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dc.contributor.authorSong, Qunen
dc.contributor.authorGu, Chaojieen
dc.contributor.authorTan, Ruien
dc.identifier.citationSong, Q., Gu, C., & Tan, R. (2018). Deep room recognition using inaudible echos. Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT), 2(3), 135-. doi:10.1145/3264945en
dc.description.abstractRecent years have seen the increasing need of location awareness by mobile applications. This paper presents a room-level indoor localization approach based on the measured room’s echos in response to a two-millisecond single-tone inaudible chirp emitted by a smartphone’s loudspeaker. Different from other acoustics-based room recognition systems that record full-spectrum audio for up to ten seconds, our approach records audio in a narrow inaudible band for 0.1 seconds only to preserve the user’s privacy. However, the short-time and narrowband audio signal carries limited information about the room’s characteristics, presenting challenges to accurate room recognition. This paper applies deep learning to effectively capture the subtle fingerprints in the rooms’ acoustic responses. Our extensive experiments show that a two-layer convolutional neural network fed with the spectrogram of the inaudible echos achieve the best performance, compared with alternative designs using other raw data formats and deep models. Based on this result, we design a RoomRecognize cloud service and its mobile client library that enable the mobile application developers to readily implement the room recognition functionality without resorting to any existing infrastructures and add-on hardware. Extensive evaluation shows that RoomRecognize achieves 99.7%, 97.7%, 99%, and 89% accuracy in differentiating 22 and 50 residential/office rooms, 19 spots in a quiet museum, and 15 spots in a crowded museum, respectively. Compared with the state-of-the-art approaches based on support vector machine, RoomRecognize significantly improves the Pareto frontier of recognition accuracy versus robustness against interfering sounds (e.g., ambient music).en
dc.format.extent28 p.en
dc.rights© 2018 Association for Computing Machinery (ACM). All rights reserved. This paper was published in Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT) and is made available with permission of Association for Computing Machinery (ACM).en
dc.subjectRoom Recognitionen
dc.subjectEngineering::Computer science and engineeringen
dc.titleDeep room recognition using inaudible echosen
dc.typeConference Paperen
dc.contributor.schoolSchool of Computer Science and Engineeringen
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en
dc.contributor.conferenceProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)en
dc.contributor.researchEnergy Research Institute @NTUen
dc.description.versionAccepted versionen
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