22. STEP RESPONSE22.1 THEORYThe step response shows the amplitude and the phase simultaneously. It is calculated usingboth measurements. The first thing done is to calculate the impulse of the sinus oscillationthrough a complicated addition, with value and phase. Because the impulse is a mathematicalfactor, ideally the amplitude is infinite; its image is hardly determinable. For instance thefrequencies are not distinguishable. Therefore the integration of the step response is calculatedwith a mathematical function. The image of the step response entails all the importantinformation about the qualities of the transfer distance.The ATB PC program contains an analysis function for the step response. Usually allfrequencies within the range of 20 Hz – 20 kHz of the step are displayed. This is especiallydifficult by loudspeakers e.g. when testing the cross over between subwoofer and middle/hightones, it is better to not even starting to show the high tones. Therefore in the ATB PC programthe frequency range for the frequencies displayed by the step response can be adjusted.Step response of a linear transfer distance65AtStep response of the loudspeakerAt
