Method and apparatus for frequency modulation synthesis

Details Method and apparatus for frequency modulation synthesis Method and apparatus for frequency modulation synthesis

1997-10-14

2000-01-04

Kinkead, Arnold

Modulators

Frequency modulator

327106, 327107, 364721, 84622, 84624, 84696, G10H 500, G06F 102

Patent

active

060114487

ABSTRACT:
A method for frequency modulation synthesis and apparatus for performing the method. The method uses additions rather than multiplies and therefore saves the space and cost of multipliers in circuit implementations. The method saves further resources by using the coordinate rotation digital computer (CORDIC) algorithm to acquire sine values as opposed to an extensive sine look-up table. The method can be implemented with either a dedicated digital circuit or a programmed special purpose processor such as a digital signal processor. The hardware for implementing the method is normally integrated onto a semiconductor device.

REFERENCES:
patent: 4018121 (1977-04-01), Chowning
patent: 4249447 (1981-02-01), Tomisawa
IRE Transactions on Electronic Computers, "The Cordic Trigonometric Computing Technique" by Jack E. Volder.
1980 IEEE, "Music Synthesis Using Real Time Digital Techniques" by Harold G. Alles.
Computer Music Journal, vol. 3, #3, pp. 28-36, "An Inexpensive Digital Sound Synthesizer" by H. G. Alles, Bell Laboratories, Murray Hill, NJ 07974.
Journal of the Audio Engineering Society, pp. 526-534, "The Synthesis of Complex Audio Spectra by Means of Frequency Modulation", by John M. Chowning, Stanford Artificial Intelligence Laboratory, Stanford, CA.
Dr. Dobb'Journal, Oct. 1990, pp. 152-158, "Implementing Cordic Algorithms", by Pitts Jarvis.
Yamaha.RTM.L S1 OPL3 YMF262 FM Operator Type L2 Application Manual, CAtalog #LS1-6MF2622, 1987, Yamaha Corporation, Japan.

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