COMPRESSION SYSTEMS IN HEARING AIDS

6.1 COMPRESSION’S MAJOR ROLE: REDUCING THE SIGNAL’S DYNAMIC RANGE

6.2 BASIC CHARACTERISTICS OF A COMPRESSOR

6.2.1 Dynamic compression characteristics: attack and release times
6.2.2 Static compression characteristics
6.2.3 Input and output control
6.2.4 Multichannel compression

6.3 RATIONALES FOR USE OF COMPRESSION

6.3.1 Avoiding discomfort, distortion and damage
6.3.2 Reducing inter-syllabic intensity differences
6.3.3 Reducing differences in long term level
6.3.4 Increasing sound comfort
6.3.5 Normalizing loudness
6.3.6 Maximizing intelligibility
6.3.7 Reducing noise
6.3.8 Empirical approaches

6.4 COMBINATIONS OF COMPRESSORS IN HEARING AIDS

6.5 BENEFITS AND DISADVANTAGES OF DIFFERENT COMPRESSION SYSTEMS

6.5.1 Compression relative to linear
6.5.2 The benefits of multichannel relative to single-channel compression
6.5.3 Slow versus fast compression

6.6 CONCLUDING COMMENTS