Method for suppressing noise in an acoustic signal for a multi-microphone audio device operating in a noisy environment

A technology of audio equipment, noise, applied in the field of speech signal processing

Active Publication Date: 2014-01-15
PARROT AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The problem of the present invention is to access, in this context, efficient noise reduction techniques to deliver to a remote speaker a speech signal representing the language spoken by a nearby speaker (t

Method used

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  • Method for suppressing noise in an acoustic signal for a multi-microphone audio device operating in a noisy environment
  • Method for suppressing noise in an acoustic signal for a multi-microphone audio device operating in a noisy environment
  • Method for suppressing noise in an acoustic signal for a multi-microphone audio device operating in a noisy environment

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Embodiment Construction

[0055] An example of a noise reduction technique implementing the teaching of the present invention will now be described in detail.

[0056] Microphone sensor array configuration

[0057] Such as figure 1 As shown in, the microphone sensor M will be considered 1 ……M 4 In the array R, each sensor can be compared to a single microphone that picks up a noisy version of the speech signal from the source (speaker) of the useful signal whose incident direction is △.

[0058] Thus, each microphone picks up part of the useful signal (speech signal) and part of the surrounding parasitic noise in all forms (directional or diffuse, static or evolving in an unpredictable way, etc.).

[0059] Array R is configured to pick up and process signals in the higher part of the spectrum (hereinafter referred to as "high frequency", HF) and the lower part of the same spectrum (hereinafter referred to as "low frequency", LF) Two subarrays R 1 And R 2 .

[0060] Subarray R dedicated to the HF part of the spe...

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Abstract

Provided is a method for suppressing noise in an acoustic signal for a multi-microphone audio device operating in a noisy environment. The method comprises steps of: a) partitioning (10, 16) the spectrum of the noisy signal into a HF part and a LF part; b) operating denoising processes in a differentiated manner for each of the two parts of the spectrum with, for the HF part, a denoising by prediction of the useful signal from one sensor to the other between sensors of a first sub-array (R1), by means of a first adaptive algorithm estimator (14), and, for the LF part, a denoising by prediction of the noise from one sensor to the other between sensors of a second sub-array (R2), by means of a second adaptive algorithm estimator (18); c) reconstructing the spectrum by combining together (22) the signals delivered after denoising of the two parts of the spectrum, respectively; and d) selectively reducing the noise (24) by an Optimized Modified Log-Spectral Amplitude gain, OM-LSA, process.

Description

Technical field [0001] The present invention relates to language processing in noisy environments. [0002] In particular, the present invention relates to the processing of speech signals picked up by "hands-free" type telephone equipment intended for use in noisy environments. Background technique [0003] Such devices include one or several sensitive microphones, which not only pick up the user’s voice, but also pick up environmental noise. Environmental noise constitutes an interfering element. In some cases, this interfering element can even make the speaker’s The words are difficult to understand. The same is true if it is desired to implement speech recognition technology, because it is very difficult to shape the speech embedded in high-level noise. [0004] This difficulty associated with environmental noise is particularly restrictive in the case of "hands-free" devices in motor vehicles, regardless of whether these devices are in removable boxes that integrate all signal...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R3/02
CPCG10L21/0208G10L2021/02166H04R3/002
Inventor C·福克斯G·维特M·查伯特J·帕拉多
Owner PARROT AUTOMOTIVE
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