In order to enhance the quality of a communication signal derived from speech and noise (20), the likelihood that the communication signals result from at least some speech is determined. A calculator calculates a first power signal representing the power of at least a portion of the communication signals estimated over a first time period and calculates a second power signal representing the power of at least a portion of the communication signals estimated over a second time period longer than the first time period. The calculator also generates a comparison signal having a value related to the likelihood that the portion of the communication signals result at least from some speech by comparing a first expression involving the first power signal with a second expression involving the second power signal. The calculator also generates a speech likelihood signal having a value representing a first likelihood that the communication signal results from at least some speech in the event that the comparison signal falls within a first range and having a second value representing a second likelihood that the communication signal results from at least some speech in the event that the comparison signal value falls within a second range. The second likelihood is different from the first likelihood.
申请公布号
WO0173751(A8)
申请公布日期
2002.02.07
申请号
WO2001US40226
申请日期
2001.03.02
申请人
TELLABS OPERATIONS, INC.;CHANDRAN, RAVI;DUNNE, BRUCE, E.;MARCHOK, DANIEL, J.
发明人
CHANDRAN, RAVI;DUNNE, BRUCE, E.;MARCHOK, DANIEL, J.