Patent ID: 8275609

Claim:
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.