The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Similarity Search in High Dimensions via Hashing
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Synchronous gestures for multiple persons and computers
Proceedings of the 16th annual ACM symposium on User interface software and technology
The Horus WLAN location determination system
Proceedings of the 3rd international conference on Mobile systems, applications, and services
Accuracy characterization for metropolitan-scale Wi-Fi localization
Proceedings of the 3rd international conference on Mobile systems, applications, and services
Foundations of Multidimensional and Metric Data Structures (The Morgan Kaufmann Series in Computer Graphics and Geometric Modeling)
Nearest-Neighbor Methods in Learning and Vision: Theory and Practice (Neural Information Processing)
Nearest-Neighbor Methods in Learning and Vision: Theory and Practice (Neural Information Processing)
BeepBeep: a high accuracy acoustic ranging system using COTS mobile devices
Proceedings of the 5th international conference on Embedded networked sensor systems
Near-optimal hashing algorithms for approximate nearest neighbor in high dimensions
Communications of the ACM - 50th anniversary issue: 1958 - 2008
Locality sensitive hash functions based on concomitant rank order statistics
Proceedings of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining
Acoustic Modems for Ubiquitous Computing
IEEE Pervasive Computing
Using audio in secure device pairing
International Journal of Security and Networks
Neary: conversation field detection based on similarity of auditory situation
Proceedings of the 10th workshop on Mobile Computing Systems and Applications
Shake Well Before Use: Intuitive and Secure Pairing of Mobile Devices
IEEE Transactions on Mobile Computing
SoundSense: scalable sound sensing for people-centric applications on mobile phones
Proceedings of the 7th international conference on Mobile systems, applications, and services
SurroundSense: mobile phone localization via ambience fingerprinting
Proceedings of the 15th annual international conference on Mobile computing and networking
A privacy-sensitive approach to modeling multi-person conversations
IJCAI'07 Proceedings of the 20th international joint conference on Artifical intelligence
Discrete-Time Signal Processing
Discrete-Time Signal Processing
Locality sensitive hashing: A comparison of hash function types and querying mechanisms
Pattern Recognition Letters
Towards mobile phone localization without war-driving
INFOCOM'10 Proceedings of the 29th conference on Information communications
Indoor localization without the pain
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Indoor location sensing using geo-magnetism
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
Indoor localization without infrastructure using the acoustic background spectrum
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
SpeakerSense: energy efficient unobtrusive speaker identification on mobile phones
Pervasive'11 Proceedings of the 9th international conference on Pervasive computing
Spatial co-location for device association: the connected object way
Proceedings of the 2011 international workshop on Networking and object memories for the internet of things
IEEE Transactions on Pattern Analysis and Machine Intelligence
Usability classification for spontaneous device association
Personal and Ubiquitous Computing
Virtual compass: relative positioning to sense mobile social interactions
Pervasive'10 Proceedings of the 8th international conference on Pervasive Computing
Real-time speaker identification and verification
IEEE Transactions on Audio, Speech, and Language Processing
You are facing the Mona Lisa: spot localization using PHY layer information
Proceedings of the 10th international conference on Mobile systems, applications, and services
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A list of the dynamically changing group membership of a meeting supports a variety of meeting-related activities. Effortless content sharing might be the most important application, but we can also use it to provide business card information for attendees, feed information into calendar applications to simplify scheduling of follow-up meetings, populate the membership of collaborative editing applications, mailing lists, and social networks, and perform many other tasks. We have developed a system that uses audio sensing to maintain meeting membership automatically. We choose audio since hearing the same conversation provides a human-centric notion of attending the same gathering. It takes into account walls and other sound barriers between otherwise closely situated people. It can sense participants attending remotely by teleconference. It does not require attendees to perform any explicit action when participants leave a meeting for which they should no longer have access to associated content. It works indoors and outdoors and does not require pre-populating databases with mapping information. For sensors, we require only the commonly available microphones on mobile devices. Our system exploits a new technique for matching sensed patterns of relative audio silence, or silence signatures, from mobile devices (mobile phones, tablets, laptops) to determine device co-location. A signature based on simple silence patterns rather than a detailed audio characterization reveals less information about the content of potentially private conversations and is also more robustly compared across devices that are not clock synchronized. We evaluate our method in formal indoor meetings and teleconferences and in ad hoc gatherings outdoors and in a noisy cafeteria. Across all our tests so far, our approach determines audio co-location with a worst-case accuracy of 96%, and recovery from these errors takes only a few seconds. We also describe a content sharing application supported by silence signature matching, the limitations of our approach, current status, and future plans.