The PDM 16 has been designed to deliver sample-accurate, inter-channel phase information
Audio Precision has developed the PDM 16 interface module for its APx555, APx52x Series and APx58x Series audio analysers to expand the channel count availability for MEMS microphone array testing to 16 PDM channels simultaneously.
The PDM 16 comprises the input module installed in the analyser, a remote interface pod and an extension cable. It is designed to deliver sample-accurate, inter-channel phase information and critical data for the development of MEMS mic arrays. For those developing systems that use beam-forming microphone arrays and other DSP-based multichannel audio acquisition applications and requiring a true representation of input channel phase alignment to validate their algorithms, the PDM 16 employs synchronous sampling based on a common clock to ensure a clear depiction of the phase relationship between channels.
Audio Precision states that the PDM 16’s remote pod and extension cable are ‘acoustically silent’ to preserve the integrity of PDM signals up to 10m. The module also supports microphone measurements in anechoic chambers and can provide up to 50mA Vdd power supply to devices under test.