New Add-On Analysis Toolkit Enhances LabVIEW

Time-Frequency Analyzer Executable Also Available

October 20, 1993 -- Austin, TX - National Instruments announced today two
new signal processing products for the company's multiplatform LabVIEW
graphical instrumentation software. The Joint Time-Frequency Analysis
(JTFA) Toolkit is a new add-on virtual instrument (VI) library that
enhances the signal processing capabilities of LabVIEW on nonstationary
signals. Users can combine the JTFA Toolkit VIs with LabVIEW in speech
processing, sonar, acoustics, vibration, machine test, and signal
processing applications, or in applications when traditional waveform and
frequency analysis alone are inadequate. The toolkit includes the
Time-Frequency Analyzer LabVIEW executable for users who do not have
LabVIEW but who are performing joint time-frequency analysis. The
Time-Frequency Analyzer executable reads data files of time signals,
transforms the signals into the time-frequency domain, and displays the
results in a spectrogram.

LabVIEW is a graphical programming system for developing data acquisition
and analysis applications on Macintosh computers, Windows-based PCs, and
Sun SPARCstations. Both the JTFA Toolkit and the Time-Frequency Analyzer
executable will be available for all three of these platforms.

About the JTFA Toolkit Traditional Fourier analysis reports what
frequencies are present in a time record. It does not indicate when those
frequencies occurred in time. It is the aim of the JTFA Toolkit to
describe and determine how the frequencies of nonstationary signals change
over time. The JTFA Toolkit is an add-on VI library for LabVIEW. It
includes six algorithms - the short-time Fourier transform (STFT), the
Wigner-Ville distribution, the cone-shaped kernel distribution, the
Choi-Williams distribution, the Gabor Spectrogram, and the adaptive
spectrogram. Users can acquire signals with data acquisition hardware,
such as the company's plug-in dynamic signal acquisition boards, use an
algorithm from the JTFA Toolkit to transform the signal, and display the
signals as a two-dimensional intensity plot of time-frequency data. Users
will also be able to present signal analysis results using the
three-dimensional plotting capabilities of SurfaceVIEW, a LabVIEW add-on
package from Metric Systems (Round Rock, TX). The JFTA Toolkit is designed
for use as a postprocessing analysis tool; however, LabVEW users can
modify the block diagram source code included in the package to make
custom lTFA applications.

About the Time-Frequency Analyzer Executable 

The Time-Frequency Analyzer executable program was built using the
company's new LabVIEW Application Builder. With Application Builder,
LabVIEW users can create VIs that operate as stand-alone executables. Once
selected, the Time-Frequency Analyzer will load, execute, and unload
automatically. The LabVIEW source code for the Time-Frequency Analyzer can
be edited with LabVIEW Version 3.0, so users can alter and customize it
for their individual applications.

Price, Availability, and For More Information 

The JTFA Toolkit will be available in late October for $495. For more
information contact National Instruments, 6504 Bridge Point Parkway,
Austin, TX 78730-5039, (512) 794-0100, (800) 433-3488 (toll free U.S. and
Canada). Fax (512) 794-8411.

SurfaceVIEW is available now for $250 from Metric Systems, 1506 Taron
Drive, Round Rock, TX 78681, (512) 4458. Fax (244-7203).

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