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TAS5756m (PurePath Console) message

SEUNGSOO NAM
Prodigy 50 points
Other Parts Discussed in Thread: TAS5756M

Dear Sirs,

My Purepath console shows me the red " overflow" message in the audio data status place.

Whenever the output of TAS5756m nears the maximum, the green "OK" and the red " overflow" message alternates each other.

Could someone tell me the meaning and how to deal with it?

Thank you in advance.

Seungsoo Nam

  • 0
    TI__Mastermind 34665 points

    Hi Seungsoo,

    I means that the digital signal is clipping in the data processing path. It's not an issue if you're meeting the THD performance required at max input level. Here is a couple of ways to deal with this.

    1. Reduce the max input level and use DAC digital gain to achieve the same max power level.
    2. Reduce the gain in one or more of your PEQ setting (BQ data path only has 12dB of headroom) then use the DRC offset to compensate for the reduced gain.

    Which HF are you using for TAS5756M?

  • 0 in reply to Damian Lewis
    Prodigy 50 points
    Hello Damian.
    Thank you for your answer.
    I am using HF7.
    I am not using any plus gain in my PEQ setting but the input of the TAS5756m has some boost ( around 24dB ~ 30 dB I guess in some frequency range)
    So I have tried to reduce the input gain upto -21dB but still has the issue.
    When the issue occurs, I can hear some annoying distortion(it's like a fast vibrato around 100 ~ 300Hz resulted in by 20 ~ 40 Hz input).
    Can I use the DRC to prevent the issue from occuring?
    What if I cannot achieve final output power because to much gain reduction in input? The volume control looks like to have only 24dB gain maximum.

    Regards,
    Seungsoo Nam
  • 0 in reply to SEUNGSOO NAM
    Prodigy 50 points
    Hello Damian.
    I forgot counting the -15dB gain above, so overall the boost must be around 9 ~ 15dBFs before TAS5756m.
    I have another question, when you mentioned the max input level, did you mean the max input level for TAS5756m as it is?
    Or the max input level for the DAC(I believe it is located next to the DRC mixer)?
    I tried the DSP bypass setting your FA gave us, and the result was maximum 13.5dBV at TAS5756m output.
    From this , I thought there was no overflow at input of TAS5756m.

    Regards,
    Seungsoo Nam
  • 0 in reply to SEUNGSOO NAM
    TI__Mastermind 34665 points

    Hi Seungsoo,

    The DRC can only help if the clipping occurs after the DRC, not before. There's several ways to gain the signal, so I doubt you wouldn't be able to acheive the power level required or 0dBFs output. The max input level I'm referring to is before TAS5756M. It shouldn't exceed 0dBFs. The key is to identify where the clipping is occuring in the data path. The DSP bypass setting is a good start. When you used the DSP bypass what was the DAC volume setting page 0 register 0x3d and 0x3e? It should be 0x30 = 0dB to get true input signal level. Also there shouldn't be significant clipping/distortion at the output (THD+N).

    What's your PVDD voltage and output load? If you're still having issues getting the performance, please ask the TI FAE to setup a call with me to help you debug this issue.

  • 0 in reply to Damian Lewis
    Prodigy 50 points

    Hello Damian.

    The overflow issue no longer exits thanks to your advice.

    I reduced the input.

    Thank you.

    Regards,

    Seungsoo Nam