Standard and Non Standard Tests
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| SSPL | Frequency response at full volume with an input of 90dB
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| OSPL90 | Output SPL with input of 90dB at full volume
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| Maximum Gain | Gain of hearing aid measured at full volume with an input of 50dB
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| Gain at Reference Test Frequency | Maximum gain measured at the reference test frequency
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| Reference Test Gain | Gain measured at a simulated user setting with an input of 60dB
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| Harmonic Distortion | Total harmonic Distortion measured at the reference test gain at a variety of frequencies
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| Input Noise | Internal noise of the hearing aid with no input signal
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| Battery Current | Amount of current used by the battery as measured with the battery pill
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| Induction Coil Sensitivity | Signal strength of the induction coil at full volume with the hearing aid moved to achieve maximum response
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| AGC Knee Point | Measured using an input output function (point at which compression ratio/gradient changes
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| AGC Attack and Release Times | Time taken for compression to be start and stop where a loud sound is applied
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| Frequency Response | Gain – frequency response at the reference test gain
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| Input - Output Curves | Measured at one frequency with different input levels, output levels are measured and plotted to measure gain at each level
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| Non - Standard test using composite signals (2) | Gain frequency response curve at any input level
Output frequency response curve at any input level
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| Non - Standard test using pure tones (4) | Distortion frequency curves
Input output curves
Gain frequency response curve at any input level
Output frequency response curve at any input level
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