Cellular telephone having improved in-band signaling for data communications over digital wireless telecommunications networks

  • US 7,221,669 B2
  • Filed: 03/06/2002
  • Issued: 05/22/2007
  • Est. Priority Date: 05/19/1997
  • Status: Expired due to Term
First Claim
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1. A cellular telephone, comprising:

  • an audio microphone for converting voice signals into electrical voice signals;

    an analog to digital converter for converting the electrical voice signals into digital voice samples;

    a voice coder for converting the digital voice samples into encoded digital voice signals;

    a transceiver that transmits the encoded digital voice signals over a digital voice channel of a wireless communications network; and

    an inband signaling modem that converts a digital bit stream into synthesized tones and outputs the synthesized tones to the voice coder, the voice coder encoding the synthesized tone in the same manner as the electrical voice signals before being transmitted over the digital voice channel.

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