| 摘要 |
A noise suppresser is provided which does not generate steady noise generated by a drop in the receiving field strength, pulse-type unsteady noise generated in a multipass environment and the like as well as musical noise due to excessive subtraction and the like. The noise suppresser ( 100 ) includes a field strength analysis unit ( 3 ) which analyzes change in a field strength d of a digital signal x, and a frame generation unit ( 1 ) which generates a frame made up of signal values accumulated within a range which does not exceed a predetermined threshold value when the analyzed field strength has changed and exceeds the predetermined threshold value. Further, the noise suppresser ( 100 ) includes a noise estimation unit ( 4 ) which estimates a noise pattern |N|n' mixed in the input signal x when the field strength has changed and exceeds the predetermined threshold value, and a noise suppression unit ( 5 ) which suppresses the noise included in the generated frame using the estimated noise pattern.
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