Frame step-out detecting system

Details Frame step-out detecting system Frame step-out detecting system

1987-03-24

1989-06-06

Fleming, Michael R.

Excavating

371 43, 371 45, 375 17, G06F 1110

Patent

active

048377660

ABSTRACT:
A frame step-out detecting system includes on the transmission side, a first violation unit, a modulating means and, on the reception side, a demodulating means, a second violation unit, and an error detector. The first violation unit includes a convolutional encoder and subjects data to be transmitted to violation. The modulating means modulates a carrier by an output from the first violation unit and outputs it to a transmission path. The demodulating means demodulates a signal supplied from the transmission path. The second violation unit includes a Viterbi decoder and subjects an output signal from the demodulating means to violation. The error detector monitors an internal state of the second violation unit, detects a step-out of violation in the first and second violation units, and outputs a signal representing frame step-out.

REFERENCES:
patent: 4077021 (1978-02-01), Csajka
patent: 4527279 (1985-07-01), Yasuda
patent: 4539684 (1985-09-01), Kloker
patent: 4578800 (1986-03-01), Yasuda
patent: 4583236 (1986-04-01), Kromer
patent: 4601044 (1986-07-01), Kromer
patent: 4639548 (1987-01-01), Oshima
patent: 4675871 (1987-06-01), Gorden
Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, "The Viterbi Algorithm".

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