HIGH SPEED QUASI-ANECHOIC MEASUREMENT

Experiments involving acoustical components require the ability to make quick and accurate linear transfer function measurements.

Measurement Lab DSA was designed from the ground up to make transfer function measurements fast and organized, on a platform built from COTS hardware. At the core of Measurement Lab DSA is a best in class gliding tone type stimulus-response algorithm. This proprietary algorithm, developed by Cascade Acoustic Research, yields measurements with excellent SNR, allows analysis of distortion products separated from the linear response, and gives the user control over the stimulus instantaneous frequency curve.

National Instruments PXI-4461 DSA
Measurement Lab DSA

Although Measurement Lab DSA is not available for sale to the public yet, a list of features and screen shots, as well as development status updates can be found on the product page. After the completion of a stable internal release, a select number of copies will be available for testing by end-users. Our goal is to produce a software package with a complete set of features and post-processing algorithms which are fully documented and tested before making the product available for public sale.

If you are interested in trying Measurement Lab DSA, have a request for a feature which your current measurement solution does not provide, or have any other questions regarding the product, don’t hesitate to e-mail or call our office.

Endevco Preamplifier

ANALYSIS BEYOND FOURIER

The constraints of Fourier analysis can limit the visibility of events which span the time-frequency plane.

The advantage Time-Frequency Representations (TFRs) have over many of the traditional ways to visualize data is that evolution of the frequency content of a signal with time is easily identified. At first this does not seem to be important, especially when so much is possible by simply measuring a device, and making adjustments from a view of the frequency domain. But this immediately leads to the question of how much of the picture is being missed by looking at no temporal information.

WVD of Lowpass Elliptic Filter
GCD of Lowpass Elliptic

Joint time-frequency analysis is not without its drawbacks. Many of the distributions in common use are plagued by a trade off between time and frequency resolution, interference terms, and large memory requirements. These drawbacks have caused many, especially those in the professional audio industry, to dismiss their use as nothing but a novelty, or to use the information they provide improperly.

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