Abstract
In the previous chapter we saw how acoustic (or any other) signals may be examined in either the time or the frequency domain by means of the Fourier Transform (the FT). The FT is a continuous analytic integral, which is calculated digitally in most modern spectrum analysers. The digital implementation of the Fourier Transform (defined by equations 4.15 and 4.16) necessarily involves sampling the data. Sampling can introduce undesirable effects such as aliasing, which may lead to erroneous results in the hands of the unwary user.
I have done the deed. Didst thou not hear a noise?
Love’s Labour’s Lost, Shakespeare
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References/Further Reading
J. S. Bendat and A. G. Piersol, Engineering Applications of Correlation and Spectral Analysis, Wiley (1980).
R. B. Randall, Frequency Analysis, 3rd edn, Bruel & Kjaer (1987).
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© 1991 J. D. Turner and A. J. Pretlove
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Turner, J.D., Pretlove, A.J. (1991). Digital methods of spectrum analysis. In: Acoustics for Engineers. Palgrave, London. https://doi.org/10.1007/978-1-349-21267-5_5
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DOI: https://doi.org/10.1007/978-1-349-21267-5_5
Publisher Name: Palgrave, London
Print ISBN: 978-0-333-52143-4
Online ISBN: 978-1-349-21267-5
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