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Updated Microphone Transceiver (markdown)

Brumi-2021 2022-10-18 23:25:50 +02:00
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Microphone-Transceiver.md

@ -34,7 +34,10 @@ If you wnat to know the audio codec IC of your device , you do not need to dissa
**Automatic mic Level Control "ALC" (AK4951 sound codec IC) or "Boost" pre-amplifier mic control adjustment (WM8731 audio codec IC) :** (*1)
To avoid mic ADC saturation (and consequently spectrum harmonics radiation), and adapt better to your needs , depending on the mic type sensitivity , and the distance mic-mouth from the speaker , and the user voice loudness ... we should set up the best ALC or Boost option (checking that the mic voice sound Vumeter (left mic volume peak bar indication) is below 80-90% )
To avoid mic ADC saturation (and consequently spectrum harmonics radiation), we introduced ALC and Boost options control.
![image](https://user-images.githubusercontent.com/86470699/196547451-91bc4b30-ae66-4506-b8a8-490d280f79da.png)
With proper adjustment , we can solve that mic ADC saturation, and adapt correctly to our mic gain sensitivity , and the distance mic-mouth from the speaker , and the user voice loudness ... That proper settings , can be done, selecting the best ALC or Boost option (checking that the mic voice sound Vumeter (left mic volume peak bar indication) is below 80-90%, in the green area, see annexed pictures )
1. * **ALC Automatic mic volume Level Control** (available in Portapack boards that uses AK4951 audio codec platform) :
With those "ALC" GUI options, user can adjust from +12 dB's to -12 dB's mic gain.