Data modulator-demodulator apparatus of a spread spectrum commun

Details Data modulator-demodulator apparatus of a spread spectrum commun Data modulator-demodulator apparatus of a spread spectrum commun

1994-07-05

1995-07-11

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, H04L 2730

Patent

active

054328152

ABSTRACT:
In performing data communication between a subscriber terminal and a scanner of a remote information processing system, there is provided a data modulator-demodulator apparatus of a pseudo noise spread spectrum communication system for executing the data transmission and reception at a high speed, regardless of a voice speech use on a transmitting line. The transmitter part of the modulator-demodulator apparatus has a modulator which uses a pseudo noise code, generated by a pseudo noise code generator, to band spread real data, and the band spread data is converted to analog information by a transmitting converter for transmission over a transmitting line. The receiver part of the modulator-demodulator apparatus has a receiving converter which recovers operation clock data from the received analog signal, and converts a received analog signal to digital data. A demodulator in the receiver part then de-spreads the digital data in response to the pseudo noise code generated by the pseudo noise code generator.

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patent: 4641322 (1987-02-01), Hasegawa
patent: 4864586 (1989-09-01), Endo
patent: 5073899 (1991-12-01), Collier et al.
patent: 5132986 (1992-07-01), Endo et al.
G. E. Friend et al, Understanding Data Communications; Chap. 5, pp. 5-1 through 5-27; Howard W. Sams & Co.; Indianapolis, 1984.

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