Audio Engineering

Acoustic Environment 111

Source

1

2 2

22

3

3

3

3

3

3

1 Direct field

2 Early field

3 Reverberant field

Figure 3.16 : Comparison of direct, early, and reverberant sound fi elds in an auditorium
(refl ection adjusted for purposes of illustration).

(c) Small room without reverberant sound field

showing decay side of room modes

6 dB

Horizontal : 20.35–9869.43 Hz

7400 Hz 6058 Hz

T 1

T 2

(d) Large room with reverberant sound field

6 dB

Horizontal : 0.00–1918.86 Hz

Figure 3.15 : (Continued).