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

2.4 Microphone Setup

For the next step, set up the microphone for mono input and open the audio analysis software to a real- time fast-Fourier transform (FFT) analyzer tool where the input to the FFT data is the microphone data. Arrange the microphone orientation directly toward the speaker port of the reference device with a distance of approximately 10 cm. Play the loudest pink noise track on the reference device and adjust the microphone gain so that there is no clipping or overdrive on the microphone system input. This level can usually be seen in the sound devices recording window on a Windows® operating system (OS).

Note the importance of retaining the same system volume, microphone distance, and microphone gain for all comparison testing. The absolute level of the gain or input signal is not important, but it is important to stay consistent. If a microphone audio reference device is available, the microphone can be calibrated using this, but it is not necessary when only making a device comparison measurement.