Communications – electrical: acoustic wave systems and devices – Borehole testing
Patent
1981-05-11
1983-04-26
Kemeny, Emanuel S.
Communications, electrical: acoustic wave systems and devices
Borehole testing
367134, G10L 100
Patent
active
043814280
ABSTRACT:
An apparatus and technique reduces the data transmission rate required to ansmit acoustic signals from undersea sensors to remote monitoring locations without degrading the surveillance information content of the signals. The signals are digitized and fed to an adaptive line enhancer (Wiener filter) which processes them so that a fast Fourier transform (Karhunen-Loeve approximation) coefficient generator can feed representative signals to a programmable quantizer and a signal averager. When significant shifts are detected in the fast Fourier transform coefficient variances, responsive signals are generated by the programmable quantizer for adaptive bit allocation. An interconnected multiplexer transmits multiplexed signals to the remote monitoring station where the inverse of the foregoing allows an analysis of the acoustic signals being monitored.
REFERENCES:
patent: 4066842 (1978-01-01), Allen
patent: 4133976 (1979-01-01), Atal et al.
patent: 4142071 (1979-02-01), Croisier et al.
Widrow, "Adaptive Noise Cancelling", Proc. IEEE, Dec. 1975, pp. 1692-1716.
Kolesar Robert R.
Rickard John T.
Zeidler James R.
Beers Robert F.
Johnston Ervin F.
Kemeny Emanuel S.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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