Assistive Listening Devices
Sometimes hearing aids are not the only solution so we offer a variety of devices to help in specific situations.
An Assistive listening device (ALD) is used to improve hearing ability for people in a variety of situations where they are unable to distinguish speech in noise. Often in a noisy or crowded room it is almost impossible for an individual who is hard of hearing to distinguish one voice among many. The hard of hearing listener has to distinguish between background noise, noise between them and the speaker and then there will be the effect of room acoustics on the quality of sound reaching their ears. Hearing aids are able to amplify and process these sounds and improve the speech to noise ratio but if the sound is too distorted by the time it reaches the listener even the best hearing aids will struggle to unscramble the signal.
A common usage is to aid people who are hard of hearing (HOH). by amplification and better sound to noise ratio (SNR). The ALD may be used to help HOH people hear televisions and other audio devices and also to help people hear speech through public address (PA) systems such as in synagogue or at a lecture.
- The use of a wireless microphone placed next to the speaker helps to reduce the effects of reverberation from poor room acoustics
- Eliminates the background noise by the listener, and by using a directional microphone reduces the background noise
- Usually uses a microphone to capture an audio source near to its origin
- The signal is broadcast wirelessly over FM frequency
- Listener uses a receiver to pick up signal and hear at preferred volume
- Other devices such as alarm clocks with bed shakers, amplified stethoscopes, baby monitors and flashing door bell indicators