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Frequency Modulation Using Digital Filtering Techniques

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1 Author(s)
Saltzberg, B. ; Bell Telephone Lab., Inc., Holmdel, N.J

A simple unstable second-order digital filter with one variable multiplier can provide a source of frequency-modulated signals. This modulator is readily time-shared and should prove attractive when a large number of transmitters are required. A system consisting of a multiple installation of identical binary frequency-shift keying data transmitters is described and analyzed. A refinement which totally eliminates amplitude and phase discontinuities is also presented.

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Communication Technology, IEEE Transactions on  (Volume:18 ,  Issue: 5 )