![]() The decibel, commonly abbreviated as dB, is a unit used to quantify the intensity or level of sound. Have you ever wondered how sound is measured? Well, that’s where the decibel comes in. Understand their definitions, measurements, and practical applications in different fields. ![]() For special handling or overnight shipping, please call us at 28.Discover the various units for sound measurement, such as decibel, hertz, sound pressure level, watt, phon, octave, and sound intensity level. In-stock items are normally shipped within 24-48 hours on business days. Shipping Cost: US Shipping included! Int'l Shipping calculated at checkout Therefore, the T-coil receiver serves essentially the same purpose as the microphone. T-coils can be thought of as mini-antennas, which receive magnetic information. The T-coil detects and converts magnetic energy into electrical energy in much the same way that a microphone converts acoustic energy into electrical energy. T-coil receiver within a hearing aid is a tiny piece of metal wrapped tightly with coils of copper. The commonly used "zero" reference sound pressure in air is 20 µPa RMS, which is usually considered the threshold of human hearing at 1 kHz. It is measured in decibels (dB) above a standard reference level. Sound Pressure Level (SPL) is a logarithmic measure of the effective sound pressure (loudness) of a sound relative to a reference value. 90dB is a very loud sound and is frequently used as an input to test the limit of a hearing aid. "HF Average SSPL 90" would refer to the average level of high frequencies (HFA) with a 90dB input. 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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