Publication
Positional Tracking of a Moving Microphone in Reverberant Scenes by Applying Perfect Sequences to Distributed Loudspeakers
Fabrice Katzberg; Marco Maass; René Pallenberg; Alfred Mertins
In: Proc. International Workshop on Acoustic Signal Enhancement. International Workshop on Acoustic Signal Enhancement (IWAENC-2022), September 5-8, Bamberg, Germany, ISBN 978-1-6654-6867-1, IEEE, 2022.
Abstract
Moving microphones allow for the fast acquisition of sound-field
data. Such continuous sampling procedures require trajectory knowledge
for relating the dynamic samples to a positional context and
solving the involved spatio-temporal channel estimation problem.
Having one non-uniformly moving microphone, the hardware effort
is heavily dominated by additional tracking equipment. In this paper,
we present a low-cost tracking method using the microphone signal
itself, provided that loudspeakers at surrounding reference points are
excited by perfect sequences. As this is often the actual measurement
setup, the proposed technique can be seamlessly incorporated
into such dynamic sampling procedures. The acoustic tracking system
employs a polyphase decomposition and resampling scheme for
obtaining low-frequency estimates of the varying impulse responses
to the loudspeaker positions and applying multilateration.