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System Overview
A typical headphone test system consists of
the SoundCheck Basic Software with optional HarmonicTrak.
distortion test module, computer, sound card, audio amplifier,
artificial ear (B&K Type 4153) or test head (B&K
Type 4128C HATS with additional right artificial ear), and
microphone power supply for each ear (options may vary depending
upon application).
Production Testing
Simultaneously measuring acoustical and electrical
parameters, SoundCheck determines ALL quality-related parameters
including frequency response, distortion, rub and buzz,
polarity, impedance and sensitivity in one test. A unique
stepped sine excitation signal (Stweep.) allows test times
to be 3 seconds or less without sacrificing test accuracy.Listen's
proprietaryHarmonicTrak. algorithm rejects background noise
while measuring the fundamental and any number of harmonics
in one sweep including the sub-harmonic. Depending on background
noise conditions, specialized anechoic test enclosures may
not be needed.
SoundCheck interfaces with many peripheral
devices including barcode readers, footswitches, or digital
devices via an RS-232 or IEEE-488 interface. Using a digital
input/output card, SoundCheck can easily integrate with
fully automatic production lines. Data and results can be
stored locally or on secure network drives. Pass/Fail limits
can be set either manually by inserting values or by offsetting
data from a measurement (e.g. ±3dB from the response
curve of a reference loudspeaker), or determined statistically
using SoundCheck's statistical analysis module SoundCheck
is an open software system. Since it is written in LabVIEW.,
many of the virtual instruments (VI's) are accessible to
be modified. New VI's can be created and run from SoundCheck.
In addition, SoundCheck can be controlled by another program
that is ActiveX compatible such as C++ or Visual Basic.
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