A rough guide to the average delay-line length is the ``mean free
path'' in the desired reverberant environment. The *mean free
path* is defined as the average distance a ray of sound travels before
it encounters an obstacle and reflects. An approximate value for the
mean free path, due to Sabine, an early pioneer of statistical room
acoustics, is

where is the total volume of the room, and is total surface area enclosing the room. This approximation requires the

where denotes sound speed and denotes the sampling period. This number should be treated as a lower bound because in real rooms reflections are often

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Center for Computer Research in Music and Acoustics (CCRMA), Stanford University