MUSICAL INTERVAL CONVERTING DEVICE

摘要

PURPOSE: To provide a musical internal converting device, which can convert the musical interval of a sound signal into an arbitrary interval with high precision, without having to vary the reproduction time and which can morevover reduce high-frequency distortion without requiring a scale increase nor a speed increase. CONSTITUTION: A filter coefficient storage part 6 stores four filter coefficient arrays, corresponding to four subfilters obtained by the polyphase decomposition of a low-pass filter for four-times oversampling. Filter coefficient array selection parts 5a and 5b select one of the four filter coefficient arrays stored in the filter coefficient array storage part 6, according to the 1st and 2nd bits of the decimal part of a readout address generated by readout address generation parts 4a and 4b. Filter arithmetic parts 2a and 2b receives a couple of voice data arrays and perform filter operation, by using the filter coefficient array selected by the selection parts 5a and 5b.