Currently, the education in acoustics at Heilbronn University is only representing by a lecture technical acoustics (2 ECTS) that gives each winter semester an overview of acoustic issues. Under the aspect of expanding the acoustic course offer, a laboratory technical acoustics (3 ECTS) will be introduced for prospective summer semesters.
The most important requirements for the laboratory concept are to achieve the following aims:
a) The students' comprehension of basic acoustical phenomena shall be a focus,
b) The experiments shall deal with actual problems close to our areas of research, as well as general tasks given from surrounding industrial companies, c) The expansion of knowledge in our core competence fields with student support in projects, bachelor or master thesis';
According to the number of expecting participants in conjunction with available locations (anechoic measuring room, jury test room, echo corridor, auditorium, laboratory electronic circuit technology), groups of two or three students may work for their own of a total of six different experiments.
It will make sense to correlate the topics of the laboratory with the topics of the lecture. Therefore, the practical tasks will be located in psychoacoustics, room acoustics, electro-acoustics, acoustic quality control, multi-channel playback/recording and passive/active noise control.
SNR=11.0dB). For OLSA noise in S0N0-condition, the results differ less (
) and monaural (NoSo) tone in noise detection thresholds for masker bandwidths that varied from 10 to 1000 Hz while the tone to detect had a frequency of 500 Hz. Thresholds are expressed as signal to masker spectrum level ratio (S/No). For bandwidths less than 1 ERB, thresholds in all measured conditions increase with increasing masker bandwidth. For bandwidths wider than 100 Hz three different behaviors are observed. Thresholds for NoSo conditions with a running noise masker remain essentially constant which is in line with the critical band paradigm. In contrast, thresholds for NoSo conditions with frozen noise masker and NoS
. These are not only investigated for the floor-floor flanking transmission path, but also for all the other possible paths (e.g. floor-wall, floor-ceiling and wall-ceiling). Although applied in different frequency ranges, the results of the FEM and the SEA analyses agree fairly well with those obtained in the laboratory tests.
) and increased them at larger angles. The reaction time difference was up to
80 ms. Furthermore, cueing seems to have no effect on sound localization: false
alarms were normally distributed around the hits. These findings demonstrate
that strong auditory capture effects occur that depend on cue-target distance.
The second study shows how an auditory non-informative spatial cue influences
detection of visual targets. Here the results show performance benefits when
the target was preceded by a cue presented at target location and performance
costs when a cue was presented elsewhere. Additionally, this study shows that
even when attention is highly visually focused by means of a 100% valid
endogenous visual cue, auditory stimuli still capture visual attention.
27'000 simulated flights) and the extended simulation (
s and e.g. a PRF of 250 kHz the coding gain of GC is 1.6 dB higher than the coding gain of SC. Consequently, GC is more suitable for PACE than SC.
are not connected rigidly to the adjacent building elements. They are commonly decoupled from the adjacent construction elements with elastic interlayers made of bitumen, cork or polyethylene foam. The direct sound insulation of the gypsum walls is depending on the kind of the used elastic interlayers. The elastic interlayers have also a significant influence on the flanking sound transmission of the gypsum walls. Therefore the decoupled walls have to be treated different to rigidly connected walls.
s2/m was obtained for an accelerometer consisting of a single ferroelectret film with d33
500 pC/N in the audio frequency range, a seismic mass of 9 g, and an area of 3 cm2. A theoretical description of the various accelerometers has been achieved using simple models. Experimental and theoretical data were compared and showed good agreement. The results demonstrate that ferroelectret-film accelerometers have advantageous properties, in particular when adapted to specific applications.
and the sound insulation index 
were determined by in-situ measurements according to DIN EN ISO 1793, part 5. Results of the reflection
index for several materials, grain sizes and layer thicknesses of the charge of the wire mesh are
presented.
tempo 
each. The rooms are separated by a standardised concrete slab which is excited by the ISO tapping machine. The sound pressure levels in the receiving room are measured twice, once without and once with the floor covering. From that difference, the impact sound reduction of the covering can be calculated.
Manufacturers of floor coverings in Germany - mainly small and medium enterprises - expressed their interest in a lower measurement effort and thus a joint research project of Forschungsinstitut für Leder und Kunststoffbahnen FILK and PTB was initiated to develop a simplified measurement method. It involves measurements of vibration levels on a concrete slab of 0,8 X 1,2 m, once with and once without the floor covering. The vibration level differences are treated like sound pressure level differences, and it turned out that the procedure works well for locally reacting coverings. Besides these results, possible extensions to one of the standardised timber joist floors according to ISO 140-11 and to plate-like coverings like laminate will be discussed.