Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 130

The critical distance r_c (or sometimes called the reverberation radius) is defined as the distance from the sound source where the direct field and reverberant field contributions to p²_rms are equal:

(3.79)

thus,

(3.80)

Figure 3.23 gives a plot of Eq. (3.78) (the so‐called room equation).

Figure 3.23 Sound pressure level in a room (relative to sound power level) as a function of distance r from sound source.