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Method and apparatus for intelligent dual-tone multi-frequency (DTMF) decoding and identification

  • US 10,264,333 B1
  • Filed: 11/17/2017
  • Issued: 04/16/2019
  • Est. Priority Date: 11/17/2017
  • Status: Active Grant
First Claim
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1. An apparatus configured to identify a characteristic of information conveyed by dual-tone multi-frequency (DTMF) symbols, the apparatus comprising:

  • communication circuitry configured to receive an audio input;

    a DTMF decoder coupled to the communication circuitry that is configured to decode DTMF symbols included in the audio input received from the communication circuitry and configured to transfer the decoded DTMF symbols to a buffer to be stored;

    a timer coupled to the DTMF decoder and the buffer;

    a volume accumulator coupled to the communication circuitry and the timer and configured to determine whether the audio input includes audio with volume above a predetermined threshold and configured to reset the timer when the audio input includes audio with volume above the predetermined threshold;

    the buffer configured to receive an instruction from the timer or the volume accumulator to transfer each stored DTMF symbol to a filter; and

    the filter configured to identify a characteristic of information conveyed by the DTMF symbols and further configured to send the identified characteristic information to an output device.

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