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

2.6 Set Input Gain

Now point the microphone toward the target device speaker port at the exact same distance and keep the same gain as before. Play the –48-dB pink noise through the PC audio player, EVM, and target speaker. Use the audio analysis software to overlay the –48-dB pink noise response of the reference device onto the new target device response. Adjust the input gain of the target device by using the input gain control in PPC3 until the average level of the two plots match as much as possible. This matching does not have to be accurate. Sometimes, the frequency response shape of the two devices is quite different, which makes matching the two curves across the frequency difficult. The point of this step is to only match the general sound level across the entire band, not at all the individual frequency regions.