| 摘要 |
<P>PROBLEM TO BE SOLVED: To generate a high-quality and long-time reverberation sound without any wasteful use of a circuit. <P>SOLUTION: The reverberation effect adding circuit is provided with a first convolution circuit which includes FIR filters 80-1 to 80-4 and an adder (accumulator) 81, a moving average circuit 82 for receiving musical sound waveform data delayed by a prescribed number of stages in the first convolution circuit and outputting averaged second musical sound waveform data obtained by sampling at a second sampling frequency smaller than a first sampling frequency, a second convolution circuit which includes FIR filters 80-5 to 80-28 for receiving second musical waveform data obtained by sampling at the second sampling frequency and an adder (accumulator) 83, and an interpolator 84 for receiving an output value from the adder 83 of the second convolution circuit, calculating an interpolated value of the output value, and sequentially outputting the output value and the interpolated value. The output of the adder 81 and the output of the interpolator 84 are added to be output as reverberation sound data. <P>COPYRIGHT: (C)2009,JPO&INPIT |
