Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-02-02
1977-10-11
Stewart, David L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325136, 325331, 333 18, H04J 1100
Patent
active
040537137
ABSTRACT:
The sum and difference signals of a pair of data channels are applied to a pair of roll-off filters, respectively. The outputs of said roll-off filters are modulated by a pair of carrier signals which have the phase difference (.pi./2) to each other. The modulated signals are added to each other in an adder and a single output signal is provided from the output of said adder. Said output signal and another output signal relating to another pair of data channels, and some pilot signals are applied to an adder, the output of which is transmitted to a receiving station in the form of a multi-channel multiplex data signal. At the receiving station, the received signal is demodulated with the inverse process of the above modulation steps and the demodulated data signals are applied to an automatic equalizer. The present invention described above provides high speed data transmission through a narrow-band-line which has only almost the Nyquist band width.
REFERENCES:
patent: 3163718 (1964-12-01), Deman
patent: 3443229 (1969-05-01), Becker
patent: 3488445 (1970-01-01), Chang
patent: 3813483 (1974-05-01), Kurosawa
OKI Electric Industry Co., Ltd.
Stewart David L.
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