Surgery – Truss – Perineal
Patent
1977-07-13
1979-01-02
Michell, Robert W.
Surgery
Truss
Perineal
128 21B, 360 7, 346 33ME, A61B 504
Patent
active
041322266
ABSTRACT:
The broadband auditory thresholds of marine mammals are determined by an apparatus which compensates for the animals' movement artifact. A number of evoked responses to audio stimuli are average during discrete time intervals. This approach reduces the effects of potentials attributed to movements of the animal, for example, the opening and closing of the blow hole. A threshold detector circuit, a tape delay and related circuitry electronically cooperate to block potentials attributed to the movement artifact when the potentials exceed the likely magnitude of the evoked response. Optionally, an oscilloscope is used to provide a visual representation of the evoked response and the potentials are manually inhibited when the movement artifact masks or otherwise overrides the evoked response.
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Debecker, J. et al., "Automatic Suppression of Eye Movement and Muscle Aracts When Averaging Tape Recoded Cerebral Evoked Potentials", EEG and Clin Neurophys.
Roby, R. E. et al., "A Simplified Circuit for Stimulus Artifact Supression," Hrnl. of EEG and Clin. Neurophys. vol. 39 No. 1 pp. 85-87, Jul. 1975.
Flanigan William F.
Seeley Robert L.
Jaworski Francis J.
Johnston Ervin F.
Keough Thomas Glenn
Michell Robert W.
Sciascia Richard S.
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