Pulse or digital communications – Repeaters – Testing
Patent
1979-12-10
1981-02-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
370 20, 375 39, 375 43, 375 50, 375 15, H04L 512, H04L 2302
Patent
active
042531861
ABSTRACT:
A method and a device which, in a receiver forming part of a data transmission system using DSB-QC modulation, permit detecting the beginning of a pseudo-random sequence of symbols pertaining to a first set of two symbols when this sequence is preceded by a sequence of successive alternations between two symbols pertaining to a second set, with the first and second sets being such that the beginning of said pseudo-random sequence will initiate a reversal of the phase of the components of the frequency spectrum of said sequence of alternations. In accordance with the method of the present invention, the received signal is demodulated, the DC component of the demodulated signal is determined, and the energy of that DC component is measured. The time at which said energy drops below its average value is indicative of the beginning of the pseudo-random sequence. In accordance with one aspect of the invention, the DC component of the demodulated signal is determined by passing the signal through a lowpass filter.
REFERENCES:
patent: 3378770 (1968-04-01), Daguet
patent: 3443229 (1969-05-01), Becker
patent: 3518680 (1970-06-01), McAuliffe
patent: 4100376 (1978-07-01), Woythaler
Frisone John B.
International Business Machines - Corporation
Safourek Benedict V.
LandOfFree
Method and device for detecting a pseudo-random sequence of two 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 device for detecting a pseudo-random sequence of two , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for detecting a pseudo-random sequence of two will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1412821