People were really into this talk. I didn't see it, but here are Michele's notes.
Context-Aware Computing with Sound (FULL PAPER)
Anil Madhavapeddy1, David Scott2, and Richard Sharp3
1 Computer Laboratory, University of Cambridge, 2 Laboratory for Communication Engineering, University of Cambridge, 3 Intel Research, Cambridge
Audio networking
Using existing infrastructure which requires no new hardware
Bandwidth is narrow – but there is a use - localized control channel
Properties of Audio
-gives location information
fine grained control over amplitude
walls usually sound proofed (opposite of wireless going through wall)
-Humans can hear transmission
Can this be avoided?
Piggy back device/device
-Speaker and mics are ubiquitous – ready to deploy now
DTMF
On/ff keying pulse = 1 non pulse = 0
Transmitting over short distances/low-amplitude
Unobtrusive audio
Modulate data over a frequency
Roughly the amplitude of dial tone
Melodic data transmission
Context aware applications
Audio Notes
Author encodes URL that plays over speakers and picked up by devices (
Pick and drop interface – at receiving station
Telephone attachments
Integrate telephone network/data network (DTMF over the telephone)
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