Transfer-Function Measurement with Sweeps

  • PAULO MASSARANI
  • Published 2002

Abstract

Compared to using pseudo-noise signals, transfer function measurements using sweeps as excitation signal show significantly higher immunity against distortion and time variance. Capturing binaural room impulse responses for high-quality auralization purposes requires a signal-to-noise ratio of >90 dB which is unattainable with MLSmeasurements due to loudspeaker non-linearity but fairly easy to reach with sweeps due to the possibility of completely rejecting harmonic distortion. Before investigating the differences and practical problems of measurements with MLS and sweeps and arguing why sweeps are the preferable choice for the majority of measurement tasks, the existing methods of obtaining transfer functions are reviewed. The continual need to use pre-emphasized excitation signals in acoustical measurements will also be addressed. A new method to create sweeps with arbitrary spectral contents, but constant or prescribed frequency-dependent temporal envelope is presented. Finally, the possibility of simultaneously analysing transfer function and harmonics is investigated.

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@inproceedings{MASSARANI2002TransferFunctionMW, title={Transfer-Function Measurement with Sweeps}, author={PAULO MASSARANI}, year={2002} }