Waveform generation system with reduced memory requirement, for

Details Waveform generation system with reduced memory requirement, for Waveform generation system with reduced memory requirement, for

1989-11-07

1993-09-14

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84663, G10H 700, G11C 000

Patent

active

052451267

ABSTRACT:
A waveform data storing unit stores waveform data only at steps midway among a top zero level step and originally sampled steps at every sampling period from the top zero level step. An output means is included for outputting the waveform data at a moment staggered from another moment, at which the waveform data at the top zero level step and the originally sampled steps are ordinarily read out, by a period of time corresponding to half a step. The occurrence of a difference in phase of the read-out waveform is prevented without the need of a data correction unit. The waveform data storing unit stores midway-step data which are averages of waveform data at adjoining originally sampled steps and difference data representing the difference between the waveform data at the originally sampled steps and the midway-step data. A fine waveform can therefore be obtained while using a smaller quantity of data.

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