Alias Protection (194)

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Chapter Outline

Chapter 8, Course 196 - Alias Protection (Vibration and Shock Test Control Techniques)

  • Pyrotechnic Test Data Set Example—Alias-Protection
    • Solution #1: Sample Really Fast
    • Solution #2: Analog Anti-Alias Filters
  • Filters
    • The Basic Low-Pass-Filter Concept
    • Brick-Wall vs. Real Filters
    • How Filters Behave
  • Aliasing Analysis
    • Anti-Alias Filters … Hardware
    • Complex Filter “Construction”
    • Building a Filter
  • Group Delay
  •  “Classical” Filter Types
    • Bessel Filters
    • Butterworth Filters
    • Elliptical Filters
  • Low-Pass Filter Comparison… Spectral Domain
  • Filter Characteristic
  • Filter/Sample-Rate
  • Trade-Offs
  • Aliasing…Revisited
    • Aliasing Analysis—Assumption #1—Physical Considerations
      • Pyrotechnic Test Data Set
    • Assumption #2…Filter Cutoff Frequency
  •  Sampling Ratio Calculation
    • The fR /fCR Ratio
    • Performance of Different Filters
    • Minimum Sampling Ratios for Different Filters
    • The Aliasing Diagram—Filter/Alias Analyzer
    • Anti-Alias Filter Effect (1.61 Points/Cycle)
    • Removing Aliased Data
  • How to Tell Whether a Data Set is Aliased
    • Good and Bad (Ugly)
  • “Digital” Anti-Alias Filters
  • AC/DC Coupling
    • Why do AC Coupling?
    • AC-Coupling to Remove Offset
    • AC-Coupling Methods
    • Capacitive AC Coupling
    • Offset Subtraction … Analog
    • Offset Subtraction … “Digital”
    • Recommendation
    • The Downside of AC-Coupling
    • AC-Coupling Distortion—More Examples