Wavetable cache using simplified looping

Details Wavetable cache using simplified looping Wavetable cache using simplified looping

Filed on

1998-06-10

Date issued

2000-08-08

Examiner

Witkowski, Stanley J.

Patent Class

Music

SubClass

Instruments

SubSubClass

Electrical musical tone generation

Other Related Categories

84602, 84604, 84622, 84659, G10H 700

Type

Patent

Status

active

Patent number

061004618

Description

ABSTRACT:
A wavetable audio synthesis system includes a simplified burst data transmission interface and a modified wavetable data structure in a system memory to transfer wavetable data from the system memory to a wavetable audio synthesis device with reduced hardware complexity. The system memory is configured to store voice data in patches including a plurality of voice data samples beginning at an initial address and extending through a plurality of ramp voice data samples to a starting loop address. The voice data in the patches then includes a plurality of looping voice data samples from the starting loop address to an ending loop address. The voice data patches are extended by repeating the voice data samples beginning with the sample at the starting loop address and extending toward the samples at the ending loop address. The number of repeated samples extend for a number of samples equal to the size of a burst transfer. The repeated samples are appended to the voice data patches following the ending loop address.

REFERENCES:
patent: 5677503 (1997-10-01), Kurata
patent: 5689080 (1997-11-01), Gulick
patent: 5717154 (1998-02-01), Gulick
patent: 5753841 (1998-05-01), Hewitt
patent: 5809342 (1998-09-01), Gulick
patent: 5847304 (1998-12-01), Hewitt
patent: 5890115 (1999-03-01), Cole

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