SLAA936A September   2020  – March 2021 TAS2563

 

  1.   Trademarks
  2. 1Introduction
  3. 2Quick Tuning Procedure
    1. 2.1  Initialize Tuning
    2. 2.2  Flatten Protection
    3. 2.3  Frequency Response Matching
    4. 2.4  Microphone Setup
    5. 2.5  Record Reference Device Response
    6. 2.6  Set Input Gain
    7. 2.7  Equalizer
    8. 2.8  Dynamic Range Compression (DRC)
    9. 2.9  Smart Amp Protection
    10. 2.10 Speaker Protection Verification
    11. 2.11 System Signal Chain
    12. 2.12 Tuning Elements
      1. 2.12.1 Input Gain
      2. 2.12.2 Equalizer
        1. 2.12.2.1 Biquads
        2. 2.12.2.2 Dynamic EQ
      3. 2.12.3 Dynamic Range Control
        1. 2.12.3.1 2-band DRC
        2. 2.12.3.2 DRC Test
      4. 2.12.4 Smart Amp Speaker Protection
    13. 2.13 PDM MIC
  4. 3Related Documentation
  5. 4Revision History

2.12.2.2 Dynamic EQ

Dynamic EQ (DEQ) helps to reduce distortion due to rocking mode/rub-and-buzz, which may occur at a particular frequency by compressing loud signals at that frequency.

The dynamic EQ uses a 128-sample look-ahead, and provides controls for frequency points where dynamic equalization can be activated based on input signal level. Controls for the DEQ include:

  • Center frequency(Hz): Sets the center frequency of the DEQ Compressor.
  • Q: Sets the band Q-factor to narrow the bandwidth DEQ compression region
  • Peak Gain Threshold (dB): Gain Threshold of the limiter below which the gain compressor will be enabled.
  • Peak Gain Compression: Compression Ratio in the compression region.
  • Peak Limit(dB): Sets the limit of the output signal at the center frequency.
  • Peak Alpha (ms): Release time of the DEQ
GUID-BE22022F-317F-4A8B-B9E6-FD567B94FBE3-low.pngFigure 2-16 Dynamic EQ Example (Single Band DEQ at 2 kHz)