By Chris Harrison & Scott Hudson (Carnegie Mellon University)
Comments: Jill Greczek
Summary:
This paper discusses the idea of using an acoustic based input technology that can travel with the user. It will be implemented by Scrath Input with its goal to transfer common surfaces, such as tables or walls, into an input device.
Scratch Input
It consists of a small sensor that can detect the sound of "scratching with a fingernail" on a surface area. Once the signal is received, it maps to a list of gestures. The goal is to implant Scratch Input into a mobile device to enable any solid surface that it is placed on to become an input device. Due to it only having one sensor and one microphone, it can detect position of an object. Examples of gestures include scrolling, seeking, and volume control.
Evaluation
Fifteen participants were shown how to use the sensor and had a cellphone placed on top of the sensor. Then each participant was positioned with a laptop and were given six gestures to exercise. Overall, 89.5 % were able to perform the gestures consistently and accurately.
Discussion:
At first glance, I could not see any benefit in scratching your finger as the input device. But, after reading the cellphone example and the study, it could be useful to have this type of capability. I could be sitting here, typing away, and not have to be completely interrupted to silence a call. This technology is interesting and due to its budget friendly implementation, I am curious to see if this will become a part of mobile devices in the near future.
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