Calibration Services

A head and torso simulator consists of a head mounted on a torso, representing the international average dimensions of a human adult. In airborne acoustic measurements, it provides the correct simulation of the acoustic field around a human head and torso. The Acoustics Laboratory of the SCL provides calibration services of HATS covering the determination of the following parameters:

1. Maximum sound pressure level of HATS mouth,
2. 2^nd and 3^rd harmonic distortions of HATS mouth,
3. Sound pick-up free-field frequency responses of HATS ears.

The calibration is performed in accordance with the Recommendation ITU-T P.58 (05/2013) at the frequency range from 100 Hz to 10 kHz.

 

Audiometers are devices used to evaluate the hearing threshold of a person. The Acoustics Laboratory of the SCL provides calibration services of audiometers in accordance with the International Standard IEC 60645. The following tests are performed in the calibration:

1. Level accuracy of earphones,
2. Level accuracy of bone vibrator,
3. Attenuator steps accuracy.

Moreover, the following additional tests are provided by our laboratory:

1. Frequency of test signals,
2. Levels of masking noise,
3. Masking noise spectra,
4. Harmonic distortion of test signals,
5. Rise and fall times of test signals,
6. Cross-talk between earphone channels,
7. Distortion of speech input systems.

The calibration covers the frequency range from 125 Hz to 8 kHz.

 

Audio network analyzers are used to objectively quantify the audio performance of electronic and electroacoustical devices. The Acoustics Laboratory of the SCL provides calibration services on audio network analyzers which cover the determination of amplitude accuracy, amplitude linearity, frequency accuracy as well as amplitude ratio and phase between channels. The calibration covers the frequency range from 20 Hz to 100 kHz.