Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-03-07
1991-01-08
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
324 79R, 328141, H04L 700
Patent
active
049842544
ABSTRACT:
A frequency counter for counting pulses of a variable input signal (Fin) using another input signal (Fgate) of a different, fixed frequency as a reference, includes a noise-shaping synchronizer (20,23,24) for retiming pulses of the lower frequency input signal to have a fixed timing relationship with selected pulses of the higher frequency input signal such as to introduce substantially less phase noise onto the lower frequency input at low modulation rates that would be the case with a simple synchronizer; and a counter and a latch (11,12) responsive to the retimed pulses (13) and to the higher frequency input signal (Fin) to provide a data output representative of the ratio between the frequencies of the input signals.
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Toute L'Electronique, No. 456, Aug.-Sep. 1980, pp. 71-74, Paris, FR; L. Chataignier: "Philips: les frequencemetres a haute resolution, pm 666/68".
E.D.N. Electrical Design News, vol. 28, No. 17, Aug. 1983, p. 211, Boston, Mass., U.S.: M. E. Satinosky: "PLL measures low frequencies".
Soviet Inventions Illustrated, week 8338, Nov. 2, 1983, abstract No. 770415/38, Derwent Pub., Ltd, London, GB: & SU-A-976-396 (V. F. Tikhomirov) 11-23-1982.
IEEE Transactions on Instrumentation and Measurement, vol. IM-19, No. 1, Feb. 1970, pp. 34-45; W. H. Farthing: "Wide-band High-resolution Determination of Absolute Frequency:" p. 36, Chapter 2: Solution.
New Electronics, vol. 18, No. 8, Apr. 1985, pp. 34, 36, 38, 39, 41, London, GB; G. Carter et al.: "Counter Technology Emerges for the 1990s"; Figure 3.
Chin Stephen
Marconi Instruments Limited
Safourek Benedict V.
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