Acoustic measuring techniques deal with the acquisition and evaluation of physical quantities that are relevant for the investigation of acoustic phenomena. Modern data acquisition systems are normally PC-based, so the main areas at the ITA are:

Development/Implementation of

• High quality circuits for signal-conditioning
• AD/DA converters (multi-channel measuring system ModulITA)
• PC interface cards (e.g., 8-channel DSP-PCI-card)
• Algorithms for signal-analysis (e.g., with MATLAB)
• Software for digital signal processors (DSP-multiprocessor-system HUGO)
• Additional hardware (e.g., turn-table, deflection unit for laser scanner)

Applications

• 3D-directivity of loudspeakers, diffusors, HRTF
• PC-based contactless measuring of oscillations
  • Wall vibrations of organ pipes
  • Optical measuring and calibration techniques for microphones
• Digital impulse and correlation measurement technique 
• Dummy head measurement technique
• FFT-, Sweep-, Maximum length sequence applications
• Measurement of the scattering coefficient in the reverberation chamber
• Extended impedance tube measurements for determination of transmission factors and acoustic impedances
• Documentation and brief description of our data acquisition program Monkey Forest (MF)