Receiver for use in a multi-level code transmission system

Details Receiver for use in a multi-level code transmission system Receiver for use in a multi-level code transmission system

1974-02-01

1976-08-31

Morrison, Malcolm A.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 73DC, 325 38A, H04B 100

Patent

active

039782840

ABSTRACT:
A multi-level code transmission system for restoring the d.c. component of a received signal by peak-clamping of the peak of the received synchronizing signal to a fixed level so as to establish the synchronization of a receiving end prior to an establishment of synchronization at the receiving end and for effecting pulse-clamping of the reference level of a following received signal after the establishment of synchronization at the timing of a clamping pulse relating to the synchronizing signal. In the case of transmitting a multi-level code signal such as an audio PCM signal together with an analogue signal such as a picture signal alternately, for example in a still picture transmission system, the d.c. level of the received signal is varied due to the low cutoff frequency characteristic of the transmission line, the result of which is the occurrence of a code error in a reproduced code signal at the receiving end. In order to obviate such a code error, the present invention uses two kinds of clamping, i.e., peak-clamping and pulse-clamping before and after the establishment of synchronization at the receiving end, respectively. According to this invention, the multi-level code signal can be reproduced with high fidelity.

REFERENCES:
patent: 3579123 (1971-05-01), Koga
patent: 3619648 (1971-11-01), Wolber
patent: 3731199 (1973-05-01), Tazaki et al.
patent: 3733550 (1973-05-01), Tazaki et al.
patent: 3813483 (1974-05-01), Kurosawa et al.

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