INTRODUCTORY CONCEPTS

1.1 PROBLEMS FACED BY PEOPLE WITH HEARING IMPAIRMENT

1.1.1 Decreased audibility

1.1.2 Decreased dynamic range

1.1.3 Decreased frequency resolution

1.1.4 Decreased temporal resolution

1.1.5 Physiological origins of hearing loss
1.1.6 Deficits in combination

1.2 ACOUSTIC MEASUREMENTS

1.2.1 Basic physical measures.

1.2.2 Linear amplifiers and gain.

1.2.3 Saturation Sound Pressure Level.
1.2.4 Couplers and real ears.

1.3 TYPES OF HEARING AIDS

 

1.4 HISTORICAL PERSPECTIVE

1.4.1 The acoustic era

1.4.2 The carbon era

1.4.3 The vacuum tube era

1.4.4 The transistor and integrated circuit era

1.4.5 The digital era
1.4.5 The wireless era