Hearing aid composition–Hearing aid common term explanation[Daquan]
Input: The sound that enters the hearing aid before the sound is not amplified, that is, the sound size of the microphone. We can call it the initial sound.
Output: The size of the sound that is transmitted from the receiver after the change of the hearing aid amplifier. We can call it the amplified sound, which is changed.
Gain: refers to the size of the change during the input and output process.
Zoom in type
Linear magnification: refers to a magnification that is proportional to loud and small sounds.
Nonlinear amplification: Its principle is to smother and enlarge more, louder and less.
Compression ratio: is the ratio of input changes to output changes.
Inflection point: The input intensity that causes the compression ratio to change is the inflection point.
BET: behind the ear hearing aid
ITE: All-ear cavity-type hearing aid
ITC:Half ear cavity hearing aid
CIC: Deep ear canal hearing aid
MPO: Maximum sound output limit for hearing aids
AC: air conduction hearing
BC: bone conduction hearing
UCL: Uncomfortable threshold
Manual program: The sound is switched by the manual program button on the hearing aid.
Automatic program: It is a hearing aid with automatic recognition of the ambient sound. When passing through a specific environment area, the hearing aid recognizes the surrounding environment, and then judges whether it is quiet or noisy, whether it is music or speech, and then automatically changes without manual.
Bluetooth: Usually it is matched with the phone to complete the work of Bluetooth phone or Bluetooth music.
FM: When the ambient signal-to-noise ratio is low, the hearing aid wearer can easily hear it. The speaker needs to wear the transmitter, and the hearing aid increases the receiver to complete the long-distance signal transmission.
Noise Reduction: A hearing aid that processes a particular direction or a specific type of sound.
Frequency band: It is the highest number that can be refined when the hearing aid fitter is debugging. It is very important for the fitting. It can increase or decrease the sound of a detailed frequency more finely, without hurting other frequencies that are better. .
Hardware parameter class
Saturated sound pressure level: the maximum output sound pressure level that the hearing aid can achieve.
Full Gain: The gain level that can be achieved.
Frequency response range: A numerical representation of the frequency response curve indicating that the hearing aid is operating within this frequency range.
Rated power supply current consumption: is the power consumption of the hearing aid.
Local noise: Generally, the equivalent input noise level is reflected in the detection, that is, the noise level of the hearing aid is not input, and the international standard cannot exceed32dB SPL.
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