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TAS2557: Speaker loudness quickly drops and goes back up

Gui Borba
Prodigy 180 points
Part Number: TAS2557


Hello,

I have been performing some speaker testing with the TAS2557EVM and experienced a case where the speaker loudness would quickly drop and then go up again (but not as loud as the start) and settle. In this particular test, I was playing single frequency sounds, but noticed it for any sound. It happened every time after stopping a sound and starting a new sound. After power cycling the EVM, the problem went away. Do you have any idea what I may have experienced and how to avoid it?

Thanks,

Gui

  • 0
    Guru 140200 points

    Hi Gui,

    do you overload the chip? Becomes the "INT_OC" flag or the "INT_OT" flag set?

    Take care, when playing single frequency sounds with constant high amplitude. Such signals are not part of natural music and can overload the audio amplifier chip or the loudspeaker.

    Kai

  • 0
    TI__Mastermind 20085 points
    Hi Gui,

    Could you provide us further details when your problem is happening?

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Prodigy 180 points

    Hi Kai and Jose,

    I power cycled before checking those flags and have not been able to replicate the issue yet, but I am being more careful playing single frequencies. I do not have a good understanding of the DSP protection algorithm - does it not work for single tones? Is it better to play a single tone with oscillating amplitude?

    The purpose of my testing was to determine if different speakers can meet a loudness requirement at 1m across frequencies. I characterized several speakers and have been running a single tone, slow frequency sweep and only ran into that issue one time. I will check the "INT_OC" flag or the "INT_OT" if it happens again.

    Thanks,

    Gui

  • 0 in reply to Gui Borba
    Guru 140200 points

    Hi Gui,

    single frequencies are not problematic by itself, but it's easier to overload the speaker when applying a single frequency, especially if the frequency and amplitude is high.

    Just keep an eye on the "INT_OC" flag and the "INT_OT" flag to see whether you overload the TAS2557.

    Kai

  • 0 in reply to Gui Borba
    TI__Mastermind 20085 points
    Hi Gui,

    DSP protection algorithm should work with any frequency. It is quite difficult to determine the problem without extra information as you can't replicate it.
    You can review the flags and the amplifier signals in order to determinate a possible cause when the problem shows up again.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer