Boots – shoes – and leggings
Patent
1986-07-29
1988-08-02
Harkcom, Gary V.
Boots, shoes, and leggings
G06F 1531
Patent
active
047617519
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<1/2T, 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)2 cos.omega.-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 ##EQU1## 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.
REFERENCES:
patent: 3636337 (1972-01-01), Dietel et al.
patent: 3649821 (1972-03-01), Gumacos
patent: 3679881 (1972-07-01), Gondeck
patent: 4135422 (1979-01-01), Chibana
patent: 4159526 (1979-06-01), Mosley, Jr. et al.
patent: 4285044 (1981-08-01), Thomas et al.
patent: 4577287 (1986-03-01), Chrin
patent: 4618966 (1986-10-01), Stepp et al.
Gold et al., "Digital Processing of Signals", McGraw-Hill, 1969, pp. 146-149.
Tierney et al., "A Digital Frequency Synthesizer", IEEE Transactions on Audio and Electroacoustics, vol. AU-19, No. 1, Mar. 1971, pp. 48-56.
Rabiner et al., "Theory and Application of Digital Signal Processing", Prentice-Hall, 1975, pp. 563-565.
McAuliffe, "Digital Sample Oscillator", IBM Tech Disclosure Bulletin, vol. 15, No. 4, Sep. 1972, pp. 1126-1127.
American Telephone and Telegraph Company AT&T Bell Laboratories
Harkcom Gary V.
Mai Tan V.
Ulrich Werner
LandOfFree
Method and apparatus for generating digital signals representing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for generating digital signals representing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for generating digital signals representing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-714778