Amplitude modulated telephone carrier system and terminal...

Details Amplitude modulated telephone carrier system and terminal... Amplitude modulated telephone carrier system and terminal...

H - Electricity

04

J

363/5, 363/8

H04J 1/12 (2006.01) H04J 1/08 (2006.01)

Patent

CA 1126885

ABSTRACT OF DISCLOSURE A plural channel amplitude modulated frequency division multiplexed station carrier system wherein the receivers of the subscriber and central office channel terminal circuits are each equipped with a bandpass filter which is tuned to the carrier frequency to be received and with a circuit for synchronously detecting the carrier signal to which the bandpass filter is tuned. In the sub- scriber channel terminal circuits the bandpass filters are of the first order type, and in the central office channel terminal circuits the order of each bandpass filter is no greater than two. Carrier signal level adjustment is provided at the subscribers' end of the carrier system's transmission line for the purpose of causing all of the central office transmitted carrier signals to arrive at the subscriber channel terminal receivers at or at least approximately at a common level and for the additional purpose of causing all of the subscriber transmitted carrier signals to arrive at the central office channel terminal receivers at or at least approximately at a common level.

322836

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