Variable speed asynchronous modem

Details Variable speed asynchronous modem Variable speed asynchronous modem

H - Electricity

03

C

H03C 3/00 (2006.01) H04H 20/67 (2009.01) H03D 3/00 (2006.01) H04L 25/38 (2006.01) H04L 27/12 (2006.01) H04L 27/152 (2006.01) H04H 3/00 (2006.01)

Patent

CA 2126342

2126342 9315551 PCTABS00024 A modulator (26) and a demodulator (30) are for use in a simulcast paging system. The modulator (26) samples a non-return-to-zero input, interpolates transitions between logic levels and produces a frequency shift keyed filtered signal at a center frequency different than that used for transmitting. The demodulator (30) digitizes and shifts the signal to a center frequency of zero Hertz producing a complex baseband, and from an interpolation of the time derivative of the instantaneous phase determines the logic level of signal.

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