preamp with AGC and Feedback to Improve …
https://www.arrl.org/files/file/Technology/tis/info/pdf/9711036.pdf
Preamp AGC is also known as audio compression. It differs slightly from ALC, however, because AGC not only reduces the amplitude of loud sounds; it actively amplifies soft sounds. Audio compressors (and AGC) differ from audio processors, which increase audio power by using very short time constants to reduce voice peaks.
Audio Preamp with AGe and Feedback to Improve AM Fidelity
http://hourofthetime.com/lib/Bill%20Cooper/Northridge%20Facility/Audio%20Preampe%20with%20AGC%20and%20Feedback%20to%20improve%20AM%20Fidelity.pdf
Preamp auto matic gain control (AGC) works as well as A VC (automatic volume control) in any re ceiver. Preamp AGC is similar to the nuto matic level control (ALC) in a modem trans-.-miller; it helps avoid overdrive. Preamp AGC is also known as audio compression. It dif fers slightly from ALC, however, because
AN-1451LM4935 Automatic Gain Control (AGC) Guide
https://www.ti.com/lit/an/snaa028a/snaa028a.pdf
ADC AGC MIC MIC PREAMP Automatic Gain Control (AGC) Overview www.ti.com 1 Automatic Gain Control (AGC) Overview A microphone is typically used in an environment where the level of the audio source is unknown. The LM4935 features an Automatic Gain Control (AGC) circuit that addresses this situation by compensation
MAX9814 Microphone Amplifier with AGC and Low-Noise ...
https://www.maximintegrated.com/en/products/analog/audio/MAX9814.html
The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry. The low-noise preamplifier has a fixed 12dB gain, while the VGA ...
Simple Microphone Preamp with AGC | diyAudio
https://www.diyaudio.com/community/threads/simple-microphone-preamp-with-agc.69697/
I am looking for a simple preamp circuit with AGC to boost the output from an electret microphone to something like line level (or even a bit higher). It's going to be part of a sound-to-light type unit, so audio quality isn't a key criteria. I need AGC because the circuit will had to adapt to different ambient sound levels without intervention.
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