Waveform measuring apparatus wherein the peak-to-peak amplitude is measured
First Claim
1. A waveform measuring apparatus comprising:
- a first digital filter that removes a large-amplitude changing component from an input signal and outputs a resultant output signal with a remaining small-amplitude noise component left therein;
a second digital filter that removes the small-amplitude noise component from the input signal and outputs a resultant output signal with a remaining large-amplitude changing component left therein;
a window generating a section that inputs the output signal of the first digital signal and that generates a window which indicates a position of an edge portion of said signal of the second digital filter; and
a ringing measurement section that extracts, from the output signal of the first digital filter, a portion indicated by the window generated by the window generating section, and that measures at least a peak-to-peak amplitude of an extracted waveform.
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Abstract
A waveform measuring apparatus includes: a digital filter for removing a large-amplitude changing component from an input signal and for outputting a resultant output signal with a small-amplitude noise component left therein; a window generating section for receiving a differential signal between this input signal and the resultant output signal of the digital filter and for generating a window indicating a position of an edge portion of the differential signal; and a ringing measurement section for extracting, from the resultant output signal of the digital filter, a portion of waveform which is indicated by the window generated by the window generating section and for measuring at least a peak-to-peak amplitude of the portion of waveform.
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Citations
4 Claims
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1. A waveform measuring apparatus comprising:
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a first digital filter that removes a large-amplitude changing component from an input signal and outputs a resultant output signal with a remaining small-amplitude noise component left therein; a second digital filter that removes the small-amplitude noise component from the input signal and outputs a resultant output signal with a remaining large-amplitude changing component left therein; a window generating a section that inputs the output signal of the first digital signal and that generates a window which indicates a position of an edge portion of said signal of the second digital filter; and a ringing measurement section that extracts, from the output signal of the first digital filter, a portion indicated by the window generated by the window generating section, and that measures at least a peak-to-peak amplitude of an extracted waveform. - View Dependent Claims (2, 3)
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4. A program for causing an internal computer of a measuring apparatus for measuring a waveform of a signal to function as:
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means for extracting a small-amplitude noise component from an input signal inputted by input means of the measuring apparatus; means for removing the small-amplitude noise component from the input signal; means for generating a window, which indicates a position of an edge portion of a signal wherein the small-amplitude noise component has been removed; and means for extracting a portion, which is indicated by the window, from the small-amplitude noise component extracted from the signal to be processed, and for measuring at least a peak-to-peak amplitude of the extracted waveform.
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Specification