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Error correction for DTMF corruption on uplink

  • US 8,233,951 B2
  • Filed: 01/25/2010
  • Issued: 07/31/2012
  • Est. Priority Date: 01/25/2010
  • Status: Active Grant
First Claim
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1. A computer-implemented method of receiving commands during an in-progress call over a voice channel, comprising:

  • accessing tone description data for a group of feature codes, each feature code of the group respectively defined by a start delimiter tone, a stop delimiter tone, and a pre-determined number of informational tones;

    receiving voice band signals over the voice channel established for the in-progress voice call between a mobile device and a terminating entity;

    identifying, in the received voice band signals, a received delimiter tone;

    identifying at least one received informational tone but fewer than the pre-determined number of informational tones when one or more of the at least two informational tones is not detected in the received voice band signals;

    determining a feature code from the group of feature codes based on the received delimiter tone and the received informational tones; and

    outputting the determined feature code.

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