Microphone check, one, two, one, two…


Yesterday, we’ve worked on the microphone with Alexis. As using the I2S protocol is more practical for us but it isn’t implemented on the 2.5.6 version of ChibiOS, we decided to add its implementation, available on Chibios 3. Once the good configurations set, we finally succeded in making the clock and the data transfer work.

After this, we added a processing to make the raw data useful. For this, we used a library that implements decimation signal processing and a low pass filter. In this way, the microphone capture the sound 😀

Now, we just have to apply a band pass filter to delete some unuseful data. The next step will be the sound recognition 🙂

PS : Thanks again to Alexis, for his HUGE help.

Bye !

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