Otometry Instruments

Additional Historical Information Related to Fitting Hearing Aids Using Otometry Test Equipment Otometry was based on sound pressure measurements and a damped wavetrain signal (DWT).  Because of this, instruments had to be devised to make these measurements.  An instrument was required to generate and deliver the damped wavetrain signals at the sound pressures required for different…

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What Is Unity Gain in Hearing Aids?

A hearing professional who regularly reads this Internet site recently wrote: “I hear others talking about ‘unity gain’ when describing hearing aid amplification.  What is unity gain and how is it implemented in hearing aids?”  In order to answer this question, it is first necessary to review amplification, in general. Amplification “Unity acoustic gain,” or…

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