Demodulation reference signal source

Details Demodulation reference signal source Demodulation reference signal source

1990-06-18

1992-09-15

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051482363

ABSTRACT:
An information retrieval system for extracting information from a pair of substantially coherent electromagnetic waves represented by phase differences therebetween each of which is incident on a photodetector, and having a demodulator which receives the photodetector output signal and which also receives a reference signal. The reference signal is obtained through use of a phase shift detector which receives the photodetector signal to determine certain phase shifts occurring therein and provides this information to a reference signal supply to adjust the phase of its output signal which then serves as the reference signal for the demodulator.

REFERENCES:
patent: 4728192 (1988-03-01), Shaw et al.
patent: 4883358 (1989-11-01), Okada
patent: 5018859 (1991-05-01), Chang et al.

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