Adaptive phase shift adjuster for resonator

Details Adaptive phase shift adjuster for resonator Adaptive phase shift adjuster for resonator

1996-07-15

1998-06-09

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375332, 329304, 329367, H04L 2722

Patent

active

057647054

ABSTRACT:
The in-phase channel 28 of a complex demodulated resonator data output signal 12 should contain all of the sensed information, and the quadrature-phase channel 32 should contain none of it. This will not happen if the phase of the reference signal 14 is incorrect. The phase may be adjusted by first filtering each demodulated channel with a respective low-pass dc-blocked filter 34, 38 which passes only the frequencies of the sensed information. If the sensed information gets through on both channels, then there will be a non-zero cross-correlation between the channels. This cross-correlation can be servoed to a minimum by use of a feedback signal 22. Doing so will cause all of the sensed information to be in one channel 28, and diagnostic information to be in the other channel 32.

REFERENCES:
patent: 4893316 (1990-01-01), Janc et al.
patent: 5089822 (1992-02-01), Abaunza et al.
patent: 5369500 (1994-11-01), Jacobs
patent: 5487015 (1996-01-01), White
patent: 5550866 (1996-08-01), White
patent: 5559828 (1996-09-01), Armstrong et al.
patent: 5577073 (1996-11-01), White
patent: 5638399 (1997-06-01), Schuchman et al.

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