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Using ADAU1761 for microphone beamforming

We used an ADAU1761 to create a simple microphone beamforming application, with two omnidirectional ADMP504 MEMS microphones mounted in an endfire configuration.

Using the attached Excel sheet to perform the calculations, we calculated that a total of 6 samples of delay are required to generate a delay appropriate for a microphone spacing of 42 mm at a sample rate of 48 kHz.

Distance between microphones (mm) 42
Speed of sound (mm per sample @ 48 kHz) 7
Samples to cover microphone distance @ 48 kHz 6

The following project was created to realize the signal flow.

Reference materials:

Microphone Beamforming Application Note

ADMP504 MEMS Microphone Datasheet

ADAU1761 Datasheet

Attachments:
1667.ADAU1761_Audio_CardiodBeamforming_42mm_48kHz.dspproj.zip
  • admp504
  • microphone
  • adau1761
  • beamforming
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