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Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility

  • US 7,167,112 B2
  • Filed: 03/20/2004
  • Issued: 01/23/2007
  • Est. Priority Date: 03/21/2003
  • Status: Expired
First Claim
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1. A sample rate converter comprising:

  • a plurality of sample rate converter components, including;

    a rate estimator;

    a low pass filter, wherein an output of the rate estimator is passed through the low pass filter;

    a phase selection unit, wherein an output of the low pass filter is provided to the phase selection unit;

    a polyphase coefficient interpolator, wherein a set of interpolated polyphase filter coefficients is generated by the polyphase coefficient interpolator based upon an output of the phase selection unit;

    a convolution unit configured to convolve the interpolated polyphase filter coefficients with a corresponding sample of an input data stream;

    an input FIFO configured to receive samples of the input data stream and to provide the samples of the input data stream to the convolution unit;

    an output FIFO configured to receive samples of an output data stream from the convolution unit; and

    a FIFO management unit coupled to the input and output FIFOs and configured to provide feedback to the low pass filter;

    wherein a first portion of the components comprise hardware components; and

    wherein a second portion of the components comprise software components.

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