| 摘要 |
PURPOSE:To attain the fine control of the noise formant characteristic by giving the independent control to a skirt part and the band width of the noise formant characteristic on a simple constitution. CONSTITUTION:The white noise signal produced by a white noise generator 2 is transmitted through an LPF circuit part 3 and a relative noise generating part 16. Thus the frequency characteristic of the white noise signal is controlled according to the frequency characteristic of both parts 3 and 16 which are set independently of each other. A periodic waveform generating part 31 produces a periodic waveform having a frequency corresponding to the center frequency of a desired noise formant. A modulating multiplier 36 modulates a relevant periodic waveform signal with the noise signal undergone the control of its frequency characteristic. Then, the components of the noise signal emerge symmetrically at both sides bands of the formant center frequency. Thus the noise formant is obtained. The characteristic of a skirt part of the noise formant is controller with control of the frequency characteristic of the part 3. Meanwhile the band width characteristic of the noise formant is controlled with the characteristic of the part 16. |
