Forward decimated PCM-output from a digital microphone

RE: Forward decimated PCM-output from a digital microphone

sara — Tue, 16 Jul 2019 08:54:25 GMT

thanks. I will download Thingy:52 and check with pdm working.

RE: Forward decimated PCM-output from a digital microphone

Bjørn Kvaale — Tue, 16 Jul 2019 07:43:22 GMT

He may have been referring to this documentation. Thingy:52 source code can be found here.

RE: Forward decimated PCM-output from a digital microphone

sara — Tue, 16 Jul 2019 06:27:30 GMT

No I have not downloaded the Thingy:52 source code. Can you send me the link for it? No, not the documentation link I meant the link which MortenBech had provided.

RE: Forward decimated PCM-output from a digital microphone

Bjørn Kvaale — Tue, 16 Jul 2019 06:22:47 GMT

Do you mean the documentation link? There does not seem to be any issues with that link. Did you try to download the Thingy:52 source code?

RE: Forward decimated PCM-output from a digital microphone

sara — Mon, 15 Jul 2019 12:34:15 GMT

Hi, I am not able to open the link you have provided for the example. As I also want to use PDM . I had used this example but getting its not working for me https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/pdm-example-on-the-nrf52832

Can you help me with it?

RE: Forward decimated PCM-output from a digital microphone

Bjørn Kvaale — Tue, 13 Nov 2018 14:22:02 GMT

Hi Morten,

Have you taken a look at the Thingy SDK code? The Thingy:52 microphone uses ADPCM, which is then converted to PCM in the Android/iOS Thingy app. When streaming voice data from the smartphone to the Thingy:52, 8-bit PCM data is sent over BLE to the Thingy:52, which outputs the 8-bit PCM data.

I would recommend taking a look at the drv_speaker.h file. See this documentation too.

Kind Regards,

Bjørn