![]() ![]() For example, "SSPL90: <135dB" means that for a input of 90dB sound into the hearing aid, less than 135dB sound will come out. Saturation Sound Pressure Level (SSPL) a measure of the maximum output of a hearing aid. Reference Test Gain is the amount of gain with a 50dB input sound and the volume control at normal level. 90dB sound is very loud, equivalent to sound generated by a lawnmower or screaming child. ![]() Output Sound Pressure Level 90 (OSPL90) is the output saturation sound level (SSPL) to a 90dB sound input and is measured over a frequency range. The induction coil prevents whistling (feedback) and stops outside noise from interfering with the sound from the telephone. Induction Coil Sensitivity is how well the induction coil or telephone works. An audiometer is used to obtain this measurement, which is always described in decibels (dB HL). Hearing Level is a measurement of how well a person hears. Total harmonic distortion is a measure of the total harmonics generated for some standard reference input. Harmonic Distortion occurs when new frequencies are generated that are harmonics of the original signal. Normal conversation is at the 50dB level. For example "HF Average Full-on Gain/Input 50dB SPL" refers to the average gain at high frequency for a 50dB input when the volume control is at its maximum. This should closely match your audiogram and is probably the single most important parameter.įull On Gain (FOG) is the gain when the volume control is set to maximum. For a hearing aid, it should be below 30dB.įrequency Response shows the gain or amplification of the hearing aid at various frequencies. It is a measure of how much noise a device will add to the input signal. For example, AGC can effectively reduces the output when the input signal is strong and raises the output signal when the input is weak.īattery Current Drain is an indication on how long a battery would last in the device even if it is in storage.Įquivalent Input Noise Level is a rating of the overall noise performance of the hearing aid. Audiogram is a graphic record of hearing ability for various sound frequencies that is used to measure hearing loss.Īutomatic Gain Control (AGC) is a feedback system capable of adjusting the gain to an appropriate level for a wide range of input levels. ![]()
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