Tone signal generator for producing multioperator tone signals using an operator circuit including a waveform generator, a selector and an enveloper
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United States of America Patent
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Sep 9, 1997
Grant Date -
N/A
app pub date -
Jun 30, 1995
filing date -
Jun 30, 1995
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Abstract
A frequency modulation (FM) tone signal generator for generating a FM tone signal is disclosed. The tone signal generator includes a waveform generator having a plurality of wave tables, a selector and an enveloper. The waveform generator furnishes a waveform signal in response to a phase angle address signal. Each wave table stores a different waveform. The selector selects one of the wave tables in response to a plurality of selection signals such that the selected wave table largely provides the waveform signal upon being addressed largely by the phase angle address signal. Selection of the selected wave table varies with each selection signal. The enveloper impresses an envelope signal on the waveform signal. The envelope signal is used as a carrier or modulator for generating the FM tone signal.
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