Page 145 - Master Handbook of Acoustics

FIGURE 6-10 Typical equipment configuration used by investigators to study the audible effect of a
simulated lateral reflection on the direct signal. Reflection level and delay (with respect to the direct
sound) are the variables under control.

Olive and Toole investigated listening conditions in small rooms, such as recording studio control
rooms and home listening rooms. In one experiment, they investigated the effect of simulated lateral

reflections in an anechoic environment with speech as the test signal. The work is summarized in Fig.
6-11. This graph plots reflection level against reflection delay, the two variables specified above. A
reflection level of 0 dB means that the reflection is the same level as the direct signal. A reflection
level of −10 dB means that the reflection level is 10 dB below the direct. In all cases, reflection
delay is in milliseconds later than the direct signal.