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Portable audiometer Tetra-Tone Model EB-46Purposeevaluate hearing acuityAn audiometer is a machine used for evaluating hearing acuity. They usually consist of an embedded hardware unit connected to a pair of and a test subject feedback button, sometimes controlled by a standard PC.
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Such systems can also be used with bone vibrators, to test conductive hearing mechanisms.Audiometers are standard equipment at clinics and in centers.An alternative to hardware audiometers are software audiometers, which are available in many different configurations.Screening PC-based audiometers use a standard computer.Clinical PC-based audiometers are generally more expensive than software audiometers, but are much more accurate and efficient. They are most commonly used in hospitals, audiology centers and research communities. These audiometers are also used to conduct industrial audiometric testing. Some audiometers even provide a software developer's kit that provides researchers with the capability to create their own diagnostic tests. Portable audiometer Maico, circa 1960sAn audiometer typically transmits recorded sounds such as pure tones or speech to the headphones of the test subjectat varying frequencies and intensities, and records the subject's responses to produce an of threshold sensitivity, or speech understanding profile.Types Medical grade audiometers are usually an embedded hardware unit controlled from a PC. Software audiometers which run on a PC are also commercially available, but their accuracy and utility for evaluating hearing loss is questionable due to lack of a calibration standard.The most common type of audiometer generates pure tones, or transmits parts of speech.Another kind of audiometer is the Bekesy audiometer, in which the subject follows a tone of increasing and decreasing amplitude as the tone is swept through the frequency range by depressing a button when the tone is heard and releasing it when it cannot be heard, crossing back and forth over the threshold of hearing.
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Bekesy audiometry typically yields lower thresholds and standard deviations than pure tone audiometry.Standards Audiometer requirements and the test procedure are specified in 60645, 8253, and isoS3.6 standards.See also.References.