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Noise estimation for use with noise reduction and echo cancellation in personal communication

A communication signal and beam technology, which is applied in the fields of audio processing and estimation of the spectral correlation matrix between microphones, can solve the problems of echo signal attenuation, etc., and achieve the effect of improving sound quality and improving recognition rate.

Active Publication Date: 2014-03-12
OTICON
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AI Technical Summary

Problems solved by technology

However, certain components of the echo signal cannot be sufficiently attenuated by this method, especially in rooms with long reverberation times

Method used

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  • Noise estimation for use with noise reduction and echo cancellation in personal communication
  • Noise estimation for use with noise reduction and echo cancellation in personal communication
  • Noise estimation for use with noise reduction and echo cancellation in personal communication

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Embodiment Construction

[0097] The following description will be made with reference to the drawings which illustrate how the present invention can be implemented.

[0098] figure 1 A schematic diagram showing a user in a communication situation, which can represent, for example, a hands-free phone situation in a car, a remote conference, or a voice control situation, where the device is performing residual echo and noise reduction. The user 105 is in an environmental noise source 102, in which one or more speakers 103 reproduce, for example, a sound signal from a remote speaker 104. The speakers can also be reproducing signals from other sound sources such as radio, music sources, sound tracks, karaoke systems, etc. The user can generate the target voice signal, and the goal of the device is high-quality detection. The array of M transducers 101 detects the acoustic mixed signal, which may be composed of the superposition of the target voice signal, the echo signal from the speaker, the environmental ...

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Abstract

The invention relates to a noise estimation for use with noise reduction and echo cancellation in personal communication. The method comprises processing M subband communication signals and N target-cancelled signals in each subband with a set of beamformer coefficients to obtain an inverse target-cancelled covariance matrix of order N in each band; using a target absence signal to obtain an initial estimate of the noise power in a beamformer output signal averaged over recent frames with target absence in each subband; multiplying the initial noise estimate with a noise correction factor to obtain a refined estimate of the power of the beamformer output noise signal component in each subband; processing the refined estimate with the magnitude of the beamformer output to obtain a postfilter gain value in each subband; processing the beamformer output signal with the postfilter gain value to obtain a postfilter output signal in each subband; and processing the postfilter output subband signals to obtain an enhanced beamformed output signal.

Description

Technical field [0001] This application relates to audio processing, in particular to speech enhancement, especially to improve the signal quality of target speech signals in noisy environments. The present invention relates to the estimation of the inter-microphone spectral correlation matrix of noise embedded in a multi-channel audio signal obtained from multiple microphones existing in an acoustic environment including one or more target sound sources and multiple undesirable noise sources . [0002] The present invention can be used, for example, to obtain an estimate of the spectral signal-to-noise ratio and to form a spectral weight that will be applied to the beamformer output signal to obtain an enhanced signal, in which the target speech content is retained and the noise component is greatly reduced. [0003] The spectral weight can be used, for example, to further reduce the residual echo signal that has escaped from the initial stage of the echo cancellation system. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0224G10L21/0232
CPCH04R3/02H04R2227/009H04M9/082H04R3/005H04R1/1083G10L15/20H04R2225/43G10L21/0232G10L2021/02166
Inventor U·克耶姆斯J·詹森
Owner OTICON
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