Source to receiver distance

The source to receiver distance is estimated based on the initial time delay detected from the primary impulse response, and the speed of sound, as described in the Window active response section. For the initial time delay, and thereby the source to receiver distance estimation, to be correct, the measurement must be performed with loop-back or a synchronized sound card. Even if this is the case, there will be an extra delay because of the sound card delay. This is set as 40 samples as default (set in Measurement->Sound Card Settings...). However, if measurement system correction is used, this delay will be corrected for (set with the button in the Measurement Settings Toolbar).

The source to receiver distance is always output in the result grid or file, and is used in some of the reference level calculation procedures described in the Strength section.