Music – Instruments – Electrical musical tone generation
Patent
1995-04-07
1999-05-04
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84660, 84661, 84663, 84DIG9, G10H 1057, G10H 108, G10H 112
Patent
active
059005700
ABSTRACT:
This invention provides a circuit for synthesizing musical sounds. In one embodiment, the circuit includes a first order FIR highpass filter that is placed between a modulation phase increment oscillator and a carrier phase increment oscillator. The invention may also include waveshaping circuits, adders, multipliers, time division multiplexing, and other types of filters. Another embodiment of the invention provides a music synthesis method where a modulation phase increment is multiplied by a modulation index to produce a modulation signal. That modulation signal is then filtered and added to a carrier phase increment. Finally, that sum is multiplied by an amplitude envelope to produce a signal representing a musical sound. The method may include using a first order FIR highpass filter, waveshaping of both sinusoidal and non-sinusoidal waveforms, additional multiplying and time division multiplexing. The invention also includes self-modulation and cascading.
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Creative Technology Ltd.
Witkowski Stanley J.
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