Audio Analyzer for acoustical and electrical measurement

The ATB PC Pro measurement program in connection with the soundcard of a computer is a precise and extensive Audio Analyser.


  • Electrical frequency response

  • Acoustical frequency response  

  • SPL

  • Electrical Phase Response

  • Acoustical Phase Response

  • Step Responce

  • Impedance

  • Thiele-Small Parameter calculator

  • Distortion

  • THD and IMD

  • Nonlinear distortion measurement


The Audio Analyser is for loudspeaker development, optimizing room acoustics, installation of Car HiFi systems and measurement calibration of surround systems.


The Windows ATB PC measurement program is built around the success of the professional ATB precision program. It offers all the functions of the Windows operating system.

Measurement technology:

The measurement signal by an internal generator function is generated by the soundcard. With our external generator function, a CD or DVD player generates the measurement signal. Therefore, older computers with simpler soundcards are adequate for the measurements. To be independent from the quality of the soundcard the program has an extensive correction function to compensate the less than ideal soundcard parameters.

The ATB PC has its own Mixer for the soundcards. Therefore, the selection and setting of the Soundcard is easy to handle.

Measurement signal:


The special M-PN signal in combination with a new correlation method avoided the frequency faults of the MLS soundcard systems. This also allows an acoustical measurement without determining the distance. In addition, no time windows need to be set. This makes the operation as easy to use as a 1/3 octave analyser. For setting the subwoofer in home cinema systems there is a mid-high and a subwoofer signal.

Signal 13

The Signal 13 is for the distortion measurement. For the THD measurement is the sine wave signal. It is also for nonlinear distortion measurement.

Wolfgang Klippel, Germany, describes the distortion from nonlinear systems.

The basic for this measurement is a generator signal with consist of two sine waves. The signal is modulated at the nonlinear transfer response of the system under test. The result is the THD and the IMD spectrum.

The Signal 13 was developed from the Kirchner elektronik company. The signal consisting of the heterodyne of two sine waves with the ratio of 1:1,3. This gives a non-static signal. The signal 13 is for testing distortion like THD, IMD und nonlinear distortion.

The time domain of the Signal 13

The frequency spectrum of the Signal 13

The time domain of the signal shows an always-varying wave. The signal excited all resonances of the unit under test. The resonances and the nonlinear transfer function show a spectrum with a great number of distortion frequencies.

For the calculation of the Q-index the amplitude of distortion frequencies are added and set into proportion to the amplitudes of the Signal 13. This measurement shows the quality of a device.

Data Export:

So that the measurement data can be further processed with a CAD program or saved in an existing database, the ATB PC has an export function. The ATB data can be converted into following formats:

        MLSSA, LAUD, IMP, LMS and CLIO.

The program also has an Auto-Export function for simple processing or evaluation of the data with user specific programs.

The ATB PC Pro measurement system includes:

  • Program,

  • Thiele-Small parameter calculator,

  • Handbook,

  • Measurement microphone,

  • Test box for impedance and

  • calibration measurement,  

  • Dongle,                                   

  • Frequency range of the microphone

  • DVD and CD for test signals      

  • 20Hz 20kHz  + 0.3dB                                        


 www.kirchner elektronik.de