G - Physics – 06 – F
Patent
G - Physics
06
F
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G06F 7/548 (2006.01) H04L 27/12 (2006.01) H04L 27/20 (2006.01)
Patent
CA 1269420
IMPROVED METHOD AND APPARATUS FOR GENERATING DIGITAL SIGNALS REPRESENTING PERIODIC SAMPLES OF A SINE WAVE Abstract A method and apparatus for generating accurate digital representations of one or more sine waves. A digital signal processor is used to generate the sample digital values, spaced at period T, of a sine wave of frequency F, F < Image using recursive methods. The magnitude of the generated sample values is stabilized and controlled by normalizing the recursively generated samples from time to time, but not necessarily after each recursive calculation. Methods are described for generating values based on the values of two previously generated samples using the recursion formula: y(n) = y(n-1)2cosuu - y(n-2) where .omega. = 2.pi.FT and y(n), y(n-1) and y(n-2) represent three consecutive sample values. The normalizing factor, used for multiplying a recursively generated sample value to stabilize the amplitude, associated with this calculation is Image where A is the desired amplitude. Methods are also described for generating two sine waves of the same frequency but displaced in phase, and for generating frequency and phase-shift keyed sine waves. Advantageously, these methods and apparatus minimize the resources required for performing the generation of the sine waves.
536017
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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