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Microphone Array Projects

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  1. Microphone Array Projects Ryan M. Corey and Andrew C. Singer

  2. Capture spatial information about sound scene • Localize and separate multiple sound sources • Enhance signals in noisy environments • Microphone Arrays Far-field speech recognition Voice communication Spatial Sound Processing Augmented reality Assistive listening

  3. Microphone array designs for real-world data collection • Record raw multichannel audio data for later analysis • Test new audio source separation algorithms • Polished, reliable design we can easily reproduce • Competent engineer could assemble in a day or two • Firmware, drivers, and documentation • Calibration and test data • Pick your own application! • Assistive listening • Machine audition • Audio augmented reality • 3D audio/video production • Entertainment, gaming, music, karaoke… • What we want

  4. Most wearable electronics have only 2-4 mics • Large arrays give better spatial resolution • Many microphones (~ 8-32) • Large total length/area (10’s of cm) • Many possible wearable designs • Head, neck, shoulders, torso, glasses… • Should be portable, comfortable, safe • Record raw data for later analysis • (Optional) Real-time spatial audio processing • Add a programmable processor • < 10 ms total mic-to-ear latency for real-time listening • Project 1: Wearable Microphone Array B. Widrow (Stanford), 2000 U. Washington “COSINE”, 2009

  5. New tech makes it easier to build huge microphone arrays • (Digital) MEMS microphones • Improved embedded processing • Need good multichannel data for signal processing research • Design modules that can be scaled to dozens/hundreds of mics • Need large bandwidth for raw data • Need synchronized sampling between modules • OK to demonstrate small setup that we can later scale up • Portable and reconfigurable • Record in different environments • Rearrange modules for different array shapes • Project 2: Huge Microphone Array MIT “LOUD”, 2004

  6. Augmented listening headphones • Robot/drone microphone array • Binaural recording (virtual 3D audio) • Audio augmented reality • Anything with microphones on it! • Other Ideas Put a mic on it Contact Ryan M. Corey 119 Coordinated Science Lab corey1@Illinois.edu

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