Digital signal processor for adding harmonic content to digital

Details Digital signal processor for adding harmonic content to digital Digital signal processor for adding harmonic content to digital

1992-06-29

1996-06-04

Chan, Wing F.

Electrical audio signal processing systems and devices

Sound effects

Tremelo or vibrato effects

84618, 84656, H03G 300

Patent

active

055240747

ABSTRACT:
A digital audio signal processor for adding harmonic content to an input audio signal through a non-linear transfer function with discontinuities. The discontinuities are generated by bit shifting each input value by an amount dependent on the sign and magnitude of the input value. The amount by which the input value is shifted is roughly inversely related to the magnitude of the logarithm of the input value. The transfer function is fractal and so provides increased harmonic content for all signal amplitudes.

REFERENCES:
patent: 4211138 (1980-07-01), Deutsch
patent: 4282790 (1981-08-01), Wachi
patent: 4991218 (1991-02-01), Kramer
patent: 5134919 (1992-08-01), Kunimoto
Texas Instruments specification, TTL Devices pp. 3-555-3-556.
Marc Le Brun, Digital Wave-Shaping Synthesis, Journal of the Audio Engineering Society Apr. 1979, vol. 37, No. 4.

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