PCM channel monitoring system for detecting errors using single

Details PCM channel monitoring system for detecting errors using single PCM channel monitoring system for detecting errors using single

1978-07-31

1980-01-08

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401461AG, H04B 100

Patent

active

041829883

ABSTRACT:
A channel monitoring system for a carrier wave differential phase modulation PCM transmission system is disclosed. Channel monitoring is accomplished with only one parity bit for one monitoring section of a PCM signal by making use of the correlation in the occurrence of errors due to an error in phase in the transmission path. The PCM signal is monitored at alternate code time slots with the parity check system so that a single code error to an adjacent phase in one parity monitoring section can be detected as a single bit error. Therefore, an error in one parity monitoring section can be reliably detected with the one parity bit so long as the error occurs only once in one monitoring section.

REFERENCES:
patent: 3585586 (1971-06-01), Harmon et al.
patent: 3891959 (1975-06-01), Tsuji et al.
patent: 3940736 (1976-02-01), Inaba et al.
patent: 4003020 (1977-01-01), Clarke

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