The ARI lab consists of four testing places:

  • GREEN and BLUE: Two sound-booths (IAC-1202A) are used for audio recording and psychoacoustic testing performed with headphones. Each of the booths is controlled from outside by a computer. Two bidirectional audio channels with sampling rates up to 192 kHz are available.
  • RED: A visually-separated corner can be used for experiments with cochlear implant listeners. A computer controls the experimental procedure using a bilateral, direct-electric stimulation.
  • YELLOW: A Semi-Anechoic Room, with a size of 6 x 6 x 3 m, can be used for acoustic tests and measurements in a nearly-free field. As many as 24 bidirectional audio channels, virtual environments generated by a head mounted display, and audio and video surveillance are available for projects like HRTF measurement, localization tests or acoustic holography.

The rooms are not only used for measurements and experiments, but also for speech recordings, speaker identification and survey reports.

During the breaks in experiments, the subjects can use an internet terminal or relax on a couch while sipping hot coffee...

A semi-anechoic room (6.2m × 5.5m × 2.96m) is available for acoustic measurements. Also psychoacoustic experiments like sound-localization experiments can be performed.

The room is equipped with:

    • a 22-loudspeaker array for HRTF measurement;

    • 64-microphone array for various recording approaches (beam forming, near-field holography);

    • a virtual-environment setup for tests with subjects in a virtual visual and acoustic environment controlled with a head tracker in real time.

    • equiment for speech recordings for speaker identicication


DSCN0612 22 loudspeakers in the median plane generate acoustic signals from almost every direction. The listener is placed on a computer controlled swivel chair. DSCN0614