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System and method for audio sample rate conversion

  • US 9,052,991 B2
  • Filed: 11/27/2012
  • Issued: 06/09/2015
  • Est. Priority Date: 11/27/2012
  • Status: Expired due to Fees
First Claim
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1. A method for audio sample rate conversion, comprising:

  • receiving an audio signal at a first rate, the audio signal having a fundamental frequency;

    determining absolute derivatives of the audio signal at the first rate including a first order derivative and at least one derivative higher than a first order derivative;

    generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative;

    analyzing the combined absolute derivative to locate a local minimum of the combined absolute derivative;

    selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and

    altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate.

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