DIRECTIONAL MICROPHONES AND ARRAYS

7.1 DIRECTIONAL TECHNOLOGY

7.1.1 First-order subtractive directional microphones
7.1.2 Additive directional arrays
7.1.3 Complex directional arrays
7.1.4 Bilateral directivity

7.2 QUANTIFYING DIRECTIVITY

7.2.1 2D and 3D directivity index
7.2.2 AI-DI

7.3 DIRECTIONAL BENEFIT

7.3.1 Impact of listening environment
7.3.2 Objective benefit in the clinic and self-reported benefit in real life
7.3.3 Interaction with other technologies
7.3.4 Disadvantages of directivity
7.3.5 Candidates for directional microphones
7.3.6 Evaluation of directional microphones in the clinic

7.4 CONCLUDING COMMENTS