as a membrane, a string, or the air in an enclosure. If propagation in these media

is ideal, i.e., free of losses, dispersion, and nonlinearities, it can be simulated by

delay lines.

continuous time, the frequency response of such system is

is linear with slope .

ments the transfer function

multiple of the sampling quantum, m is an integer number and it is straight-

forward to implement the system (2) by means of a memory buffer. In fact, an

m-samples delay line can be implemented by means of a circular buffer, that is

a set of M contiguous memory cells accessed by a write pointer IN and a read

pointer OUT, such that

instant, the input is written in the location pointed by IN, the output is taken

from the location pointed by OUT, and the two pointers are updated with