Evoked response audiometer
Patent 4462411 Issued on July 31, 1984. Estimated Expiration Date: 
January 6, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 6, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3892227 3901215 Auditory response detection method and apparatus Patent #: 4275744 InventorAssigneeApplicationNo. 06/337397 filed on 01/06/1982US Classes:600/559, Ear or testing by auditory stimulus600/544Detecting brain electric signalExaminersPrimary: Howell, Kyle L.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesA61B 5/0476 (20060101)A61B 5/0484 (20060101) A61B 5/12 (20060101) Foreign Application Priority Data1981-01-07 AUAbstractAn evoked response audiometer is disclosed in which the patient is presented with a continuous auditory signal which is amplitude modulated and the evoked brain potentials of the patient (EEG) are recorded. The potentials are amplified and filtered and are averaged over a number of sampling periods to improve the signal to the noise ratio. The averaged signals are then analyzed to determine the amplitude and phase of the main components of the response to determine whether phase locking has occurred. The phase of the main components is then plotted against variation of the modulating frequency and the gradient of the plot provides the latency of the response from which neurological and other factors of significance to the hearing of the patient may be determined. The sound pressure level of the auditory signal is also varied and the amplitude and phase of the response plotted against these changes to provide an indication of the sensitivity of the hearing of the patient.Other References
| |
