The delays are represented as floating point numbers (unit 1 second) in the ASCII format. The results of the time delay determination between all channels will be copied into the clipboard and can be additionally transferred via DDE into a spreadsheet application like Excel. The maximum of the cross-correlation function is searched and its position is taken as the delay between each pair of channels. The multi-channel sound file necessary for two- or three-dimensional location can be created from several mono or stereo wav-files by the command File > Add channel(s) from file.Īlternatively, multi-channel files can be imported from external non-wav files acquired by other data acquisition devices (see Import Format for details). Otherwise, the algorithm will provide wrong results. The marked section should cover the signal to be measured in all channels. Only the marked section will be used for the cross-correlation. The command Copy single TDOA from marked section computes the delay of a signal that is present in all channels by using a cross correlation technique. If the positions of the microphones are known, the position of the sound-source can then be calculated by using a set of hyperbolic equations. The time differences at which the sound signals arrive at these microphones can be computed by cross-correlation. a vocalizing animal) by means of an array of microphones (passive acoustic location). It is possible to determine the position of a sound source (e.g. Main window : Analyze > Specials > Time-delay-of-arrival (TDOA) measurements >
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