Boots – shoes – and leggings
Patent
1987-06-01
1989-12-26
Lall, Parshotam S.
Boots, shoes, and leggings
328 59, 307523, H04L 2712, G06F 102
Patent
active
048902489
ABSTRACT:
A method and apparatus for reducing the introduction of alias frequencies in the processing of signals. A sequence of jittered pulses is provided, each pulse occurring during one of a sequence of time intervals of duration T at a time determined by a sequential one of a set of independent random numbers having a uniform probability density in a region bounded by zero and T. A signal processing operation, such as sampling a signal or synthesizing a signal having a desired frequency specified by a control signal, is performed in response to the jittered pulses. Setup time aliasing is avoided by alternating between two signal processors, each driven by one of a pair of phase-related sequences of jittered pulses, or, in the case of a frequency synthesizer, by jittering the output signal rather than the input pulses. Phase noise in a synthesized signal is reduced by scaling the control signal according to the durations of the time intervals between successive jittered pulses.
REFERENCES:
patent: 4112425 (1978-09-01), Zobrist et al.
patent: 4136326 (1979-01-01), Naudot et al.
patent: 4142146 (1979-02-01), Schumann et al.
patent: 4176399 (1979-11-01), Hoffmann et al.
patent: 4188583 (1980-02-01), McCurdy
Denson-Low Wanda
Hughes Aircraft Company
Lall Parshotam S.
Mitchell Steven M.
Ramirez Ellis B.
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