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Method and apparatus for providing compressed and expanded displays on a digital oscilloscope

  • US 5,039,937 A
  • Filed: 05/11/1990
  • Issued: 08/13/1991
  • Est. Priority Date: 05/11/1990
  • Status: Expired due to Fees
First Claim
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1. Digital oscilloscope apparatus comprising:

  • (a) a waveform memory;

    (b) means for sampling a time varying signal to produce digital data corresponding to the waveform of the signal and storing the data in the waveform memory;

    (c) display means for receiving digital data to provide a visual display of the waveform corresponding to the data on a display screen;

    (d) means for determining for each of a plurality of sections of the data in the waveform memory, each section correponding to data taken during a selected period of time, whether the data in each section includes a datum falling within each of a selected number of magnitude ranges and for providing control data to the display means such that the display means displays columns of pixels for each section of waveform data with pixels being illuminated in each column which correspond to those ranges for which a datum fell within that range, to form an abstracted scroll bar waveform displayed on the display screen.

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