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TAS5558: Meaning of negative value(-dB) in DRC settings

Jay Yoo
Intellectual 1826 points
Part Number: TAS5558

Hi team,

I have a question about DRC setting. I know what DRC is and why to use. However I don't understand meanings of value in DRC. 

What is the meaning of negative value in threshold? If its unit is dBFS which the maximum level is 0dBFS, Why there's 24dB in threshold value? And What does that mean?

See below figure from TAS5558's DRC block

Best regards,

Jay

  • +1
    TI__Mastermind 31760 points

    Hi Jay

         The threshold value, no matter it is negative or positive, it represents the strength of the digital signals. Usually it's value is negative because we define the maximum level is 0dBFS. The reason there's a 24 dB, is that we will give input signals -24dB headroom, for the convenience of  the turning and avoid digital clipping, you can use this headroom if necessary. But we don't suggest you to set the signal beyond 0dBFS if you are not familiar with the Gain structure in our device, it may result in clipping at the output.

  • 0 in reply to Shadow He
    TI__Intellectual 1826 points

    Hi Shadow,

    I am well noted of the information, thank you!

    Jay