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Signal envelope processing

  • US 9,362,875 B2
  • Filed: 07/02/2014
  • Issued: 06/07/2016
  • Est. Priority Date: 07/05/2013
  • Status: Active Grant
First Claim
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1. An envelope detection circuit comprising:

  • absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples; and

    an envelope tracker configured to maintain an envelope output value and to compare the first value to the current envelope output value and modify the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics;

    wherein the absolute value circuitry comprises a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and is configured to output said first value based on the magnitudes of the samples received at the first input and the samples received at the second input.

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