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body-wired headphones?

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  • Scott Hill
    here is your Xmas story! Are body-wired headphones ahead of the e- Scott jacket? Merry Xmas! Scott Hill Copenhagen Invention: Body-wired headphones 15:40 27
    Message 1 of 1 , Dec 19, 2006
      here is your Xmas story! Are body-wired headphones ahead of the e-
      Scott jacket? Merry Xmas!

      Scott Hill
      Copenhagen

      Invention: Body-wired headphones
      15:40 27 November 2006
      NewScientist.com news service
      Barry Fox

      Body-wired headphones
      Sony's Tokyo research lab has found a way to connect headphones to
      portable music and video players without the need for fiddly wiring.
      They simply feed an audio signal straight through the listener's
      body.

      Existing wireless headphones use Bluetooth radio, but this means
      pairing two devices beforehand and is prone to interference from
      other equipment. Another approach – infra-red – relies on line-of-
      sight, which is rarely practical.

      The new system uses the listener's body as a capacitor that carries
      a tiny electrostatic charge. A music or video player sends a
      fluctuating signal to a conductive cloth pad – such as a wrist band –
      and this slightly charges the wearer's body. A pair of conductive
      ear pads in the headphones pick-up the signal and rapidly convert it
      back into sound.

      Just a few millionths of an amp flow through the wearer's body, so
      there should be no nasty tingling effect. To convert the small
      charge into good quality audio, Sony uses a high frequency signal,
      which is digitally switched to carry data at 48 kilobytes per
      second. This is enough to deliver good quality, body-rocking stereo,
      the company says.
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