Acoustic Measuring Techniques

  Pcture of the microphone array for measuring directivities of musical instruments including a saxophone player. The microphones are arranged at the tips of a Pentakis-Dodecahedron at a radius of 2 m. G. Behler ITA

Measuring technology in acoustics deals with collecting and evaluating physical data, which is relevant for researching acoustic properties. As modern measuring technology collects and evaluates data almost exclusively in digital form, the following main areas arise:

Development/Programming of

  • sophisticated circuitry for signal conditioning/amplification (analogue technology)
  • high-definition AD-DA converters (i.e. multi-channel measuring system ModulITA)
  • ITA toolbox under MATLAB for multichannel measurement of signals, signal analysis and signal processing
  • special hardware solutions (i.e. 3D measuring equipment for directivity, HRTF-measuring arch, laser scanner vibrometer etc.)

Applications

  • 3D directional characteristics of sound sources (loudspeakers, musical instruments, singers, etc.)
  • Quick measuring of 3D-directional characteristics of sound receivers (HRTF - ears)
  • Non-contact vibration measurements on converters and machines
  • Artificial head measuring technology
  • Correlation measuring technology for linear systems (sweep technology, maximum-length sequence technology)
  • Extended impedance tube measuring to determine the transmission factor and acoustic impedances
  • ITA toolbox for measuring, evaluating and illustrating acoustic measurement parameters