Ultrasonic Doppler sensor for speech-based user interface

Details Ultrasonic Doppler sensor for speech-based user interface Ultrasonic Doppler sensor for speech-based user interface

2008-05-13

2008-05-13

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

Reexamination Certificate

active

07372770

ABSTRACT:
A method and system detect speech activity. An ultrasonic signal is directed at a face of a speaker over time. A Doppler signal of the ultrasonic signal is acquired after reflection by the face. Energy in the Doppler signal is measured over time. The energy over time is compared to a predetermined threshold to detect speech activity of the speaker in a concurrently acquired audio signal.

REFERENCES:
patent: 4080661 (1978-03-01), Niwa
patent: 2007/0165881 (2007-07-01), Ramakrishnan et al.

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