Digital Signal Processing Reference
In-Depth Information
FIGURE 10.62.
Frequency response of the three
3
-octave filters of band 9.
FIGURE 10.63.
Signal reception with two microphones.
10.23.2 Acoustic Direction Tracker
This project uses two microphones to capture an audio signal. From the delay asso-
ciated with the signal reaching one of the microphones before the other, a relative
angle where the source is located can be determined. A signal radiated at a distance
from its source can be considered to have a plane wavefront, as shown in Figure
10.63. This allows the use of equally spaced sensors (many microphones can be used
as acoustical sensors) in a line to ascertain the angle at which the signal is radiat-
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