7,053,292 Device comprising a sound signal generator and method for forming a call signal
  Issued: May 30, 2006
  Filed: September 24, 2002
  U.S. Class: 84/610
Abstract:  This device enables the user to personalize the call signal (ringing) which it is called on to deliver. This personalization consists of transforming a melody which the user hums into his microphone in order to transform it into a polyphonic melody. Application: Ringing for mobile telephones.

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