HEARING AID SYSTEMS

3.1 CUSTOM AND MODULAR CONSTRUCTION

3.1.1 Custom hearing aids

3.1.2 Modular hearing aids

3.1.3 Semi-modular, semi-custom hearing aids
3.1.4 Hearing aid reliability

3.2 LINKED BILATERAL HEARING AIDS

 

3.3 PROGRAMMING THE HEARING AID

3.3.1 Programmers, interfaces, and software

3.3.2 Multi-memory programmable hearing aids

3.3.3 Paired comparisons

3.4 REMOTE SENSING AND TRANSMITTING HEARING AID SYSTEMS

3.5 INDUCTION LOOPS

3.5.1 Field uniformity and direction

3.5.2 Magnetic field strength

3.5.3 Loop frequency response

3.6 RADIO-FREQUENCY TRANSMISSION

3.6.1 Frequency modulation

3.6.2 Digital modulation techniques

3.6.3 Coupling to the hearing aid
3.6.4 Combining wireless and local microphones

3.7 INFRARED TRANSMISSION

3.8 CLASSROOM SOUND FIELD AMPLIFICATION


3.9 COMPARATIVE STRENGTHS AND WEAKNESSES OF MAGNETIC LOOPS, RADIO-FREQUENCY (FM), INFRA-RED, AND SOUND FIELD AMPLIFICATION SYSTEMS


3.10 ASSISTIVE LISTENING DEVICES

3.11 CONNECTIVITY AND CONVERGENCE

3.11.1 Connecting electronic devices to hearing aids
3.11.2 Convergence
3.11.3 Interference between mobile phones and hearing aids

 

3.11 CONCLUDING COMMENTS