Wavetable audio synthesizer with left offset, right offset and effects volume control
US7088835B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Aug 8, 2006 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H7/002
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A digital wavetable audio synthesizer is described. A synthesizer volume generator, which has several modes of controlling the volume, adds envelope, right offset, left offset, and effects volume to the data. The data can be placed in one of sixteen fixed stereo pan positions, or left and right offsets can be programmed to place the data anywhere in the stereo field. The left and right offset values can also be programmed to control the overall volume. Zipper noise is prevented by controlling the volume increment. A synthesizer LFO generator can ad LFO variation to: (i) the wavetable data addressing rate, for creating a vibrato effect; and (ii) a voice's volume, for creating a tremolo effect. Generated data to be output from the synthesizer is stored in left and right accumulators. However, when creating delay-based effects, data is stored in one of several effects accumulators. This data is then written to a wavetable. The difference between the wavetable write and read addresses for this data provides a delay for echo and reverb effects. LFO variations added to the read address create a chorus and flange effects. The volume of the delay-based effects data can be attenuated to pro…
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