Analysis

LabVIEW add-on: Advanced Signal Processing

Joint Time-Frequency Analysis
Unlike conventional signal analysis technologies, the JTFA (Joint Time-Frequency Analysis) software examines signals in both the time and frequency domains simultaneously. JTFA can be applied in almost all applications in which the FFT is used, such as biomedical signals, radar image processing, vibration analysis, machine testing, and dynamic signal analysis. However, with JTFA you get more information by analyzing the time and frequency domains simultaneously.

Like the classical Fourier analysis, the JTFA consists of two major methods - linear and quadratic. The linear algorithms include short-time Fourier transform (STFT) and Gabor expansion (inverse STFT). By using these linear transforms, you can transfer a signal from the time domain into the joint time-frequency domain and vice versa. It is extremely powerful for noise reduction. The quadratic methods contain adaptive spectrogram, Choi-Williams distribution, cone-shaped distribution, Gabor expansion-based spectrogram (also known as Gabor spectrogram), STFT-based spectrogram, and Wigner-Ville distribution. Applying the quadratic transforms, you can easily see how the power spectrum of a signal evolves over time. The Gabor spectrogram results in the best compromise between high resolution and cross-term interference.

Stand-Alone JTFA Application
The JTFA software includes a stand-alone Joint Time-Frequency Analyzer that does not require specific application software. The ready-to-run application analyzes stored data files, displays the spectrogram, and saves the spectrogram to disk. It can save and recall data and analysis to spreadsheet format. You can choose from six different types of quadratic JTFA algorithms - Gabor, short time Fourier transform (STFT), Wigner-Ville, Choi-Williams, and adaptive spectrogram. You can acquire data using DAQ hardware and use the JTFA Analyzer for post acquisition analysis.

Using the JTFA Utilities
The JTFA component of this toolkit also includes a VI library for use with LabVIEW to create your own custom analyzer. Several JTFA algorithms, including quadratic transforms as well as linear transforms, are delivered in VI source code so you can develop your own custom applications with LabVIEW and DAQ hardware.

Pricing and Purchase Information
LabVIEW Advanced Signal Processing Toolkit for Windows