Simultaneous voice pitches in a polyphonic tone synthesizer

Details Simultaneous voice pitches in a polyphonic tone synthesizer Simultaneous voice pitches in a polyphonic tone synthesizer

1979-08-09

1981-03-24

Truhe, J. V.

Music

Instruments

84 101, G10H 106

Patent

active

042573041

ABSTRACT:
In a musical instrument having one or more tone generators in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced reference points defining the waveform of an audio signal are transferred sequentially from a note register to a digital-to-analog converter in repetitive cycles at a rate proportional to the pitch of the tone being generated, apparatus is provided for simultaneously creating tones at two different pitches. The reference points are computed using specified wave shape symmetry characteristics such that a single variable frequency oscillator suffices to generate both tone pitches without requiring separate, or time shared, tone generation channels.

REFERENCES:
patent: 3992970 (1976-11-01), Chibana et al.
patent: 4089644 (1978-04-01), Deutsch et al.
patent: 4122742 (1978-10-01), Deutsch

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