Digital sound synthesizer

Details Digital sound synthesizer Digital sound synthesizer

1986-02-24

1986-12-23

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

84 101, G10L 500

Patent

active

046317473

ABSTRACT:
A digital sound synthesizer produces a variable spectral line width to synthesize tones by accumulating phase quanta sequentially for each of a set of tone samples. The rate of accumulation of phase for each tone is randomly altered with preset values of phase increment to broaden the spectral line. The broadened spectral lines provide a display with a spectral presentation of sounds more closely resembling naturally occurring sounds. The embodiment shows how one-hundred non-harmonic frequencies can be generated (using integrator 64), each of which can be independently amplitude controlled and band-width modulation controlled using random deviation of a sine wave.

REFERENCES:
patent: 3818478 (1974-06-01), Groginsky
patent: 3821714 (1974-06-01), Tomisawa
patent: 3878750 (1975-04-01), Kapps
patent: 3913442 (1975-10-01), Deutsch
patent: 3952623 (1976-04-01), Deutsch
patent: 3978755 (1976-09-01), Woron
patent: 4023454 (1977-05-01), Obayashi et al.
patent: 4038898 (1977-08-01), Kniepkamp et al.
J. Tierney, "A Digital Frequency Synthesizer", IEEE Trans. Audio Elec., Mar. 1971, pp. 48-56.

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