Pulse or digital communications – Repeaters – Testing
Patent
1981-02-17
1983-06-14
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 81, 329112, 329122, H04L 2714, H04B 126
Patent
active
043887279
ABSTRACT:
A receiver, for receiving a signal comprising a carrier signal modulated with a digital signal, comprises means for demodulating the received signal to produce an output signal which contains the digital signal. Because of repeated filtering, the digital signal is typically in the form of an approximately sinusoidal signal, which has a component whose frequency is equal to half the basic bit rate of the digital signal: because of noise, this component is subject to considerable timing jitter. To overcome this, the output signal is digitized and applied to a digital correlator, where it is correlated with a reference signal whose frequency is also equal to half the basic bit rate of the digital signal. The reference signal is preferably derived from a phase-locked loop locked to the carrier frequency. The correlator, which is constituted by a microprocessor, determines the instants of time which most nearly coincide with the mean-level crossing points of said component (which instants correspond to transitions between one bit of the digital signal and the next), and also determines successive bit values on the basis of the coincidence determination. The receiver can be used to receive mains-borne signals, i.e. signals transmitted over an electrical power supply network, or radio broadcast signals. The received signals employ at least one of two or more carrier frequencies derived from a common oscillator, and the receiver includes a phase locked loop capable of locking a local oscillator in the receiver to whichever of the carrier frequencies is being received.
REFERENCES:
patent: 3163823 (1964-12-01), Kellis et al.
patent: 3371281 (1968-02-01), Powell
patent: 3490044 (1970-01-01), Easton
patent: 3873931 (1975-03-01), Basse et al.
patent: 4053836 (1977-10-01), Fellrath
patent: 4166979 (1979-09-01), Waggener
patent: 4291275 (1981-09-01), Nossen
Chin Stephen
Gaudier Dale
Safourek Benedict V.
Sangamo Weston Limited
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