9.4 Auralization

Listening to a dataset

In the Analyze module it is also possible to auralize Blocked Forces and TPA syntheses that have been converted to the time domain. To do so, plot either of the time domain data and click on the green play symbol at the top of the graph. The cursor will appear to indicate the position of the playback in the signal and the channel is played. In the toolbar you can also pause, stop, or change the volume of the playback. It is also possible to drag the playback cursor to the left and right within the plot to play the audio at a different instance in time.

If multiple graphs are plotted at the same time, you have to choose which one to play by selecting it in the drop-down menu in the toolbar.

In the audio playback toolbar, it is also possible to set values that correspond to the maximum volume. If the Abs feature is not activated, the maximum value of the plotted channel is used as the maximum level of the audio card.

If you want to compare different datasets, this setting could be misleading because, for all of the datasets, the maximum value of the plotted curve will be set differently, making the comparison impossible. To overcome this issue, you can tick the Abs box and define the value that corresponds to the maximum volume of the audio card. This value will be used for all the datasets that are played back. This value has to be defined in linear engineering units.

Audio playback in the Analyze module

Filtering a dataset

In some cases, you might need to filter the input data when performing the auralization of the results. This could be the case, for example, if the dataset presents some noisy frequencies or if there are some “clicking” noises.

In the Analyze module of SOURCE, you can decide whether to apply a low-pass filter, a high-pass filter, or both. The filters can be found in the Analyze module in the settings. To apply the filtering, you must type the cutoff frequency in the field. The cutoff frequency must be specified in Hz.

Both filters are applied to the spectral data before being converted to the time domain. The filters approximate a Butterworth response with a filter order of 8 and zero phase delay.

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