Line transmission systems

Details Line transmission systems Line transmission systems

H - Electricity

03

M

354/106

H03M 5/20 (2006.01) H04L 5/04 (2006.01) H04L 25/49 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1221170

ABSTRACT In a local area PCM telephone network in which pulse coded speech signals are Walsh-code modulated and transmitted in burst mode between a subscriber's apparatus and the exchange, the data rate may be doubled for a given line symbol rate by transmitting each Walsh-code symbol at one of two amplitude levels in dependence upon the values of the added data bits.

421748

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