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Cellular phone with high-quality sound reproduction capability

  • US 6,819,939 B2
  • Filed: 03/15/2002
  • Issued: 11/16/2004
  • Est. Priority Date: 03/21/2001
  • Status: Expired due to Fees
First Claim
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1. A cellular phone comprising a speaker for making sound and a microphone for catching sound, wherein:

  • the speaker and the microphone are implemented by a first signal-vibration transducer and a second signal-vibration transducer that are functionally equivalent, and the first signal-vibration transducer functions as the speaker and the second signal-vibration transducer functions as the microphone when the cellular phone is used for conversation, and the first signal-vibration transducer and the second signal-vibration transducer function in cooperation as stereo speakers when the cellular phone is used for sound reproduction.

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