Digital psk modulator for modem

Details Digital psk modulator for modem Digital psk modulator for modem

H - Electricity

03

C

332/60

H03C 3/00 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1195740

"IMPROVED DIGITAL PSK MODULATOR FOR MODEM" Abstract of the Disclosure An improved four-phase differential phase shift keyed modulator for use in a modem is shown. A microprocessor (15) generates two vectors of equal frequency and equal magnitude, but different relative phases, by reference to a cyclic sine table contained in a read only memory (22). Values of the two vectors are summed and provided as an output (32) to a digital to analog converter (35). The phase shift of the carrier in a phase plane with reference to a predetermined reference phase (86) shows that the path taken by a vector in the phase plane defines a straight line (88) between two phase values by which dibits are encoded. The result is lower out-of-band transmitted signals resulting in a relatively simple transmit filter (37).

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