Patents Examined by O. C. Mis
  • Patent number: 4525685
    Abstract: A disciplined oscillator system having a standard oscillator which is automatically corrected for both frequency errors and time error accumulation to a constant frequency signal which is derived from the WWVB carrier frequency and the WWVB TIME CODE to maintain overall frequency accuracy within one part in 10.sup.9 notwithstanding oscillator aging and in spite of jitter and distortion due to propagation delays and noise which may cause loss of, or time jitter in, the WWVB signals. Frequency errors are detected through the use of a counter (24) having a measurement accuracy greater than one part in 10.sup.10. An error detector (26) derives correction signals by averaging a plurality of frequency variances obtained in successive measurement cycles.
    Type: Grant
    Filed: May 31, 1983
    Date of Patent: June 25, 1985
    Assignee: Spectracom Corp.
    Inventors: Robert J. Hesselberth, Thomas P. Donaher, Joel E. Sandahl