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Method and device for suppressing unwanted audio signals

An audio signal and noise suppression technology, applied in the field of audio signal processing, can solve problems such as adaptive filter nonlinearity

Active Publication Date: 2018-10-12
WAVES AUDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In some examples, for example, due to changes in the acoustic environment, the linear system may not be stationary, resulting in a non-linear behavior of the adaptive filter

Method used

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  • Method and device for suppressing unwanted audio signals
  • Method and device for suppressing unwanted audio signals
  • Method and device for suppressing unwanted audio signals

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Embodiment Construction

[0080] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the system methods and apparatus. However, it will be understood by those skilled in the art that the present systems, methods and devices may be practiced without some or all of these specific details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the present methods and apparatus.

[0081] The terms "plurality" and "plurality" as used herein may include, for example, "a plurality" or "two or more", although the examples disclosed and discussed herein are not limiting in this regard. The terms "plurality" or "plurality" may be used throughout the specification to describe two or more components, devices, elements, units, parameters and the like. Unless explicitly stated, method examples described herein are not limited to any particular order or sequence. Additionally...

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Abstract

Apparatus for removing unwanted components from an audio signal, the apparatus comprising a processor coupled to a memory, the processor configured to receive a reference input and a processed input into the memory, wherein the processed input is the result of a reduction process of unwanted components of the audio signal; the envelope values ​​of the processed input and the reference input are estimated at a plurality of time and frequency instances; for each of the time and frequency instances : calculating a first gain related to the ratio of the estimated envelope value of the processed input to the estimated envelope value of the reference input; applying non-linear processing to the first gain to generate a second gain; calculating an output gain as a ratio between the second gain and the first gain; and applying the output gain to the input of the process; and thereby producing a filtered output with suppressed unwanted components.

Description

technical field [0001] The present invention generally relates to audio signal processing. In particular, the present invention relates to audio signal processing for suppressing noise, acoustic echoes or any other unwanted signals. Background technique [0002] It is common in the field of audio signal processing to use adaptive filters to suppress unwanted extraneous signals, such as noise or echo, from an audio signal containing desired information, such as speech, music, and / or other desired information. Such an adaptive filter uses at least one audio input signal. [0003] Some methods for suppressing unwanted signals may include noise reduction, microphone beamforming and echo cancellation techniques. In some examples, adaptive linear filters may be used to model unknown linear systems that may include acoustic or electronic signals. In some examples, an adaptive filter may be able to estimate the system it models. However, in some examples, adaptive filters suffer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0208H04M9/08
CPCH04M9/08G10L2021/02082G10L21/0232G10L21/0264G10L21/0208G10L21/0224H04M9/082
Inventor I.尼奥兰S.内德贾R.亚姆
Owner WAVES AUDIO