×

Low-delay signal processing based on highly oversampled digital processing

  • US 7,365,669 B1
  • Filed: 03/28/2007
  • Issued: 04/29/2008
  • Est. Priority Date: 03/28/2007
  • Status: Active Grant
First Claim
Patent Images

1. A low-delay audio data processing system comprising:

  • a first converter for converting sound into an audio signal;

    a delta-sigma analog-to-digital converter for receiving the audio signal and for generating a digital sample signal at a high oversampling rate;

    a decimation filter responsive to the digital sample signal at the high oversampling rate for generating a downsampled signal;

    an audio data processor being connected to said decimation filter for processing the downsampled signal;

    an interpolation filter responsive to the processed downsampled signal for generating an upsampled signal;

    a delta-sigma digital-to-analog converter for receiving a compensated upsampled signal and for generating an analog signal;

    a second converter for converting the analog signal into a sound signal;

    an oversampling processor including a low-delay filter interconnected between said analog-to-digital converter and said digital-to-analog converter for processing the digital sample signal at the high oversampling rate with low-delay; and

    a summer connected to said oversampling processor and to the output of said interpolation filter for generating the compensated upsampled signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×