Tone signal generating apparatus having a low-pass filter for interpolating waveforms

摘要

A tone signal generating apparatus comprises a waveform memory in which a plurality of waveform data representing different waveforms but corresponding to a same tone name are stored. These different waveform data are sequentially read from the memory and are supplied to a digital low-pass filter which comprises a delay circuit and a multiplier connected to each other to form a feedback loop. The low-pass filter smoothes abrupt variation of the waveform data and outputs a smoothed waveform data thereby interpolating the different waveforms. A tone signal is produced in accordance with this smoothed waveform data.