Microphone noise on sensor tile with all-mems-2 v2.1.0

[ALong.4]

Hi,

i'm developing an application that streams audio from sensor tile to pc (for testing purpose i'm using ST Ble Sensor app from Play Store).

I'm getting audio problem when using official all-mems applications.

In order to recap:

• All-mems-2 v2.1.0: noisy audio
• All-mems-1 v4.2.0: noisy audio
• All-mems-1 v2.1.0: perfect audio
• Is not an HW problem since on different sensor tile i have the same behaviour.

My suspect is that something in microphone setting/driver implementation is changed.(since the version BlueVoiceADPCM is the same (v2.0.0)).

Can you help me?

Someone is facing the same problem?

Thanks,

Alessandro

[ALong.4]

The original problem was raised here: https://community.st.com/s/question/0D53W00001tf0FiSAI/bluevoice-over-sensortile

(people asking/commenting are my colleagues)

[Eleon BORLINI]

Hi Alessandro @ALong.4​ ,

I tried to give some suggestions in the private message sections.

Reporting them here for the community, basically the BlueVoiceADPCM is always of the same version, since it hasn't be updated in the subsequent ALLMEMSx versions.

ALLMEMSx versions however differs in the used drivers, which in All-mems-1 v2.1.0 version are in the format BSP V1.x.x.

By the way, if you need only to do streaming audio via BLE, he can start from FP-AUD-BVLINK1. This is a simpler example, that uses the same BlueVoice library and is designed for audio streaming.

-Eleon