Tone signal generation device for an electronic musical instrument
US4633749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Jan 9, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H7/008
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A musical tone signal generator for an electronic musical instrument is constructed by a waveshape generator, a function generator and an interpolator. The waveshape generator successively generates adjacent two waveshapes of a plurality of different waveshapes which have been intermittently sampled in an actual produced tone. The function generator generates an interpolation function which is a function of time. The interpolator weights the adjacent two waveshapes in accordance with the interpolation function, combines the weighted two waveshapes and outputs the combined waveshape as a musical tone waveshape to be produced at a rate corresponding to a frequency of the musical tone waveshape. In the waveshape generator, the generation of next two adjacent waveshapes are performed when a value of the interpolation function has become equal to a predetermined value. As a result, it is made possible to obtain a good quality timewise spectrum change of the musical tone waveshape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.