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TAS5825M: Leveler, Volume Normalizer

Hanno Reimer
Intellectual 2140 points

Part Number: TAS5825M
Other Parts Discussed in Thread: PCM9211

does TAS5825M have a leveler or volume normalizer function integrated? When switching to another source there should be no step in the output volume! 

  • 0
    TI__Guru 52115 points

    Hi Hanno,

    TAS5825M does offer volume control on both channels.  Could you elaborate on the leveler or volume normalizer function integrated?

    I don't think there exists a digital block in TAS5825M that can function like the leveler or volume normalizer you mentioned.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Intellectual 375 points

    Hello Andy,

    we have the following application case:

    Tuner, analog/digital source and manual generated sound go on the PCM9211. This passes the desired I2S signal to the TAS5825M. The user should not perceive different volume levels when switching the source, but the volume level should be kept constant.

    I noticed the volume control. But I would have to measure the input level to adjust the volume.
    Are there any solutions/examples?

    Mit freundlichen Grüssen / Best Regards

     

    Simon Dahl, M.Sc.

    Entwicklung / Development

     MDT technologies GmbH

  • 0 in reply to Simon Dahl
    TI__Guru 52115 points

    Hi Simon,

    I don't have a perfect solution.  If you know the gain differences among these sources,  one thing you can do is to compensate the gain variation using the input mixer. 

    Andy

  • 0 in reply to Andy Liu (BMS)
    Intellectual 375 points

    Hello Andy,

    but do you know of any solution to measure the gain of an audio source "easily"?

    Best regards,

    Simon

  • 0 in reply to Simon Dahl
    TI__Guru 52115 points

    Hi Simon,

    In my opinion,  the most convenient way is to use some professional tool, like the Audio Precision audio analyzer we use every day in our lab.  

    If you don't have that kind of tool, I think you may have to play with the volume or input mixer in the PPC3 to find out the gain differences among these sources.

    Andy