Apparatus for demodulating differential phase shift keyed signal

Details Apparatus for demodulating differential phase shift keyed signal Apparatus for demodulating differential phase shift keyed signal

1985-06-25

1987-01-06

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329122, 375 84, H03D 300

Patent

active

046349901

ABSTRACT:
A demodulating apparatus receives a differential phase shift keyed analog signal which is coupled to the input of a voltage controlled oscillator. The voltage controlled oscillator generates a plurality of pulses at a frequency which is proportional to the amplitude of the analog signal. The pulses are counted during in-phase intervals and intervals which are quadrature phase related to the in-phase intervals. The signs of the differences between (i) the number of in-phase and quadrature phase interval pulses counted during a first bit rate interval and (ii) a reference pulse count number, are determined. The signs of the differences between (i) the in-phase and quadrature phase pulses counted during a second bit rate interval, which follows the first bit rate interval, and (ii) the reference count number, are also determined. A phase change is indicated when the signs of the second in-phase and quadrature phase differences are different from the signs of the first in-phase and quadrature phase differences respectively.

REFERENCES:
patent: 4311964 (1982-01-01), Boykin

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