Telephone system digital channel bank interface

Details Telephone system digital channel bank interface Telephone system digital channel bank interface

H - Electricity

04

J

344/18

H04J 3/12 (2006.01) H04L 25/49 (2006.01) H04M 1/00 (2006.01) H04M 3/42 (2006.01) H04M 9/00 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1320556

TELEPHONE SYSTEM DIGITAL CHANNEL BANK INTERFACE Abstract of the Disclosure 8kHz ASK signals are produced by an electronic business set instrument to function as control or feature signals. To avoid the problems of transmitting the 8kHz ASK over voiceband telephone lines over long distance, the least significant bit (LSB) of each 8 bit word representative of voice signals is caused to be at a predetermined level (e.g., low) when an ASK signal is present and at the other level (e.g., high) when there is no ASK. At the receiving end, the state of the bit is used to regenerate the 8kHz. Detection of the ASK is performed by a high-pass filter.

608740

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