| 摘要 |
PURPOSE:To make it possible to simply and continuously select many waveforms as low frequency oscillator(LFO) waveforms by connecting a low pass filter(LPF) means to the post stage of an oscillation means for outputting a low frequency waveform signal including many higher harmonic components. CONSTITUTION:A triangular wave generator 21 for generating a triangular wave as an LFO generates a low frequency triangular wave based upon a triangular wave generator parameter GF and inputs the generated triangular wave to the LPF 22 connected to its post stage. The LPF 22 for cutting off the higher harmonic component of the waveform (triangular wave) generated by the generator 21 is connected to the post stage of the generator 21 and cuts off the higher harmonic component of the triangular wave by the prescribed gain at a prescribed cut-off frequency based upon an LPF coefficient G corresponding to the cut-off frequency. Consequently, an output waveform from the triangular wavegenerator 21 can be selected as optional continued waveforms from a triangular wave to a sine wave. |
