Print Email Facebook Twitter Clock-Offset and Microphone Gain Mismatch Invariant Beamforming Title Clock-Offset and Microphone Gain Mismatch Invariant Beamforming Author Kotti, Sofia Eirini (TNO) Heusdens, R. (TU Delft Signal Processing Systems) Hendriks, R.C. (TU Delft Signal Processing Systems) Date 2020-08-01 Abstract The use of wireless acoustic sensor networks (WASNs) has received increased attention over the last decade. The advantages of WASNs over stand-alone multi-microphone devices are that the microphone array is not anymore limited by the dimensions of a single device, and that microphones can be placed at arbitrary locations. One of the disadvantages, however, is that for many applications, like beamforming, the clocks of all devices in the network need to be synchronised and that the microphone gains need to be equalised. In this paper we will prove that a specific class of beamformers is clock-offset and gain mismatch invariant. The parameters for these beamformers (acoustic transfer function and power spectral density matrices) can be estimated directly from the uncalibrated microphone signals, instead of first synchronising the clocks and equalising the gains and then estimating them. The resulting beamformers are applied to the non-calibrated microphone signals. We will substantiate, by means of computer simulations, that the proposed approach gives identical results compared to the setup where microphone signals are first calibrated, so that clock-offset compensation and microphone gain equalisation becomes unnecessary. Subject Beamformingclock synchronisationmicrophone gain equalisationwireless acoustic sensor networks To reference this document use: http://resolver.tudelft.nl/uuid:7b86f579-0c6d-40b0-a294-54b7e3f51318 Publisher Eurasip, Amsterdam (Netherlands) ISBN 978-9-0827-9705-3 Source 28th European Signal Processing Conference (EUSIPCO 2020) Event EUSIPCO 2020, 2021-01-18 → 2021-01-22, Amsterdam, Netherlands Part of collection Institutional Repository Document type conference paper Rights © 2020 Sofia Eirini Kotti, R. Heusdens, R.C. Hendriks Files PDF 0000176.pdf 383.53 KB Close viewer /islandora/object/uuid:7b86f579-0c6d-40b0-a294-54b7e3f51318/datastream/OBJ/view