PUB - Audiovisual and cognitive effects in loudness judgments of an excavator with hydraulic pump
In the context of the "47th Annual Conference on Acoustics Vienna" a paper on "Audiovisual and Cognitive Effects in the Loudness Assessment of an Excavator with Hydraulic Pump" has been published.
Authors: Georgi, Markus; Pietrzyk, Tobias; Schmitz, Katharina; Schlittmeier, Sabine Janina
The work activities of construction machinery can cause serious noise pollution or nuisance for both workers and residents. Due to the increasing electrification of construction machinery, noises that were previously masked by the combustion engine are now coming to the fore. In the present laboratory study, the subjective loudness of transient sound signals generated by systematically varied work cycles of an excavator arm with hydraulic pump is investigated.In a listening test, 32 subjects assessed the subjective loudness of pre-recorded audiovisual scenes of a compact excavator. The 16 scenes were created by various combinations of speeds and deflections of an excavator arm with hydraulic pump. In one block of trials the scenes were presented with a picture (audiovisual condition), in another block of trials without a picture (auditory condition). After each scene, the subject indicated the subjectively perceived loudness on a 50-point category subdivision scale (KU scale).It was found that the scenes without picture were perceived as louder than with picture. Similarly, higher speed and greater excavator arm deflections were generally perceived as louder. Steady excavator arm movements were perceived as less noisy than those with speed changes. If the latter occurred at the end of a motion sequence, these scenes were perceived as louder than if the speed change occurred at the beginning of the sequence.Implications of the results are discussed with respect to cognitive effects in the loudness perception of transient signals (e.g., primacy vs. recency effect).