Ad-hoc Microphone Array

- Acoustic Signal Processing Using Multiple Mobile Recording Devices -

Abstract

Microphone array signal processing is a framework for source localization, source enhancement and source separation with processing multichannel observations achieved using multiple microphones, which are difficult using a single microphone. In microphone array signal processing, the small time difference between channels is a very important cue to obtain spatial information. Therefore, a multichannel A-D converter has been conventionally essential for synchronized observation. On the other hand, if microphone array signal processing can be performed using asynchronous recording devices such as laptop PCs, voice recorders, or smart phones, which are easily available in daily life, it would enhance convenience and increase the number of possible applications markedly. In this review, focusing on a new trend of microphone array signal processing using asynchronously recording devices, we survey existing works and also introduce our approach.