Feedback
Fitting software
FM listening systems
Frequency

Feedback
Feedback is the loud, unpleasant, high-pitched whistling which can sometimes be heard from the hearing aids. It occurs when the amplified sound re-enters the hearing aid and is re-amplified.

Fitting software
All digital and digitally programmable analogue instruments are adjusted via a computer. For this purpose we develop special fitting software that the audiologist must use in order to get the optimal adjustment of a hearing aid to match the individual user's needs.

FM listening systems
FM listening systems work by picking up the sound of a speaker’s voice through a microphone and transmitting it as a radio signal directly to the person wearing the hearing aid. FM systems work very well when there is a lot of noise present or distance between the speaker and the listener, situations which typically make speech understanding very difficult for a hearing-impaired person.

Frequency
The number of times a repetitive event occurs in a specified time period is a frequency. For the sinusoid waves shown it is the number of periods occurring in one second. This is expressed in cycles per second or Hertz (Hz). A common word for frequency is pitch.