Digital telephone system noise reduction circuit

Details Digital telephone system noise reduction circuit Digital telephone system noise reduction circuit

H - Electricity

04

M

H04M 3/18 (2006.01) H04Q 1/442 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2091737

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 and a pulse generator. To eliminate audible noise resulting from the filter action, the ASK signal or the pulses from the pulse generator is shifted in phase by about 90° before application to a filter. The result is significantly reduced noise.

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