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4.1
OPERATIONAL OVERVIEW
small spaces within the room (will only be seen on a single microphone) while low-frequency resonances will be found
over a much larger area. This technique assures that no single-point room anomaly will dominate the measurement
unless, of course, it is severe enough to exist at many locations, as resonances tend to do. As you can see in Figure 8,
the dips tend to average out, while the peaks get reinforced. Exactly what we want to do.
Figure 6:
System Response in Five Locations.
Lower Trace is the Spatially Averaged Result, Prior to EQ
Data Post-Processing:
A Microphone Multiplexer (SMM-5) scans the microphones sequentially and forwards the data to the EVP. All analysis
computations are performed in the EVP. The data from the individual microphones is spatially averaged into a single
block of data. This is a reliable indicator of the average frequency response of the system throughout the listening area.
To this energy vs. time data a Fast Fourier Transform (FFT) algorithm is applied. This conversion yields the familiar
amplitude vs. frequency data.
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