TheArchive/mayhem-firmware
1
0
Fork 0
mirror of https://github.com/portapack-mayhem/mayhem-firmware.git synced 2025-02-21 22:08:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

Updated Microphone Transceiver (markdown)

Brumi-2021 2022-10-18 23:31:17 +02:00
parent 019216f107
commit 7f7cd9f72f
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Microphone-Transceiver.md

@ -34,10 +34,15 @@ 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), we introduced ALC and Boost options control.
![image](https://user-images.githubusercontent.com/86470699/196547451-91bc4b30-ae66-4506-b8a8-490d280f79da.png)
To minimize that mic ADC saturation (and consequently, audio distortion , and spectrum harmonics radiation), we introduced ALC and Boost options control.
* ![image](https://user-images.githubusercontent.com/86470699/196547451-91bc4b30-ae66-4506-b8a8-490d280f79da.png)
![image](https://user-images.githubusercontent.com/86470699/196548467-50852c3b-e4e5-47c4-b047-6efb7b0d6dea.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 )
(example LSB with low modulation index)
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.