| 摘要 |
PROBLEM TO BE SOLVED: To reduce discontinuous residual noise which is conventionally a defect in a spectrum subtraction processing. SOLUTION: This system for suppressing noise is constituted of a frame separation section 1 which segments input signals by every fixed interval, a short-time spectrum calculation section 2 of frame signal, a detection section of voice interval, a noise spectrum estimation section 4, an average spectrum calculation section 5 which adaptively calculates a time average value of input signal spectrum, a subtraction filter calculation section 6 which calculates a subtraction filter by comparing the estimated noise with an average spectrum and a filter multiplication section which multiplies the filter by the input signal spectrum. COPYRIGHT: (C)2004,JPO
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