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CHAPTER 6
SIM MEASUREMENT SYSTEM
SIM is a measurement and instrumentation system includ-
ing a selection of hardware and software options, micro-
phones and accessory cables. The SIM audio analyzer is
optimized for making audio frequency measurements of
an acoustical system with a resolution of up to 1/24 of an
octave; the high resolution enables you to apply precise
electronic corrections to adjust system response using
frequency and phase (time) domain information.
Source Independent Measurement Technique
The SIM audio analyzer implements the Meyer Sound
source independent measurement technique, a dual-chan-
nel method that accommodates statistically unpredictable
excitation signals. Any excitation signal that encompasses
the frequency range of interest (even intermittently) may be
used to obtain highly accurate measurements of acoustical
or electronic systems. For example, concert halls and loud-
speaker systems may be characterized during a musical
performance using the program as the test signal, allowing
you to:
■ 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 frequen-
cy axis
■ Determine and internally compensate for propagation
delays using SIM Delay Finder function
Applications
The main application of SIM is loudspeaker system testing
and alignment. This includes:
■ Measuring propagation delay between the subsystems
to set correct polarities and set very precise delay times
■ Measuring variations in frequency response caused by
the acoustical environment and the placement and in-
teraction of the loudspeakers to set corrective equaliza-
tion
■ Optimizing subwoofer integration
■ Optimizing loudspeaker arrays
SIM can also be used in the following applications:
■ Microphone calibration and equalization
■ Architectural acoustics
■ Transducer evaluation and correction
■ Echo detection and analysis
■ Vibration analysis
■ Underwater acoustics