Multiplex communications – Wide area network – Packet switching
Patent
1978-10-26
1981-12-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370118, H04J 1500
Patent
active
043086144
ABSTRACT:
This invention provides means and method of eliminating a selected wave from a frequency band containing a plurality of waves, by sampling the plurality of waves at a rate greater than the nyquist rate for the frequency band in herz, at instants at which the selected wave has zero amplitude, and integrating the sequence of samples so obtained to produce a replica of the plurality of waves less the selected wave.
The plurality of waves less the selected wave may be subtracted from the plurality of waves, after adjustment of relative amplitude and delay, so that the selected wave is obtained substantially free of other waves of the plurality of waves.
Thus a selected undesired wave, with a maximum period between successive instants of zero amplitude of less than the nyquist interval for the frequency band, may be substantially eliminated without affecting other waves; a selected desired wave, with a maximum period between successive instants of zero amplitude of one-half the period of the bandwidth of the frequency band, may be recovered substantially free from noise.
REFERENCES:
patent: 3204034 (1965-08-01), Ballard et al.
patent: 3969585 (1976-07-01), Boulanger
patent: 4075427 (1978-02-01), Mattsson et al.
patent: 4105977 (1978-08-01), Fitting et al.
Information Transmission, Modulation, and Noise by Schwartz, McGraw-Hill, pp. 125, 126, 1970.
R. Weiss, "Heart Sound Discriminator . . . " Electronics 34:24 p. 52, 1968.
Prigozy, "Zero-Crossing Detector . . . " Electronics Apr. 19, 1965 p. 91.
Ferrar, "Delayed Output Pulse Generator" EEE 13:10 p. 71, 1968.
H. S. Black, "Modulation Theory" New York 1953 p. 68 & 176 to 179.
"Comments on Notice of Proposed Rule Making", FCC released 10-19-78.
Fisher Charles B.
Fisher Sidney T.
LandOfFree
Noise-reduction sampling system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise-reduction sampling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise-reduction sampling system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1021299