System and method for spatial noise suppression based on phase information
AssigneeAvaya Inc.
InventorsAvram Levi, Heinz Teutsch
Life of this patent
Estimating the term…
Abstract
Disclosed herein are systems, methods, and non-transitory computer-readable storage media for suppressing spatial noise based on phase information. The method transforms audio signals to frequency-domain data and identifies time-frequency points that have a parameter (e.g., signal-to-noise ratio) above a threshold. Based on these points, unwanted signals can be attenuated the desired audio source can be isolated. The method can work on a microphone array that includes two microphones or more.
Claims20
A method comprising:
- receiving a first audio signal via a first microphone, and a second audio signal via a second microphone;
- performing a short-time Fourier transform of the first audio signal and the second audio signal to yield frequency-domain data;
- identifying, in the frequency-domain data and based on a first phase of the first audio signal and a second phase of the second audio signal, time-frequency points having a parameter above a threshold;
- and
- generating an audio signal based on the time-frequency points.
A system comprising:
- a processor;
- a first microphone;
- a second microphone;
- and
- a computer-readable storage medium storing instructions which, when executed by the processor, cause the processor to perform operations comprising:
- receiving a first audio signal via the first microphone, and a second audio signal via the second microphone, wherein the first audio signal and the second audio signal originate from an audio space comprising a plurality of regions;
- performing a short-time Fourier transform of the first audio signal and the second audio signal for each of the plurality of regions to yield scanned frequency-domain data;
- identifying, in the scanned frequency-domain data and based on a first phase of the first audio signal and a second phase of the second audio signal, a time-frequency point having a highest signal-to-noise ratio;
- and
- marking a region in the audio space corresponding to the time-frequency point having the highest signal-to-noise ratio as a desired audio source.
A computer-readable storage device storing instructions which, when executed by a processor, cause the processor to perform operations comprising:
- forming a delay-and-sum beamformer using a first microphone and a second microphone;
- aiming the delay-and-sum beamformer at an audio source to receive a first audio signal via the first microphone, and a second audio signal via the second microphone, wherein the first audio signal and the second audio signal are from the audio source, to yield a short-time Fourier transform of the first audio signal and the second audio signal;
- generating frequency-domain data based on the short-time Fourier transform;
- identifying, in the frequency-domain data and based on a first phase of the first audio signal and a second phase of the second audio signal, time-frequency points having a signal-to-noise ratio above a threshold for the audio source;
- and
- isolating a desired audio signal of the audio source by retaining the time-frequency points and attenuating all other time-frequency points in the frequency-domain data.
Dependencies are inferred from the claim text.