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US 8,275,609 B2Granted
Voice activity detection
AssigneeHuawei Technologies Co., Ltd.
InventorZhe Wang
Life of this patent
Estimating the term…
Abstract
A voice activity detection (VAD) device and method provide for a VAD threshold that is adaptive to background noise variation.
Claims17
A voice activity detection (VAD) device, comprising:
- a background analyzing unit adapted to analyze background noise features of a current signal according to an input VAD judgment result, obtain parameters related to a background noise variation, and output the obtained parameters;
- a VAD threshold adjusting unit adapted to obtain a bias of the VAD threshold according to the parameters output by the background analyzing unit, and output the bias of the VAD threshold;
- and
- a VAD judging unit adapted to modify a VAD threshold to be modified according to the bias of the VAD threshold output by the VAD threshold adjusting unit, perform a background noise judgment according to the modified VAD threshold, and output a VAD judgment result;
- wherein the device further comprising an external interface unit adapted to receive external information of the device;
- wherein the VAD threshold adjusting unit obtains a first bias of the VAD threshold according to the parameters output by the background analyzing unit, and outputs the first bias of the VAD threshold as a final bias of the VAD threshold to the VAD judging unit;
- or
- the VAD threshold adjusting unit obtains a first bias of the VAD threshold according to the parameters output by the background analyzing unit and a second bias of the VAD threshold according to the parameters output by the background analyzing unit and the external information of the device, obtains a final bias of the VAD threshold by combining the first bias of the VAD threshold and the second bias of the VAD threshold, and outputs the final bias of the VAD threshold to the VAD judging unit;
- or
- the VAD threshold adjusting unit obtains a second bias of the VAD threshold according to the parameters output by the background analyzing unit and the external information of the device, and outputs the second bias of the VAD threshold as a final bias of the VAD threshold to the VAD judging unit.
7 more elements
A voice activity detection (VAD) method, comprising:
- analyzing background noise features of a current signal according to a VAD judgment result of a background noise, and obtaining parameters related to a background noise variation;
- obtaining a bias of the VAD threshold according to the parameters related to the background noise variation;
- and
- modifying a VAD threshold to be modified according to the bias of the VAD threshold, and performing VAD judgment on the background noise by using the modified VAD threshold;
- wherein the method for obtaining a bias of the VAD threshold according to the parameters related to the background noise variation comprises at least one of following blocks:
- when the setting does not need to consider specified information obtaining a first bias of the VAD threshold according to the parameters related to the background noise variation and using the first bias of the VAD threshold as a final bias of the VAD threshold;
- when the setting needs to consider specified information and the background sound is an unsteady noise and/or a signal noise ratio (SNR) is low obtaining a first bias of the VAD threshold according to the parameters related to the background noise variation and a second bias of the VAD threshold according to the parameters related to the background noise variation and the specified information, and obtaining a final bias of the VAD threshold by combining the first bias of the VAD threshold and the second bias of the VAD threshold;
- when the setting needs to consider specified information and the background sound is a steady noise and/or the SNR is high obtaining a first bias of the VAD threshold according to the parameters related to the background noise variation and using the first bias of the VAD threshold as a final bias of the VAD threshold;
- and
- when the setting considers specified information only, obtaining a second bias of the VAD threshold according to the parameters related to the background noise variation and the specified information and using the second bias of the VAD threshold as a final bias of the VAD threshold.
7 more elements
Dependencies are inferred from the claim text.