High-Resolution 1/3 Octave Analysis
Now Available for Download
Bellevue, WA, September 23, 2010 -- Microstar Laboratories, Inc., maker of Data Acquisition Processor (DAP) systems for PC-based high-performance measurement applications, has released a software package for audio analysis, for use with its xDAP systems. Using this package with just two extra lines of configuration script adds high-precision 1/3 octave analysis to your measurement application. In effect, your general-purpose xDAP system is transformed into a specialized audio analyzer instrument. This package is available for free download from the company's web site. It includes a technical note explaining how to customize the software to optimize individual applications. You can send the octave analysis results to the PC application environment of your choice.
A 1/3 octave analysis partitions a power spectrum into logarithmically-spaced frequency bands, corresponding to the manner that audio tones are perceived. There are alternative solutions for doing this, with various tradeoffs in capability and price. Single-purpose dedicated instruments do an excellent analysis, but building a good instrument is very challenging, and costs are high. GUI-based analytical software systems offer signal processing toolkits that can perform a similar analysis, but this too is very expensive, and ties the application inextricably to a high-overhead software environment. The solution of using an xDAP system and this free configuration software results in a streamlined system with high performance, low net cost, and compatibility with any software environment you want.
The embedded 1/3 octave analysis uses the
The resolution of the 1/3 octave analysis is extremely high. This differs from behaviors you would get from typical "reference implementation" instruments using 6th-order bandpass filters (or their digital equivalents). This means that a signal registering as a crisp single band in the high-precision analysis would appear as a "multi-band smear" in a traditional instrument. If it is necessary to match such traditional behaviors, supplemental processing to distribute the high resolution spectrum results into neighboring bands is possible. Other supplemental processing could convert the results to RMS amplitude, dB gain, or physical power units.
The DAPL 3000 operating system and an xDAP measurement system provide the environment where embedded 1/3 octave preprocessing can run. Within that environment, the special processing operates much the same as ordinary data acquisition or control processing. When offloaded from the host system, complex number crunching operations do not burden orderly processing within host applications, making the applications easier to build. Though multiple DAP boards can work together for large scale applications, octave analysis applications will seldom need that much processing power, and one xDAP system working alone can provide audio spectrum analysis on eight or more full-range audio channels simultaneously. The xDAP configuration is assisted by DAPstudio software. DAPstudio can display spectrum data "in real time", while simultaneously logging results. This alone might be sufficient for data recording and display applications.
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New audio analysis software, available for download, can configure an xDAP measurement system to perform a rigorous and cost-effective 1/3 octave analysis. Adding this capability to a measurement configuration requires two lines of configuration script, lines that coordinate the DAPL 3000 system
Note to the Editor
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DAPstudio displaying 8 full-spectrum audio channels
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