MEMs microphone in an array
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Based on STMicro software that mixes the input from both microphones to provide real time beam forming - osxAcousticBF. The software requires use of a STM32F4 through STMicro's STM32Cube tool chain.
Any software related will be released under BSD or MIT license. SAAS or cloud based software will be AGPL.
With PDM, SPI or even GPIO can be utilized to receive the audio input. This is much better than just i2s. In fact, PDM can be made to work as an i2s stream, yet is compatible with regular SPI or fast GPIO input.
The design allows for all sorts of directional listening and filtering.
A minimum of 4mm is required between the microphones for the ST software to work.
I went to a session put on by ST that discussed their work to define software based filtering of microphone arrays. So I was inspired by this.
Chris Hamilton
Marc René Schädler
harayz