DEVICE, METHOD AND PROGRAM FOR COUPLING SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a device and a method for coupling signal which enable gener ation a natural synthetic sound while reducing noises. SOLUTION: A plurality of waveform signals are supplied alternately to a delay part 1A and a Fourier transform part 2A and to a delay part 1B and a Fourier transforming part 2B. These waveform signals are delayed and sent to an adding part 3 by the delay parts 1A and 1B, and these waveform signals are added and sent to an LPF (low-pass filter) 5 by the adding part 3. Meanwhile, Fourier transform is applied to the waveform signals by the Fourier transform parts 2A and 2B and spectrum data expressing an obtained spectrum are sent to a filter characteristic determining part 4. The upper limit frequency of the spectrum expressed by these spectrum data is determined as a cutoff frequency of the LPF 5 by the filter characteristic determining part, and filtering is performed by sending a control signal to the LPF 5 at a time point when the coupling part of the waveform signals is supplied to the LPF 5. While there is no control signal, no filtering is performed and signals are passed by the LPF 5.