Demodulating circuit, demodulating apparatus, demodulating metho

Details Demodulating circuit, demodulating apparatus, demodulating metho Demodulating circuit, demodulating apparatus, demodulating metho

1997-03-13

1998-09-29

Mis, David

Demodulators

Pulse or interrupted continuous wave demodulator

329361, 3408544, 375320, H03D 100, H04L 2706, G01V 300

Patent

active

058150358

ABSTRACT:
A demodulating method wherein the signal can be demodulated accurately even if the S/N ratio is lower by calculating an amplitude peak value by a specific formula from two values of an amplitude of an acoustic signal corresponding to a phase difference of 90 degrees at a carrier frequency transmitted by an acoustic signal transmitter, setting a threshold level preliminarily for the amplitude peak value, and demodulating the amplitude peak value by binarization on the basis of the threshold level, and a demodulating circuit and a demodulating apparatus used in the execution thereof. It is further possible to follow up automatically even when the acoustic characteristics change by automatically calculating the average of peak values of output of the vibration sensor in a state not transmitting the acoustic signal, automatically setting the signal level by a formula predetermined on the basis of the obtained average, and automatically calculating the threshold level from the average of the peak values and the signal level.

REFERENCES:
patent: 4857859 (1989-08-01), Asahi et al.
patent: 5448227 (1995-09-01), Orban et al.
patent: 5592438 (1997-01-01), Rorden et al.
patent: 5675325 (1997-10-01), Taniguchi et al.
Douglas S. Drumheller, "Acoustical properties of drill strings," The Journal of the Acoustical Society of America, vol. 85, No. 3, Mar. 1989, cover page, and pp. 1048-1064.

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