A problem for the classic beamforming approach is the limited dynamic range of the acoustic mapping. Louder sources are masking quieter sources. This limitation is valid for sources in the same frequency range. With multi band beamforming sources in different frequency ranges can be visualized with the only limitation being the dynamic range of the measurement system. Coherence filtering techniques allow for the distinction between incoherent sources and the detection of mirror sources. Here, the coherence between an additional sensor placed as reference close to the main source is used to filter the array signals increasing the overall dynamic of the acoustic source mapping. The real sensor can be replaced by a virtual sensor signal as result of the beamforming calculation allowing for a wider range of applications. Recent advantages in computer technologies allow for a real time processing of the microphone array data resulting in an online visualization of the sound sources.
Advanced beamforming techniques in vehicle acoustics
Verbesserte Strahlformungstechniken in der Fahrzeugakustik
2010
6 Seiten, 10 Bilder, 3 Quellen
Conference paper
Storage medium
English
Advanced Time-Domain Beamforming Techniques
AIAA | 2004
|Tema Archive | 2003
|Numerical Techniques in Acoustics
NTIS | 1985
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