Boots – shoes – and leggings
Patent
1984-09-19
1988-12-27
Harkcom, Gary V.
Boots, shoes, and leggings
G06F 738
Patent
active
047945567
ABSTRACT:
In-phase and quadrature components of a waveform are generated by sampling the waveform at a rate of four times the center frequency of the frequency band for which components are generated. The samples are digitized and applied to a digital 90.degree. all-pass phase-splitting network. Each pair of output samples is generated as a function of input samples delayed by an even number of time instants through a first all-pass branch and delayed by an odd number of time instants through a second all-pass branch. A common network may form both branches by switching coefficients of a multiplier and alternating the output between in-phase and quadrature samples. The waveform may be shifted from a higher freqeuncy by a mixer and may be filtered prior to sampling.
REFERENCES:
patent: 4125866 (1978-11-01), van Essen et al.
patent: 4184129 (1980-01-01), Macchi nee Danjon et al.
patent: 4216463 (1980-08-01), Backof, Jr. et al.
patent: 4247940 (1981-01-01), Mueller et al.
patent: 4344040 (1982-08-01), Reilly et al.
patent: 4393456 (1983-07-01), Marshall, Jr.
patent: 4435773 (1984-03-01), Gockler et al.
patent: 4475211 (1984-10-01), Mattis, Jr. et al.
patent: 4489418 (1984-12-01), Mazo
patent: 4519084 (1985-05-01), Langseth
patent: 4534043 (1985-08-01), Krishnan
patent: 4665494 (1987-05-01), Tanaka et al.
Jackson et al., "An Approach to the Implementation of Digital Filters", IEEE Trans. Audio and Electroacoustics, vol. AV #16, #3, pp. 413-421, Sep. 1968.
Esteban, "Direct Form Digital Filter Using Floating Point Arithmetic", IBM Tech. Disclosure Bulletin, vol. 15, #8, pp. 2529-2530, Jan. 1973.
Thirion, "Multiplex Digital Filtering Technique", IBM Tech. Disclosure Bulletin, vol. 16, #12, pp. 3942-3943, May 1974.
Nussbaumer, "Discrete Transforms Filter", IBM Tech. Disclosure Bulletin, vol. 18, #12, pp. 4048-4053, May 1976.
Mitra et al., "On the Implementation of a Two-Dimensional FIR Filter Using a Single Multiplier", IEEE Trans. on Computers, vol. C-27, #8, pp. 762-764, Aug. 1978.
Vopni et al., "A CMOS Time-Multiplexed Digital Filter for Vocoder Applications", Can. Elec. Eng. J., vol. 7, #1, pp. 30-35, 1982.
Bernard Gold and Joseph Tierney, "Digitized Voice-Excited Vocoder for Telephone-Quality Inputs, Using Bandpass Sampling of the Baseband Signal," The Journal of Acoustical Society of America, vol. 37, No. 4, 753-754, Apr. 1965.
R. Boite and H. Leich, "The Digital Channel Bank", PROC. IEE, vol. 122, No. 4, pp. 340-344, Apr. 1975.
Bernard Gold and Charles M. Rader, Digital Processing of Signals, pp. 90-92, 1969.
Harkcom Gary V.
Massachusetts Institute of Technology
Shaw Dale M.
LandOfFree
Method and apparatus for sampling in-phase and quadrature compon 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 sampling in-phase and quadrature compon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for sampling in-phase and quadrature compon will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-872572