How to set the gain of the pdm module in nrf52832

RE: How to set the gain of the pdm module in nrf52832

Jørn — Tue, 28 Nov 2017 15:12:58 GMT

It would be interesting to know where the noise comes from. Are you able to store it somewhere else? Or output it to the pc and play it back there? That would eliminate any problems with the wireless transfer. Another possibility would be that the microphone generates the noise or is affected by noise on the board. Or that the noise bleeds in from somewhere as the chip is sampling the data. Are you running any power hungry hardware while receiving data?

RE: How to set the gain of the pdm module in nrf52832

????? — Sat, 25 Nov 2017 02:03:45 GMT

According to the datasheet,I just connect the microphone with the PDM interface directly.I have transmited the PCM data to USB dongle,so PC can record the audio data with USB.However when I repalyed the audio,it sounded like a lot of noise. Yesterday I found that it lost data when I transmited the data with 2.4G.But I am not sure about that the lost data caused the noise.

RE: How to set the gain of the pdm module in nrf52832

Jørn — Thu, 23 Nov 2017 14:33:03 GMT

The PDM module of the nRF52832 converts the PDM signal to PCM. The gain set in the register should then alter the numerical value for each sample. How do you play the sound? Do you have a figure showing how you have connected your microphone and speaker to the nRF?