Tone signal generation device
US4706537A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Mar 5, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H7/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Waveshapes of plural periods for plural channels having characteristics different from each other are stored in a waveshape memory and read out from it when a musical tone is to be produced. Read out waveshapes are respectively weighted by weighting data supplied from a weighting data generator and thereafter a desired tone waveshape is obtained by electrically or acoustically combining these weighted waveshape. As an example, the waveshapes are composed of plural attack waveshapes equal in number to channels and only one sustain waveshape. In this case, the attack portion of the musical tone is formed by the combined one of the attack waveshapes and the sustain portion is formed by the sustain waveshape. This enables the memory capacity of the waveshape memory to be reduced and facilitates the complex tone color control in the attack portion. In another case, each of the waveshapes is composed of an attack portion and a sustain portion, sustain waveshapes forming the sustain portions being matched in phase. In both of the above cases, weighting data may be different depending upon a tone color to be imparted on the musical tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.