On response measurements using deterministic types of periodic signal and FFT

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TypeArticle
Proceedings titleCanadian Acoustics/Acoustique Canadienne
ConferenceAcoustics Week in Canada, 17-21 October 1994, Ottawa, Ontario, Canada
ISSN0711-6659
Volume22
Issue3
Pages4546; # of pages: 2
SubjectAcoustics
AbstractSystem response measurements appear in many areas of scientific and technical investigations. The speed of these measurements has been greatly improved with the advent of FFT analyzers. Conventional FFT analyzers require two channels to measure the system response using white noise as a stimulus. Bias errors such as aliasing, leakage, and picket fence effects have to be properly addressed and random errors have to be minimized by averaging. Uses of deterministic types of periodic signal as stimulus are not common although most of these errors would disappear. The inflexibility of the commercial FFT analyzers may be an important reason. To analyze periodic signals, it is necessary to use an `exact' multiple of the period of the signal to avoid leakage effect. It is also necessary to ensure that the signal frequencies coincide `exactly' with the analysis frequencies to avoid picket fence effect. This will require some tailoring of the sampling frequency and the number of data points. We explore the application of deterministic types of periodic signal for system response measurements using a dual channel A/D converter and a special FFT routine. Two types of periodic signal are discussed: (1) pure tones for single frequency measurements and (2) m-sequence or maximum-length sequence (MLS) for broadband measurements
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Research in Construction
Peer reviewedNo
IdentifierIRC-P-3893
NRC number38494
5410
NPARC number20330942
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Record identifier62b692bb-ebf8-4f6f-8c3a-0285129cd9a2
Record created2012-07-18
Record modified2016-05-09
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