Apparatus for controlling reproduction on pitch variation of an

Details Apparatus for controlling reproduction on pitch variation of an Apparatus for controlling reproduction on pitch variation of an

1989-06-07

1991-03-26

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84739, 84740, 84741, 84742, G10H 1053, G10H 106, G10H 118

Patent

active

050019600

ABSTRACT:
An input waveform signal representing, for example, a string oscillation is input to a pitch extraction circuit. The pitch extraction circuit extracts a pitch frequency from the input waveform signal, and this pitch frequency is input to a RAM connected to a CPU. On the other hand, LFO data from an LFO is input to a RAM. The CPU detects the amount of variation of the pitch frequency based on the pitch frequency and coverts the amount of variation of the pitch frequency in accordance with a predetermined conversion function. Thereafter the converted value is added to the LFO data to form musical sound control data for imparting a tremolo effect or a vibrato effect. The musical sound production circuit thereby imparts the above effect to the musical sound to be produced.

REFERENCES:
patent: 4117757 (1978-10-01), Akamatu
patent: 4280387 (1981-07-01), Moog
patent: 4606255 (1986-08-01), Hayashi et al.
patent: 4627323 (1986-12-01), Gold
patent: 4633748 (1987-01-01), Takashima et al.
patent: 4688464 (1987-08-01), Gibson et al.

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