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Method for digital interpolation

  • US 5,717,618 A
  • Filed: 07/31/1995
  • Issued: 02/10/1998
  • Est. Priority Date: 08/08/1994
  • Status: Expired due to Term
First Claim
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1. A method for digital interpolation of signals comprising the steps of:

  • receiving a digital signal input value sequence x(k) corresponding to an analog signal sampled at a predetermined frequency;

    locking delayed input values of said digital sequence x(k) to a first clock signal, said first clock signal having an interpolating instant and a time grid;

    determining weighting factors by means of an impulse response in a time domain with a transfer function in a frequency domain having an attenuation characteristic which, with respect to stop bands, is limited to alias regions located at frequency multiples of said first clock signal;

    multiplying said locked delayed input values by said corresponding weighting factors;

    determining a time-difference value as a function of said interpolating instant and said time grid;

    adding said multiplied values wherein said values depend on said time-difference value to produce a second digital signal sequence y(d) at a second sampling rate;

    wherein each of said alias regions is assigned at least two zeros of said transfer function in the frequency domain, said at least two zeros in each alias region lying side by side of if two zeros lie on top of one another as a second-order zero, at least one of said alias regions assigned at least one further zero of said transfer function;

    wherein said impulse response is dependent on said time difference value.

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