CHAPTER 6: SYSTEM DESIGN AND INTEGRATION TOOLS
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SIM 3 MEASUREMENT SYSTEM
The SIM 3 audio analyzer is a high-resolution audio measure-
ment system comprised of software, hardware, microphones,
and accessory cables. SIM 3 is optimized for measuring
audio frequencies with resolutions down to 1/48th of an
octave, allowing you to apply precise corrections to balance
system response using frequency and phase domain infor-
mation.
Source Independent Measurement Technique
The SIM 3 audio analyzer implements Meyer Sound’s source
independent measurement technique, a dual-channel
method that accommodates statistically unpredictable exci-
tation signals. Any excitation signal within a desired frequency
range can be used to obtain highly accurate measurements
for acoustical or electronic systems.
For example, during a performance, both the input signal and
the measured output of the loudspeaker system can be cap-
tured and used as a SIM 3 test signal, so you can:
■ View measurement data as amplitude versus time
(impulse response) or amplitude and phase versus fre-
quency (frequency response)
■ Utilize a single-channel spectrum mode
■ View frequency domain data with a logarithmic frequency
axis
■ Determine and internally compensate for propagation
delays using the SIM 3 Delay Finder
SIM 3 Applications
SIM 3’s main applications are testing and aligning loud-
speaker systems, which entails:
■ Measuring propagation delays between subsystems to
determine appropriate polarities and delay times
■ Measuring variations in frequency response caused by the
acoustical environment and the placement and interaction
of loudspeakers to determine corrective equalization
■ Optimizing subwoofer integrations
■ Optimizing loudspeaker arrays
SIM 3 can also be used in the following applications:
■ Microphone calibration and equalization
■ Transducer evaluation and correction
■ Echo detection and analysis
■ Vibration analysis
■ Architectural acoustics
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