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Enhanced delta modulation encoder

  • US 4,509,037 A
  • Filed: 12/01/1982
  • Issued: 04/02/1985
  • Est. Priority Date: 06/12/1981
  • Status: Expired due to Fees
First Claim
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1. An analog-to-digital encoder for converting an analog input signal to a digital output, comprising:

  • first means for receiving the analog input signal and for generating an analog dither signal;

    second means, operatively connected to said first means, for receiving the analog dither signal and for generating a flattened analog signal, said second means having more than 180°

    of phase lag at certain frequencies, said second means including means for reducing the phase lag below 180°

    ;

    third means, operatively connected to said second means, for receiving the flattened analog signal and for generating the digital output; and

    fourth means, operatively connected to said third means and to said first means, for feeding back the digital output to said first means by generating an internal analog signal and providing the internal analog signal to said first means, said first means adding the analog input signal and internal analog signal to obtain the analog dither signal.

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