Pulse or digital communications – Repeaters – Testing
Patent
1982-05-21
1984-11-20
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 58, 179170R, H04B 336
Patent
active
044843364
ABSTRACT:
Feedback equalization is employed for digital repeaters of transmission systems having twisted-wire pairs, in order to reduce intersymbol interference while minimizing near-end crosstalk gain. Previously the incoming signal was selectively amplified at the higher frequencies in order to negate intersymbol interference, with subsequent near-end crosstalk gain. According to the present invention the intersymbol interference element of an incoming signal is cancelled, prior to amplification in an adder by a compensation signal derived from the output signal of a regenerator and a retimer. An output stage serves to amplify and shape the resultant signal to a form suitable for transmission. The compensation signal comprises the inverted output of a filtering and scaling network.
REFERENCES:
patent: 3304508 (1967-02-01), Danielsen et al.
patent: 3651265 (1972-03-01), Van Der Houwen
patent: 3980973 (1976-09-01), Hecken
patent: 4078157 (1978-03-01), Lender et al.
Catchpole Richard J.
Dyke Peter J.
Farley Brian S.
Virdee Harbhajan S.
Chin Stephen
Griffin Robert L.
Hill Alfred C.
International Standard Electric Corporation
O'Halloran John T.
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