Reverberation effect adding device

A reverberation effect adding device comprising:

• an impulse response coefficient memory which has stored a plurality of impulse response coefficients;
• a plurality of (1st-sth) convolution means where s=2, 3, 4, . . . S each for receiving n musical sound waveform data sequentially in time series order, for sequentially delaying the received first (n−1) ones of the n musical sound waveform data by (n−1), (n−2), . . . , and 1 stages, respectively, in a received order at a sampling period set in that convolution means, the sampling period set in any sth convolution means being shorter than that of (s+1)th convolution means of following order, for reading n impulse response coefficients corresponding to the delayed first (n−1) musical sound waveform data and the last received musical sound waveform data from the impulse response coefficient memory, for multiplying the delayed first (n−1) musical sound waveform data and the last received musical sound waveform data by the read n corresponding impulse response coefficients, respectively, and for adding respective results of the multiplications, thereby outputting a result of the addition;
• a plurality of conversion means each provided for a respective one of the plurality of convolution means excluding the 1st convolution means for converting an output period of the musical sound waveform data outputted from that convolution means to the sampling period set in the convolution means of following order, and for supplying the musical sound waveform data at the converted sampling period to the convolution means of following order;
• a plurality of inverse conversion means each provided for a respective one of the plurality of convolution means excluding the 1st convolution means for inversely converting an output period of the result of the addition outputted sequentially from that convolution means to the sampling period of the convolution means of preceding order;
• and
• a plurality of addition means each provided for a respective one of the plurality of convolution means excluding the Sth convolution means for adding the result of the addition outputted from that convolution means, whose sampling period is changed to the sampling period set in the conversion means of preceding order, by the inverse conversion means provided for that convolution means and the result of the addition outputted from the convolution means of preceding order, and for outputting a result of the addition to the conversion means provided for the convolution means of preceding order.