Barque zone waina filtering and the noise control which is based on the doburinga noise appraisal which was corrected

摘要

In the noise restrictive measure, the input signal is converted by the frequency domain by dispersion Fourier analysis, is divided into barque zone. Noise is appraised the respective zone (85) in. The circuit which appraises noise direction between noise includes the smoothing filter which renews noise appraisal at the time constant which is slower than between sound. This noise restrictive measure includes the noise control factor which is inversely proportional with the signal-noise ratio of the respective frame of the input signal (89) the circuit which is adjusted (86) furthermore. Noise appraisal subtraction is done from the signal in the respective zone. The signal re-is converted by the time domain by discrete Fourier transform, overlaps and the window which is synthesized, during processing removes the distortion which it can occur.