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Analog reconstruction circuit and bar code reading apparatus employing same

  • US 5,294,783 A
  • Filed: 01/10/1992
  • Issued: 03/15/1994
  • Est. Priority Date: 01/10/1992
  • Status: Expired due to Term
First Claim
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1. A reconstruction circuit that accepts as input a sampled analog signal and produces a continuous piecewise output signal, comprising:

  • input means for periodically accepting samples of said analog signal;

    first storage means, coupled to said input means, for holding a first sample, said first sample being taken from said analog signal;

    second storage means for holding a second sample;

    difference amplifier means, coupled to said first and said second storage means, having an output that is responsive to the difference of the amplitudes of said first sample and said second sample;

    integrator means for producing an output signal that changes at a rate that is responsive to said difference amplifier means; and

    feedback means coupled to said integrator means and said second storage means for bringing the amplitude of the signal that is stored in said second storage means substantially to the amplitude of said first sample in said first storage means when said first storage means is ready to accept a sample from said input means.

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