Page 150 - The Master Handbook Of Acoustics
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ANALOG AND DIGITAL SIGNAL PROCESSING
Digitization
A digital filter contains no such physical components as inductors and
capacitors. It is basically a computer program that operates on a sample
of the signal. This process is described in Fig. 6-7. The incoming analog
signal is represented in Fig. 6-7A. Through a multiplication or modula-
tion process, the analog signal of Fig. 6-7A is combined with the sam-
A
B
C
D
FIGURE 6-7
(A) the analog signal, (B) digitizing pulses, (C) the digitized analog signal resulting
from the modulation of (A) with (B). Application of a sample-and-hold circuit to (D)
which completes the quantization process reducing the analog samples to discrete val-
ues suitable for storage in memory.
