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    • 5. 发明申请
    • VOICE ACTIVITY DETECTOR FOR HALF-DUPLEX AUDIO COMMUNICATION SYSTEM
    • 双向音频通信系统的语音活动检测器
    • WO1997008882A1
    • 1997-03-06
    • PCT/US1996012028
    • 1996-07-22
    • INTEL CORPORATIONGRAUMANN, David, L.
    • INTEL CORPORATION
    • H04M09/08
    • H04M9/08G10L25/78H04M9/10
    • A method (501, 502) of detecting voice in an audio signal comprises the steps of determining an average peak value (703, AP) representing an envelope of the audio signal, determining a running instance of audio signal standard deviation (702), which corresponds to one of a number of overlapping time intervals, and updating a power density function (PDF) by adding instances of noise to the PDF if the average peak of the audio signal exceeds the current level of the audio signal by a certain amount and if the current standard deviation value falls below a threshold for a predetermined time interval. A noise floor (NF) is located based on the mean value of the PDF (501), and, if the audio signal sustains a power level exceeding the noise floor, voice activity is determined to be present in the audio signal (502). The PDF is updated by a low confidence factor (1206) if all of the standard deviation values calculated during a certain period of time are below the threshold value and by a high confidence factor (1204) if all standard deviation values within a certain longer period of time period are below the threshold value.
    • 检测音频信号中的声音的方法(501,502)包括以下步骤:确定表示音频信号的包络的平均峰值(703,AP),确定音频信号标准偏差的运行实例(702),其中 对应于多个重叠时间间隔中的一个,并且如果音频信号的平均峰值超过音频信号的当前电平一定量,则通过向PDF添加噪声实例来更新功率密度函数(PDF),并且如果 当前标准偏差值在预定时间间隔内下降到阈值以下。 基于所述PDF(501)的平均值来设置噪声基底(NF),并且如果所述音频信号维持超过所述噪声本底的功率电平,则确定音频信号(502)中存在话音活动。 如果在一定时间段内计算的所有标准偏差值都低于阈值,并且通过高置信因子(1204),则在较长时间内的所有标准差值都将通过低置信因子(1206)更新PDF 的时间段低于阈值。