Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-47166
Delbruck, T; Koch, T; Berner, R; Hermansky, H (2010). Fully integrated 500uW speech detection wake-up circuit. In: Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium, Paris, France, 30 May 2010 - 02 June 2010, 2015-2018.
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Speech analysis requires substantial computation. It is desirable to run this analysis only when needed and at other times to go to a low power state. Here we propose a self-biased low power speech detection wake up circuit which interfaces directly to standard electret microphones. The speech detector includes a microphone preamplifier, a power extraction squaring circuit, a bandpass filter passing power of the modulation spectrum in the speech band from 2-12 Hz, a half rectifier which extracts this phoneme band power, and a PFM silicon neuron which emits spikes indicating phoneme-rate modulation of the audio spectrum. The output of the speech detector circuit is an asynchronous stream of digital spikes at a rate of 1Hz to 20Hz whose temporal structure indicates the presence of speech. A subsequent conventional processor will go to sleep between spikes and only wake up for full power speech analysis when the temporal structure indicates speech. The circuit is built in 1.6um 2P-2M CMOS and consumes 500uW with a 3V supply when attached to a standard electret microphone.
|Item Type:||Conference or Workshop Item (Paper), refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Neuroinformatics|
|DDC:||570 Life sciences; biology|
|Event End Date:||02 June 2010|
|Deposited On:||02 Mar 2011 14:39|
|Last Modified:||17 Oct 2012 04:56|
|Number of Pages:||3|
|Free access at:||Publisher DOI. An embargo period may apply.|
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