Digital message transmission system employing pulse stuffing and

Details Digital message transmission system employing pulse stuffing and Digital message transmission system employing pulse stuffing and

1983-01-12

1984-12-18

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375120, H04L 706

Patent

active

044894210

ABSTRACT:
A digital message transmission system has a transmit side wherein two pulse sequences are sampled at the rate of two plesiochronic data clocks and the sampled sequences are expanded by the insertion of additional information in the manner of "positive stuffing." The two pulse sequences including the additional information are transmitted to the receive side in a pulse frame, the procedure being reversed at the proceed side to decode the message. The momentary phase relationship between the two plesiochronic data clocks, in the form of a binary phase word, is inserted as a portion of the additional information. An auxiliary clock signal is derived from a reference data clock signal for use in transforming the phase measurement (difference between a higher and a lower frequency level) into the binary phase word. An auxiliary plesiochronic clock signal, which is plesiochronic relative to the auxiliary clock signal, is derived from the reference data clock signal and the plesiochronic data clock signal (plesiochronic relative to the data clock signal), the auxiliary plesiochronic clock signal being compared in phase to the auxiliary clock signal.

REFERENCES:
patent: 3855533 (1974-12-01), Schueli
patent: 3873773 (1975-03-01), Guy, Jr.
patent: 3961136 (1976-06-01), Cohen et al.
patent: 3970796 (1976-07-01), Gyurki
patent: 3970798 (1976-07-01), Epenoy et al.
patent: 4025720 (1977-05-01), Pachynski, Jr.
patent: 4053715 (1977-10-01), Drapkin
patent: 4072987 (1978-02-01), Walker
"Fundamental of Communications Using Pulse Code Modulation", H.-M. Christiansen et al., Siemens Review XLI (1974) pp. 257-262.
"Pulse Code Modulation and Multiplex Equipment for 30 and 120 Voice Circuits", J. Gier et al., Siemens Review XLI (1974), Special Issue, Communication Engineering, at pp. 269-275.

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