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C. Kaseß, T. Maly, P. Balazs, W. Kreuzer:
"Time-variant signal manipulation using frame multipliers";
Vortrag: Euronoise 2021, Madeira, Portugal; 25.10.2021 - 27.10.2021; in: "Proceedings", (2021), ISBN: 978-989-53387-0-2; Paper-Nr. 68, 10 S.

To better understand the relation between annoyance and acoustic properties of environmental noise, laboratory studies with defined noise samples are often performed. To reduce measurement effort, sample generation through manipulation is an important approach. In some cases, it is necessary to use time-variant filters, e.g., to extract signal components whose frequency content changes over time. The method presented here is based on frame multipliers. This allows the definition of such filters directly in the time-frequency plane. The versatility of this approach is illustrated using curve squeal of railway vehicles, which can comprise narrow-band components affected by the Doppler shift but also broadband noise which may vary in intensity and frequency range. Multipliers are used to extract the relevant signal portions and to combine defined pass-by noise samples with the extracted squeal noises to produce well defined test conditions.

time-varying filtering, frames, multipliers, curve squeal, test stimuli