1. Hearing Aids

• Digital Programmable Hearing Aids
• Analog Programmable Hearing Aids
• Conventional Analog Hearing Aids

2. Assistive Listening Devices

• • FM System
  • Amplified Telephone
  • TTY

Digital Programmable Hearing Aids

The most common used hearing aids have all the features of analog programmable aids but use digitized sound processing (DSP) to convert sound waves into digital signals. A computer chip analyzes the signals to determine whether the sound is noise or speech. Modifications are the made to provide a clear, amplified, distortion-free signal.