Sound Power Measurement with 4472

Is onboard DSP a must for any Sound Power Measurement?
I know that NI-Sound Power Plus works only with 455x.
Is it simply because NI has not yet written a software for Sound Power Measurement using 4472 or is it technically NOT possibly to do Sound Power Measurment using 4472?
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu

1. The 6036E is a "sweet" card for high-speed, high-accuracy DAQ on the PCMCIA bus. Even at 10-times oversampling you can achieve 15-20 kHz of response with nice line resolution in the FFT. My experience with the PCMCIA bus has shown a wild variation in DAQ bandwidth (IBM/Compaq...the PITS -- Dell...the best ; and , no I do not work for Dell). For signal conditioning, I use SCXI (so I can not comment on the use of the other components). If you can live with interchannel skew, the set up looks quite promising. Our DAQ requirements demand the use of simultaneous sample-and-hold (SCXI 1140) for either two-channel hot-film measurements or multiple sound pressure measurements with precise cross-correlation (to eliminate wave reflections and e
chos within the test article). Our microphones were developed by NASA for use in VERY HIGH temperature environments, so our signal conditioning ahead of the 1140 is made from custom devices.
2. It is important to note that any toolkit add-on to LabVIEW "could" be written by the end user using the very same subVIs distributed with the Full Development System. Sound power is merely a term used to describe a particular mathematical method involved in transforming the acquired sound data from the real domain to the frequency domain. The mathematical methods have been used for many decades. I use my own custom code originally developed in FORTRAN, converted to C++, and now embedded in a code interface node (CIN). The issue to resolve comes down to a) do you have the in-house capability to write and support detailed code development, or, b) do you purchase the toolkits and thereby achieve the capability very quickly. Although the toolkits are expensive, the burdened cost of, say, 1
additional highly-skilled employee could cost 20 times as much.

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