hp invent: DJammer (2004)
The HP DJammer portable appliance could be the next generation of MP3 players. Building on top of current MP3 players, the HP DJammer has the following two additional functionalities: a personal DJ User Interface (UI), and a live digital session with one (or more) similar HP DJammer appliance enabling listeners to create music and digitally mix in real-time together (hence the term jamming).
Various DJ UI are implemented with buttons, wheels and knobs similar to currently available MP3 players. Additional features include DJ digital turntables with sensors, such as optical to analyze the finger movement on the device, and a 3D accelerometer to tie the way the device is shaken with the speed at which the music is played.
Live digital jamming session is implemented using off-the-shelf wireless solutions such as 802.11 and Bluetooth. IP technology is used for streaming (RTP), and session management (SIP).