Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1991-03-21
1996-06-04
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
4552261, 455324, 375340, H04B 1700
Patent
active
055242820
ABSTRACT:
An apparatus and a method utilized in the field of time division multiplex digital communications or the like for detecting the place of burst signals. A transmitter transmits a carrier wave modulated by message data signals having a reference signal inserted between them, and a receiver receives the transmitted modulated carrier wave. In the receiver, the received modulated carrier wave is demodulated by both a sine wave and a cosine wave each having an angular frequency deviation .DELTA..omega. relative to the received carrier waved, the phase difference between the demodulated message data signals and the modulated reference signal is detected, the time-based change of the detected phase difference is approximated by a function of low order, the error between the phase of the received reference signal and that computed on the basis of the approximation function is computed, and a burst place detection signal is generated when the computed error is smaller than a predetermined threshold value.
REFERENCES:
patent: 4401860 (1983-08-01), Walls
Honma Kouichi
Tsubaki Kazuhisa
Uesugi Mitsuru
Eisenzopf Reinhard J.
Matsushita Electric - Industrial Co., Ltd.
Sobutka Philip J.
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