Waveform generating apparatus and method thereof

Abstract

To generate waveform having a complex waveform shape in a simple and abundantly controlled manner. Phase information, which changes with the rate corresponding to frequency information in accordance with the parameter that specifies at least two sample points, is generated so that the information is repeated along a normal direction and a reversed direction between at least the two specified sample points. The frequency information that is used for the rate with which the phase information is changed, is changed in accordance with the parameter that specifies the frequency information that sets the frequency of the waveform to be generated by at least the two sample points. By inputting the generated phase information into a waveform generating means which generates the sample data of a prescribed fundamental waveform made of a plurality of sample points, the waveform, in which the fundamental waveform is deformed in accordance with the change in the phase information, is generated. Thus, only specifying at least two sample points by a user, a waveform having a complex waveform shape is generated in a simple and abundantly controlled manner without changing pitch.

Description

technical field [0001] The present invention relates to a waveform generating device and method suitable for generating musical tone signals. In particular, it relates to a waveform generation device and method capable of deforming a basic waveform and generating a waveform having a complex waveform shape easily and with rich controllability. Background technique [0002] In the past, as a device for generating a tone signal, for example, a so-called FM type tone synthesis device (also referred to as an FM sound source) that synthesizes a tone signal having a desired harmonic composition through frequency modulation calculation (FM calculation) in the audible frequency domain is known. ). As previously known, an FM-based tone synthesizer basically generates a carrier signal and a modulating wave signal separately, modulates the carrier signal with the modulating wave signal, and generates a tone signal having a desired spectral composition. In general, such an FM-based ton...

AI Technical Summary

Problems solved by technology

[0005] However, as the readout control of the basic waveform, it is difficult to read out the sine wave from the sine wave table only by performing control such as shifting only the phase value or ignoring the lower bits in the predetermined phase interval as described above. The waveform shape of the sine wave varies greatly

Therefore, it is very difficult to generate a more complex tone signal that realizes various timbres using the waveform generated in this way, which is the problem.

Images