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
