| 摘要 |
PURPOSE:To accurately and easily decide the voice part and breathing sound part of a detection signal obtained from a microphone, to greatly reduce the cost and reduce the size of the device, and to improve voice quality and further increase adaption to use environment and flexibility. CONSTITUTION:The detection signal Sa obtained from the microphone 2 is converted into a digital detection signal x(n), which is delayed by a certain time (by N samples) and, the delayed digital detection signal x(n-N) is supplied to an adaptive filter 3 to estimate an undelayed digital detection signal x(n), and, a part where an estimation error EM is larger than a certain Es is decided as the voice part Mv and a part where the error is less than the certain value Es is decided as the breathing sound part Mb. |
