Digital Filter Analysis : Real - time and Non Real - time Performance
نویسندگان
چکیده
The Spatial Transformation of Sound Fields (STSF) technique involves a scan using an array of transducers over a (planar) surface close to the source under investigation. From cross spectra measured during the scan, a principal component representation of the sound field is extracted. Any power descriptor of the near field (intensity, sound pressure, etc.) can then be investigated by means of Near-field Acoustic Holography (NAH), while the more distant field can be determined by application of Helmholtz' integral equation. The theoretical foundation of the cross spectrum principal component technique implemented in STSF has been discussed by J. Hald in [1] and the advantages of STSF compared to a number of acoustical holography techniques have been demonstrated. In this article, the practical implementation of STSF is discussed and some applications are described.
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