Pulse or digital communications – Repeaters – Testing
Patent
1983-05-04
1985-03-26
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 58, 340347DD, H04B 112
Patent
active
045077940
ABSTRACT:
A system for digital transmission includes an active pulse forming network to convert a digital data signal into a Manchester Coded PSK format. A low pass filter network is provided to transform the Manchester Coded signal for transmission over a bandlimited wireline channel. The receiver includes a low pass filter and a bandpass filter that combine to form an overall bandpass filter response for receiving the output of the wireline channel. The transmitter low pass filter and the receiver bandpass filter combine to transform the Manchester Coded PSK data signal into a quasi-raised cosine signal that has the digital data signal coded therein. A timing recovery circuit is included that extracts a timing signal from the quasi-raised cosine signal to provide a coherent timing signal such that the quasi-raised cosine signal can be sampled and the digital data signal reconstructed. The timing recovery circuit delays the quasi-raised cosine signal and multiplies it by the reconstructed digital data signal and the product signal thereof is half-wave rectified and input to a phase lock loop which locks onto the signal to provide a reconstructed timing signal to drive a sampling circuit.
REFERENCES:
patent: 3419804 (1968-12-01), Gorog et al.
patent: 3947767 (1976-03-01), Koike et al.
patent: 4123710 (1978-10-01), Stuart et al.
patent: 4135057 (1979-01-01), Bayless, Sr. et al.
patent: 4439863 (1984-03-01), Bellamy
Johnston Donald A.
Jones Stephen K.
Chin Stephen
Griffin Robert L.
Howison Gregory M.
Medlock Nina L.
Mills Jerry W.
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