Invention Grant
- Patent Title: Controlling speech enhancement algorithms using near-field spatial statistics
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Application No.: US13199593Application Date: 2011-09-02
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Publication No.: US10015589B1Publication Date: 2018-07-03
- Inventor: Samuel Ponvarma Ebenezer
- Applicant: Samuel Ponvarma Ebenezer
- Applicant Address: US TX Austin
- Assignee: Cirrus Logic, Inc.
- Current Assignee: Cirrus Logic, Inc.
- Current Assignee Address: US TX Austin
- Agency: Cahill Glazer PLC
- Main IPC: H04R3/00
- IPC: H04R3/00 ; H04R1/40

Abstract:
A telephone includes at least two microphones and a circuit for processing audio signals coupled to the microphones. The circuit processes the signals, in part, by providing at least one statistic representing maximum normalized cross-correlation of the signals from the microphones, doaEst, dirGain, or diffGain and comparing the at least one statistic with a threshold for that statistic. At least one of noise reduction and speech enhancement is controlled by an indication of near-field sounds in accordance with the comparison. Indication of near-field speech can be further enhanced by combining statistics, including a statistic representing inter-microphone level difference, each of which have their own threshold. dirGain and diffGain are derived from signals incident upon the microphones such that the desired near-field signal is not suppressed.
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