Personal hearing evaluator

Abstract

A hand-held device includes an audio transducer (i.e., speaker) for delivering acoustic test stimuli to a test subject within the direct sound field range of the device. The device accurately delivers multi-level and multi-frequency test stimuli for the subjective response by the test subject holding the device. An ultrasonic position sensor within the device determines the position of the device with respect to the head or a portion of interest of the head of the test subject while the device is being held. The acoustic test stimuli are controlled and regulated based on the position of the device with respect to the test subject so that accurate levels of test stimuli are presented only when the device is within a proper range and irrespective of its exact position with respect to the test subject's head.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 09 / 400,151 (Attorney Docket No. 022176-000700US), filed on Sep. 21, 1999, the full disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] A. Technical Field [0003] The present invention relates generally to air-conduction hearing evaluation, and more particularly, to portable hand-held hearing testing and hearing aid fitting. [0004] B. Description of the Prior Art [0005] Air-conduction hearing evaluation involves the presentation of airborne sounds (test stimuli) to the ears of a test subject. The evaluation may involve threshold measurements whereby the threshold of hearing is determined at various frequencies, or suprathreshold measurements whereby loudness perceptions above threshold are determined. Suprathreshold testing include most comfortable loudness (MCL), uncomfortable loudness (UCL) and dynamic range measurements. A var...

AI Technical Summary

Benefits of technology

[0025] In a preferred embodiment, the invention comprises an ultrasonic position sensor for measuring the position of the device with respect to the head of the test subject holding the hand held device. The distance is computed by measuring the latent period between the transmitted ultrasonic signal and the measured ultrasonic response reflected by the head or the ear. The acoustic test stimuli produced by the speaker are controlled and regulated based on the position of the device with respect to the test individual. Thus, the accurate levels of test stimuli are presented only upon the proper positioning of the device and irrespective of the exact position of the device. This eliminates position and movement-related errors commonly experienced in conventional sound field audiometry. Furthermore, the test subject or a test operator is automatically alerted whenever the device is incorrectly positioned during a test.

[0029] The device may be designed and configured for dual mode configurations by first being connected to an auxiliary instrument for performing relatively complex aided and unaided audiometric evaluation in the presence of a hearing professional, and subsequently as a personal evaluator for simple verification of hearing acuity and hearing aid function.

Problems solved by technology

Sound field evaluation generally involves bulky instrumentation, complex calibration procedures and require specialized test rooms.

The use of anechoic test rooms to eliminate reverberant sounds is extremely expensive and thus not employed in standard audiological test setups.

However, maintaining a precise seating arrangement within 70 cm of a speaker presents many challenges related to subject movement, discomfort, and even claustrophobia.

Furthermore, the use of microphone probe tube systems adds considerable cost and complexity for the evaluation procedure, not to mention the inconvenience of attaching and maintaining a probe tube and its cabling for both the subject and the clinician.

Headphone and insert earphones can be uncomfortable and cumbersome for many individuals.

Furthermore, headphone and insert earphones are particularly problematic for aided evaluation (with a hearing aid placed in the ear) because they generally interfere, physically and acoustically, with the proper function of a worn hearing device.

Other problems associated with headphones and insert earphones include inaccuracies due to individual ear size variability and cabling interference and damage.

However, due to the relatively large errors associated with outside room acoustics, calibration, speaker-subject positioning and ambient background noise, portable and hand-held instruments tend to be limited to basic screening evaluation, requiring follow up testing in a proper audiological setup.

Since the testing is performed while the tip of the otoscope is inserted in the ear canal, it is obviously not intended for aided evaluation whereby a hearing aid is worn in the ear canal.

Furthermore, an otoscope is intended for use by a professional thus not suitable as a personal hearing evaluator.

As previously observed, headphone type audiometry not only interferes with the proper function of most hearing aids when worn, but is also bulky and uncomfortable for many users.

Chojar's device is limited to producing a single tone at single level, thus clearly not suitable for performing audiometric measurements.

Although designed to produce multi-level acoustic stimuli, the device is essentially a screening device for infants, thus not concerned with presenting accurate stimulus levels at multiple frequencies, nor concerned with aided evaluation.

Furthermore, the device is clearly not designed for self-testing.

However, the direct contact of the device to the ear area is not only awkward for audiometric testing, but is also difficult to operate by an individual of limited dexterity in self-testing scenarios.

Furthermore, testing involving both ears simultaneously (binaural mode) is not possible with such a device.

This is important since hearing aids are notorious for being subject to frequent damage and deterioration.

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