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Time Frequency Analysis (TFA)

Features and Benefits

The Time-Frequency Analysis (TFA) visualizes the characteristics of an audio signal over time and frequency. Using recorded signals of the audio system, the TFA helps to investigate the impulse response as well as different kind of distortions (harmonics, intermodulation, impulsive …). Both temporal and spectral information are used to identify defects with random properties (e.g. loose particles), which generate distortion components distributed over all frequencies.


  • 3D defect analysis (Rub & Buzz)
  • Detecting acoustical and mechanical resonators (room modes, rocking modes)
  • Visualizing harmonic and intermodulation distortion

Analysis Methods:

  • Wavelet transform
  • Short-time fourier transform (STFT)
  • Filter bank


dB-Lab software (210 or higher)

Related Information

Other Modules of the R&D System
Transfer Function Measurement (TRF):
  Measurement of transfer function and harmonic distortion

Other Modules of the QC System
Spectrogram 3D Limits (3DL)
  Powerful and intuitive defect (Rub & Buzz) analysis based on auditory time/frequency (spectrogram) analysis

Literature and Papers
Perceptual and Physical Evaluation of Guitar Speakers
• Rub&Buzz Testing

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