Modem for rf subscriber telephone system

Details Modem for rf subscriber telephone system Modem for rf subscriber telephone system

H - Electricity

03

C

332/1

H03C 3/02 (2006.01) H04L 27/20 (2006.01) H04L 27/227 (2006.01)

Patent

CA 1324642

ABSTRACT OF THE DISCLOSURE This is directed to a modulator for a modem. The modulator converts a bit stream, in which a predetermined number of bits form a symbol, into a phase modulated intermediate frequency (IF) signal. To perform this function, the modulator converts the bits of the bit stream that form symbols using phase locked DPSK. The phase modulated symbols are digitally filtered to produce a filtered signal that includes time shared, digital in-phase and quadrature-phase components that, when converted to an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviation from that frequency is according to the value of the phase modulated symbols. The filtered analog signal is filtered again and then passed to a mixer for up-conversion to the IF signal.

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