Acoustic cameras are devices capable of displaying a visual representation of sound waves. Typically these devices relay on delay-based techniques, such as Delay and Sum Beamforming, being the calculation of the proper delay values a key component of the system. For real-time systems with a large amount of microphones it is not practical to perform such calculation being common to go for an offline strategy in which the pre-calculated values are stored in memory, allowing a faster dispatch of the data while increasing memory requirements. In this paper we present a technique for delay storage optimization based on various symmetries found within the pre-calculated values that allow a reduction up to almost 16 times over the initial memory requirements.

Authors: Sánchez-Hevia, Héctor A.; Mohino-Herranz, Inma; Gil-Pita, Roberto; Rosa-Zurera, Manuel
Affiliation: University of Alcalá, Alcalá de Henares, Madrid, Spain
AES Convention: 136 (April 2014) Paper Number: 9031
Publication Date: April 25, 2014 Import into BibTeX
Subject: Signal Processing
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=17178

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