Digital telephone system circuits

Details Digital telephone system circuits Digital telephone system circuits

H - Electricity

04

M

379/57

H04M 3/22 (2006.01) H04J 3/12 (2006.01)

Patent

CA 2027244

A telephone system uses above voice-band ASK control and supervisory signals which are appended to digitally encoded voice by forcing the least significant bits to a selected level for transmission to the receiving end. At the receiving end, the ASK is regenerated by a circuit including special filter. To eliminate audible noise resulting from the filter action, the ASK signal is applied to a shaping circuit which shapes the leading and trailing ASK envelope into a gradually increasing and decreasing envelope. To detect the proper number of pulses in the signal, a threshold detector is used which follows the envelope, ignoring peaks of low amplitude after peaks of high amplitude.

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