Method and apparatus for generating and detecting amplitude and

Details Method and apparatus for generating and detecting amplitude and Method and apparatus for generating and detecting amplitude and

1995-08-09

1997-01-14

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324 7655, G01V 330, G01V 318, G01R 1302

Patent

active

055943446

ABSTRACT:
A method of extracting a phase and amplitude modulation signal impressed on a carrier is disclosed. The method includes generating the carrier at a frequency which is a multiple of the bandwidth of the modulation signal. The multiple equals 4N+1, where N is an integer. The modulation signal is impressed on the carrier, generating a phase and amplitude modulated carrier, The modulated carrier is digitally sampled at a frequency of four times the bandwidth the modulation signal. The digital sampling is initiated substantially contemporaneous with initiation of generating the carrier. A 90-degree phase shift is applied to the digitally sampled carrier to generate a quadrature component of the digitally sampled carrier. A time delay is applied to the digitally sampled carrier to restore time coincidence between the quadrature component and said digitally sampled carrier, and the phase and amplitude modulation signal is extracted by commutation of the time-delayed digitally sampled carrier and the quadrature component of the digitally sampled carrier. In a particular embodiment of the invention, the phase and amplitude can be extracted from the extracted signal.

REFERENCES:
patent: 5548219 (1996-08-01), Sinclair

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