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TAS5828M: Using maximum EQ BQs

Maksimilians Chistyakovs
Prodigy 30 points
Part Number: TAS5828M

Tool/software:

Hello. We need as many static equalization bands as possible for our use case, so no DRC, AGL, etc is needed.

What is the maximum count of BQs that can be used in TAS5828M DSP at 48/96k 2.0?

Going by the block diagram in PPC3 in base/pro 2.0 48k there is:

12 BQs in main EQ,

1 BQ in low level EQ in DPEQ, with sense EQ set to 0 so only the low level path is always active,

4 BQs in DRC mid band, with high band and low band muted, so only the mid band is always active.

2 BQs in Post EQ1

2 BQs in Post EQ2

So 21 static BQs, is that correct?

At 96k a lot of these are not available in PPC3, but the registers are still there as per https://www.ti.com/lit/pdf/SLUUDB4 pages 29 - 31. Is that true or is the table name a typo?
What is the behavior of the DSP if the internal processing rate is set to 96k and BQs in book 0xAA page 5 0x30 - 0x7C, page 6 0x08 - 0x54, etc (DPEQ, DRC) get written?

What is the maximum count of BQs that can be used at 96k?
Is there a processflow / hybridflow with pure EQ or FIR?

  • 0
    TI__Mastermind 18240 points

    Hello,

    Thanks for reaching out. I received your inquiry and will be able to provide feedback within a day.

    Regards,
    Sydney Northcutt

  • 0
    TI__Mastermind 20401 points

    hi Chris

    1.the EQ quantity for 96k is less than 48k.

    as 96khz has no DPEQ(-1), DRC band is less(-2), no Post EQ(-4), so basically 21-7=14 BQs.

    2.the Application notes has some problem. let me check with team and modify it.

    in 96k, those blocks like DPEQ, DRC cannot be used as the processflow not support it.

    3.max count Bqs is hard to evaluate as all processflow already be fixed. not sure if removing other blocks can make eq be much more.

    no pure EQ and FIR processflow in tas5828.

    thx

    jesse

  • 0 in reply to Jesse Ji
    Prodigy 30 points

    Hi,

    Thanks for clarifying.

    When trying the Base/Pro (1.1 96k) process flow I noticed that it is using dsp in ram mode.

    Are the tools to create such a ram mode firmware public or is it something you guys can work on to provide more bands?

  • +1 in reply to Maksimilians Chistyakovs
    TI__Mastermind 20401 points

    hi Maksimilians

    the DSP do have the ram mode can be programming.

    but it was not open to customer. 

    as this chip already be RTM many years, it is hard to re-programming for it.

    thanks

    jesse