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Correlation-based method for ambience extraction from two-channel audio signals

A signal-related and environmental technology, applied in binaural systems, speech analysis, stereo systems, etc., can solve problems such as underestimation of environmental volumes

Active Publication Date: 2010-11-17
CREATIVE TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Short-term estimation is necessary for the operation of masking-based methods, but existing methods for short-term estimation lead to underestimation of environmental quantities

Method used

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  • Correlation-based method for ambience extraction from two-channel audio signals
  • Correlation-based method for ambience extraction from two-channel audio signals
  • Correlation-based method for ambience extraction from two-channel audio signals

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Embodiment Construction

[0019] Reference will now be made in detail to the preferred embodiments of the present invention. Examples of preferred embodiments are illustrated in the accompanying drawings. While the invention will be described in conjunction with these preferred embodiments, it will be understood that it is not intended to limit the invention to such preferred embodiments. On the contrary, the intention is to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be practiced without some or all of these specific details. In other instances, well-known mechanisms have not been described in detail so as not to unnecessarily obscure the present invention.

[0020] It should be noted here that like numerals refer to like parts...

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Abstract

A method of ambience extraction includes analyzing an input signal to determine the time-dependent and frequency-dependent amount of ambience in the input signal, wherein the amount of ambience is determined based on a signal model and correlation quantities computed from the input signals and wherein the ambience is extracted using a multiplicative time-frequency mask. Another method of ambience extraction includes compensating a bias in the estimation of a short-term cross-correlation coefficient. In addition, systems having various modules for implementing the above methods are disclosed.

Description

[0001] Related applications [0002] This application claims the benefit of US Provisional Application No. 60 / 977,600, filed October 4, 2007, the entire specification of which is incorporated herein by reference in its entirety. [0003] This application claims the benefit of US Non-Provisional Application No. 12 / 196,239, filed August 21, 2008, the entire specification of which is incorporated herein by reference in its entirety. technical field [0004] The present invention relates to audio processing technology. More particularly, the present invention relates to systems and methods for extracting context from audio signals. Background technique [0005] Various techniques can be used to extract ambience components from a two-channel stereo signal. Stereo signals can be decomposed into primary components and ambient components. A common application of these methods is listening enhancement systems, where ambient signal components are modified and / or spatially redistrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00
CPCH04S3/002H04S7/30G10L19/008H04S1/002
Inventor 朱哈·O·梅里玛迈克尔·M·古德温吉恩-马克·乔特
Owner CREATIVE TECH LTD
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