Method and apparatus for generating sounds with tremolo and vibr

Details Method and apparatus for generating sounds with tremolo and vibr Method and apparatus for generating sounds with tremolo and vibr

1996-04-22

1998-07-14

Chan, Wing F.

Electrical audio signal processing systems and devices

Sound effects

Tremelo or vibrato effects

84629, H03G 300

Patent

active

057816360

ABSTRACT:
A digital sound generator with tremolo and vibrato sound effects is provided, which comprises: a source memory for storing different types of wave-tables; a first adder for adding a constant frequency and a step-varied frequency waveform to produce a tremulous frequency waveform; a register for storing a frequency address parameter from a central processing unit; an address generator for generating a frequency address in response to the frequency address parameter to said source memory to determine the type of signal waveform being outputted, so that said source memory produces a tremolo by playing the tremulous frequency waveform in the determined signal waveform; an amplitude generator for generating the amplitude of a normal sound; a second adder for adding the amplitude from the amplitude generator and an amplitude-variant signal from the source memory to produce a vibrato; and a synthesizer for synthesizing the tremolo and the vibrato to produce a sound with a special sound effect.

REFERENCES:
patent: 4021613 (1977-05-01), Kennedy
patent: 4957030 (1990-09-01), Suzuki
patent: 5010799 (1991-04-01), Tanaka et al.
patent: 5050216 (1991-09-01), Hanzawa et al.
patent: 5333203 (1994-07-01), Diaz
patent: 5386529 (1995-01-01), Kondo

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