H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/72
H04L 27/02 (2006.01) H04L 7/02 (2006.01) H04L 27/06 (2006.01)
Patent
CA 1123058
ABSTRACT OF THE DISCLOSURE A receiver for single carrier attenuated side-band amplitude-modulation data transmission system. The receiver comprises an amplitude-demodulating circuit designed to obtain from a signal coming on a line a three-level base-band signal, synchronization recovery means designed to obtain a receving clock from the base-band signal, decoding means controlled by the receiving clock and arranged to obtain a data signal from the base-band signal and phase-error detecting means to detect the phase error between a carrier extracted from the line signal and an ideal demodulation carrier by generating an error signal designed to eliminate such a phase error. The receiver is comprises reference means for generating a first and pair of voltage symmetric with respect to the each having an amplitude proportional to the peak value of the base-band signal. The synchronization recovery means comprises a first of threshold circuits designed to compare the base-band signal with the first pair of voltages symmetric, an adding circuit connected to the outputs of the first threshold circuits and having its output connected to a passband filter, and a phase-controlled oscillator controlled by a signal having the bit frequency of the signal at output the pass-band filter and generating a receiving clock.
337847
Italtel S.p.a.
Robic Robic & Associes/associates
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