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Digitally controlled electronic function generator

  • US 4,583,188 A
  • Filed: 03/11/1983
  • Issued: 04/15/1986
  • Est. Priority Date: 03/11/1983
  • Status: Expired due to Fees
First Claim
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1. A method for generating an analog output signal in response to a digital input signal in the form of input digital words having values in a specified range, the analog output signal being a non-linear function of the digital input, comprising the steps of:

  • (a) approximating the non-linear function by dividing the range into a plurality of intervals, and approximating the function in each interval by a linear segment having an analog step value comprising the value of the linear segment at the beginning of each interval and an analog slope value comprising the rate of change of the linear segment over the interval;

    (b) determining the interval for the digital input signal;

    (c) generating the analog step value for the interval from the digital input signal;

    (d) determining the analog slope value for the interval from the digital input signal;

    (e) converting the slope value to an analog form slope signal;

    (f) operating a multiplying digital to analog converter connected to receive as inputs the digital input signal, and the analog form slope signal thereby generating an incremental value in the form of an analog signal; and

    (g) adding the step value and the analog incremental value to form the analog output signal.

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