Digital tone generation system with slot weighting of fixed width window functions
US4440058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1983 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jun 2, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2250/265
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An electronic musical instrument wherein purely digital techniques are utilized for generating the basic waveform train and also keying the waveform train so as to have the customary keying envelope with attack, sustain and decay portions. The wavetrain is a cyclically repeated series of four-term Blackman-Harris window functions, wherein there are preferably eight such functions in each series. A plurality of individual keying envelopes are generated by a piecewise linear technique, and these envelopes are assigned respectively to the waveforms in the series so that the relative amplitudes of the waveforms can change with time over the life of the tone. This results in modulating with time the harmonic content of the tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.