One-bit frequency-shift-keyed modulator

Details One-bit frequency-shift-keyed modulator One-bit frequency-shift-keyed modulator

1979-07-11

1981-03-31

Moore, David K.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11R, 332 16R, 375 62, H04I 2712

Patent

active

042596483

ABSTRACT:
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 the 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.

REFERENCES:
patent: 3697892 (1972-10-01), Lawrence et al.
patent: 3773975 (1973-11-01), Koziol
patent: 3824498 (1974-07-01), McBride
patent: 4077021 (1978-02-01), Csajka et al.

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