Akustik-Blog

Ultrasonic metal welding is a solid-state bonding process in which metal workpieces are exposed to high-frequency vibrations. It is an effective joining technology with a wide range of industrial applications with its unique advantages. The vibrations of mechanical parts in the machine cause fluctuations in the air pressure, thus causing sound waves to radiate. The […]

Ultrasonic Metal Welding (USMW) is a quite important welding technique, because of the relative low heat this welding process generate, it is used in numerous industrial applications. However, this welding technique have a disadvantage, the welding strength have large variance despite the same values of input machine parameters. Thus, to improve this welding technique more […]

The IHTA park is used as a case study for a lot of the institute´s research on auralisation and visualisation of urban scenes. An audio-visual model of the park already exists, which uses synthesised sounds for the dominant technical transportation sounds, while inserting recorded sounds as background sounds. Hence, a database of recorded background sounds […]

Die Hörbarmachung urbaner Lärmszenarien mittels Außenlärm-Auralisationen ist neben geeigneten Modellen zur Simulation von Schallausbreitung- und empfängern angewiesen auf Modelle von bewegten Quellen wie beispielsweise PKW. In dieser Arbeit wird die Unsicherheit der Quellparameterschätzung von Vorbeifahrtgeräuschen der Fahrzeuge untersucht. Dazu werden die realen Richtcharakteristiken des Mikrofons analysiert. Außerdem werden die Auswirkungen unsicherer Parameter bei der Berechnung […]

Auditory selective attention (ASA) is a common phenomenon which describes the ability to intentionally focus on a specific source of sound while ignoring other irrelevant sounds. Since in real life there are usually visual distractors in addition to auditory distractors, the effect of visual stimuli on ASA is also worth investigating. The purpose of this […]

In tropical countries, air conditioning systems are widely used to improve indoor climate. In many cases, natural ventilation can also provide thermal comfort for users with less energy consumption and better air quality as long as the pollution outdoors is not too high. However, openings in the facades for natural ventilation decrease the sound insulation. […]

The simulation of audio-visual performance is despite technological advancements still a challenging task which usually requires researchers to simplify problems in order to reduce computational complexity, sacrificing both auditory and visual fidelity. This raises the question as to what degree a model can be simplified without a noticable loss of quality. In order to analyze […]

Angetrieben durch die Reduzierung von Lärmbelastung und Simulation von Schallausbreitung kann akustische virtuelle Realität (AVR) zur Durchführung von Untersuchungen eingesetzt werden. Zunächst wird bildbasierte photogrammetrische Software verwendet, mit der ein städtisches Küstengebiet nachgebildet wird, um eine visuelle Darstellung der komplexen Umgebung zu generieren. Photogrammetrie erzeugt fotografische Punktwolken, die für immersive Anwendungen oder traditionelle Wiedergabemedien zu […]

The term irrelevant sound effect (ISE) refers to a significant reduction in the immediate serial recall of lists of presented items, usually digits or letters, when irrelevant auditory sound is presented together with the items to be memorized. This study aimed to investigate the impact of signal-to-noise ratio (SNR) and presentation modality on short-term memory […]