Method and apparatus for digital modulation using concurrent pul

Details Method and apparatus for digital modulation using concurrent pul Method and apparatus for digital modulation using concurrent pul

1992-10-13

1994-02-22

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

Including logic element

331 23, 332127, 375 45, 375 65, 455 76, 455110, H03C 309, H03L 706, H04L 2712

Patent

active

052891410

ABSTRACT:
A method and apparatus for generating an output signal (616) having a pre-determined frequency shift relative to the frequency of a reference signal from a reference frequency generator (202) comprise a digital phase-locked loop (206) coupled to the reference signal for generating the output signal (616). The method and apparatus further comprise adding pulses to the reference signal in a pulse addition circuit (304), the pulses recurring at a first cyclical rate determined by a microprocessor (702). The method and apparatus further comprise concurrently subtracting pulses from the reference signal in a pulse subtraction circuit (302) at a second cyclical rate.

REFERENCES:
patent: 4471328 (1984-09-01), Chapman
patent: 4901036 (1990-02-01), Herold et al.
patent: 4926141 (1990-05-01), Herold et al.

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