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System and method for monaural audio processing based preserving speech information

A voice and frequency domain technology, applied in the field of signal processing, which can solve the problems of limited delay, limited size, limited power, etc.

Inactive Publication Date: 2012-10-10
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional methods provide insufficient degradation or unsatisfactory generated signal quality
Even more so, the end application is a portable communication device and is power constrained, size constrained, and latency constrained

Method used

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  • System and method for monaural audio processing based preserving speech information
  • System and method for monaural audio processing based preserving speech information
  • System and method for monaural audio processing based preserving speech information

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Embodiment Construction

[0024] One or more presently preferred embodiments have been described, by way of illustration. It will be apparent to those skilled in the art that numerous changes and modifications can be made without departing from the scope of the present invention as defined in the claims.

[0025] One type of audio noise reduction is obtained by using a Wiener filter. This type of system will calculate the signal (S) and noise (N) powers of the audio input, and then apply a multiplier of S / (S+N) (if implemented in the frequency domain). When S becomes relatively large, the value of the frequency band becomes 1, while if the noise power in the band becomes large, the multiplier becomes 0. Accordingly, the associated signal-to-noise ratio is indicative of noise reduction. Typical extensions include: having slowly varying estimators of S or N, using various methods such as voice activity detectors to improve the quality of estimates for S or N, changing S or N from power estimators to e....

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Abstract

A method, system and machine readable medium for noise reduction is provided. The method includes: (1) receiving a noise corrupted signal; (2) transforming the noise corrupted signal to a time-frequency domain representation; (3) determining probabilistic bases for operation, the probabilistic bases being priors in a multitude of frequency bands calculated online; (4) adapting longer term internal states of the method; (5) calculating present distributions that fit data; (6) generating non-linear filters that minimize entropy of speech and maximize entropy of noise, thereby reducing the impact of noise while enhancing speech; (7) applying the filters to create a primary output in a frequency domain; and (8) transforming the primary output to the time domain and outputting a noise suppressed signal.

Description

technical field [0001] The present invention relates to signal processing and, more particularly, to noise reduction based on preserving speech information. Background technique [0002] Audio devices (eg, cell phones, hearing aids) and audio-enabled personal computing devices (eg, netbooks, tablet computers, personal digital assistants (PDAs)) are currently used in a variety of different environments. In some cases, users need to use such devices in environments whose acoustic characteristics include some unwanted signals, typically referred to as "noise". [0003] There are currently many methods for audio noise reduction. However, conventional methods provide insufficient degradation or unsatisfactory generated signal quality. Even more so, the end application is a portable communications device, and is power constrained, size constrained, and latency constrained. [0004] US2009 / 0012783 teaches power estimation of a Wiener filter varying speech and noise models, and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02
CPCG10L21/0232G10L25/18
Inventor J·P·邦迪
Owner SEMICON COMPONENTS IND LLC