Tapped Delay Lines

A tapped delay line is a delay line which provides access to its contents at multiple arbitrary intermediate delay length values.
The block diagram of Fig. 17 illustrates a delay line of total length $M_{2}$ samples and a tap located at a delay of $M_{1}$ samples. In general, a tap delay line is implemented as a single delay line with multiple, variable output locations.

Figure 17: A tap delay line of total length $M_{2}$ and a tap at $M_{1}$ .
$\begin{figure}\begin{center} \begin{picture}(3.5,1.0) \put(0.28,0){\epsfig{fil... ....16){$b_{M_1}$} \put (3.5,0.5){$y[n]$} \end{picture} \end{center} \end{figure}$
Tap delay lines can be interpolating or non-interpolating.
Tap delay lines can efficiently model multiple echoes from the same sound source and are useful in artificial reverberation.