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An Approach to Frequency Selectivity in an Urban Environment by Means of Multi-Path Acoustic Channel Analysis
Pau Bergadà1,2, Rosa Ma Alsina-Pagès3
1Grup de recerca en Tecnologies Mèdia (GTM), La Salle, Universitat Ramon Llull, c/Quatre Camins, 30, 08022 Barcelona, Spain. pbergadac@gmail.com.
Smart city noise analysis reveals that channel coherence bandwidth significantly impacts sound distortion. Narrower bandwidths increase signal distortion, affecting perceived sound quality in urban environments.
Area of Science:
- Urban acoustics
- Signal processing
- Smart city technologies
Background:
- Quality of life in smart cities extends beyond objective measures like noise levels.
- Acoustic perception is influenced by sound's spectral distribution, not just its overall level.
- Urban environments present complex acoustic challenges for propagation modeling.
Purpose of the Study:
- To analyze the acoustic spectral distribution of street noise.
- To investigate the role of urban outdoor channel frequency selectivity and coherence bandwidth.
- To understand the impact of channel characteristics on perceived sound.
Main Methods:
- Analysis of acoustic spectral distribution using simulated acoustic impulse responses.
- Evaluation of urban outdoor channel coherence bandwidth.
- Comparison of real-life acoustic samples with simulated channel effects.
Main Results:
- Coherence bandwidth significantly influences acoustic samples, indicating raw samples are wide-band.
- Accumulated energy at the receiver depends on channel coherence bandwidth.
- Higher delay spread correlates with narrower coherence bandwidth and increased signal distortion.
Conclusions:
- Signal distortion is higher in channels with narrower coherence bandwidth and greater delay spread.
- Energy distribution along frequency and time axes diverges based on channel coherence bandwidth.
- Understanding channel characteristics is crucial for accurate acoustic analysis in smart cities.
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