Accurate Loudspeaker Measurements by Compensating the Room Influence
* Presenting author
Measurements of linear and nonlinear characteristics of Loudspeakers are usually performed in an anechoic environment. Measuring in a non-anechoic room, simulated free field conditions can be generated by windowing at higher frequencies. At lower frequencies a holographic measurement provides the required resolution by scanning the nearfield. Those accurate results are used as a reference for generating a correction curve for the fundamental component. Measuring harmonic distortion with transient stimuli, e.g. farina sweep or tone burst (CEA2010) a magnitude correction is not sufficient. In this paper, a new measurement technique is proposed that compensates room effects in the time signal of the microphone input by inverse filtering. Benefits and particularities are demonstrated by practical measurements using sweep and burst stimuli.