H - Electricity – 04 – L
Patent
H - Electricity
04
L
332/32, 325/35,
H04L 27/12 (2006.01)
Patent
CA 1129103
Farrow-16 11. ONE-BIT FREQUENCY-SHIFT KEYED MODULATOR Abstract of the Disclosure A shift keyed modulator utilizes a lookup table (41) to provide a binary sequence of digits one at a time. Since the binary digits are selected so that their accumulation represents the amplitudes of a series of points on a theoretical sinusoidal wave, a low-pass filter (51) acting as an integrator is able to provide a sinusoidal wave signal. Furthermore, the low-pass filter includes gates that operate in push-pull fashion to form a balanced configuration for cancelling even ordered harmonic distortion. The modulator has a rate multiplier (11) responsive to space/mark signaling for controlling the rate that the binary digits are produced by the lookup table. A second group of binary digits is stored in the lookup table and is read out concurrently with the first sequence. Alternate pairs of gates (52 and 53 or 54 and 55) are enabled in the low-pass filter to provide binary data signals for either of the frequency bands used in duplex data signaling circuits.
355086
Kirby Eades Gale Baker
Western Electric Company Incorporated
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