Digital modulator

Details Digital modulator Digital modulator

H - Electricity

04

L

332/87

H04L 27/12 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1289634

ABSTRACT DIGITAL MODULATOR Signal modulation apparatus for the transmission of binary data signals embodying a process which results in superior side-lobe suppression compared with other forms of modulation such as frequency shift keying. The apparatus generates two carrier waves, the difference between whose frequencies Is an integral multiple of the data signal bit-rate, amplitude modulates the two waves by a low-pass filtered data signal and an inverted version thereof respectively and then sums the resulting modulated waveforms to produce a frequency keyed waveform having continuous phase and almost negligible envelope ripple. The apparatus can be used with most forms of digital communication systems and may be demodulated by a conventional receiver such as ratio detector or phase-locked loop.

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