SLAAED0 March   2024 TAS2764 , TAS2780 , TAS2781

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Measurement Methodology
  6. 3 Introduction to Noise-gate and Pop in Class-D Amplifiers
  7. 4 Causes of Pop in TAS27xx family of Class-D Amplifiers
  8. 5 Click and Pop Using TAS27xx
  9. 6 Click and Pop Measurement Technique Using AP v6.0. 2
    1. 6.1  Measurement Setup
    2. 6.2  Filter Settings
    3. 6.3  Data Capture Settings
    4. 6.4  Auto Range Settings for Pop Measurement
    5. 6.5  ASI or I2S Configurations for Pop Measurement
    6. 6.6  APx Sound Level Meter Utility
    7. 6.7  Data Acquisition
    8. 6.8  Interpreting Click and Pop Waveforms
    9. 6.9  Post Processing of AP Waveforms
    10. 6.10 A-Weighted Click and Pop Numbers
    11. 6.11 Exporting the A-Weighted Numbers
  10. 7 Noise-Gate Pop and Measurement Technique Using APx
  11. 8 Configuring TAS2764 for Improved Click and Pop Noise Performance
    1. 8.1 Explanation
  12. 9 Summary
  13. 10References

6.10 A-Weighted Click and Pop Numbers

For the click and pop measurement, only the Filtered Waveform section is important. You can discard the Averaging Mode, Averaging Time, and Averaged Data sections as these are not relevant to the click and pop measurement. Please make sure to choose A-weighting as Filter option in the window. This applies the A-Weighting filter on the Original Waveform and the resulted A-Weighted Waveform appears in the Filtered Waveform section. In Figure 6-14, zoom in around the Maximum peak level, and analyze both the original and A-weighted waveform outputs.

The original waveform is displaying a max peak level of approximately 1.4mV (similar to the capture in Measurement Recorder Window Output). At the same instance, the A-weighted filtered waveform displays a max peak level of approximately 1.1mV.

GUID-20231109-SS0I-T4TZ-J830-V9MXD58XXNSD-low.png Figure 6-14 Filter and Average Waveform Window – Zoomed Around Max. Peak Level