Storing and interpolating means for a musical sound generating device

摘要

A musical sound generating device has a waveform memory to store musical sound waveform data to be read-out repeatedly between a loop-top address (integral address) and a loop-end address (integral address). The same musical sound waveform data is stored at the loop-top address and the loop-end address. An address computing circuit computes a read-out address, including a decimal part, to repeatedly read out the musical sound waveform data stored between the loop-top address and the loop-end address in the waveform memory. An interpolating circuit carries out interpolation if the read-out address generated by the address computing circuit includes a decimal part. Interpolation is carried out by dividing in proportion the musical sound waveform data read out from the waveform memory using an integral part of the read-out address and the musical sound waveform data read out from the waveform memory using a value obtained by adding 1 to the integral part of the read-out address according to the decimal part.