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TAS5825MEVM: Distributed mode loudspeaker modeling?

Perry Brandston
Prodigy 60 points

Part Number: TAS5825MEVM
Other Parts Discussed in Thread: TAS5825M

I am using this TAS system to develop a "bending wave"/exciter based loudspeaker.  Using PPC3 the modeling options are based on a cone driver in a box.  I'm looking for help In "translating" so that I have a useful analogous model.

  • 0
    TI__Mastermind 24722 points

    Hello Perry, 

    Can you share a screen capture of what you are referencing in PPC3? 

    All the best, 

    Carolina 

  • 0 in reply to Caro Gomez
    Prodigy 60 points

    Thanks for asking!

    Perry

  • 0 in reply to Perry Brandston
    TI__Mastermind 24722 points

    Hello Perry, 

    Did you use the learning board(PP-SALB-EVM) for the characterization?

    All the best,
    Carolina 

  • 0 in reply to Caro Gomez
    Prodigy 60 points

    Hello Carolina,

    No I did not.  I was skeptical that I would get meaningful results with it, since this is a speaker without a cabinet.  Are you sure this will characterize my speaker in a useful way?  I am concerned that I will still have to provide T/S data and cabinet dimensions to proceed.  This will leave me in the same quandary.

    Thanks for your attention.  It is really appreciated.

    All the best, and more,

    Perry

  • 0 in reply to Perry Brandston
    TI__Mastermind 24722 points

    Hello Perry, 

    When you say a "speaker without a cabinet," do you mean it is just the speaker load not in a closed box?

    Can you attach a picture of your speaker?

    All the best,
    Carolina

  • 0 in reply to Caro Gomez
    Prodigy 60 points

    Hello Carolina,

    From Wikipedia: "(A) Distributed Mode Loudspeaker (DML) is a flat panel loudspeaker technology, developed by NXT, in which sound is produced by inducing uniformly distributed vibration modes in the panel through a special electro-acoustic exciter."

    With this type of loudspeaker there is no net pistonic motion, no air mass within a cabinet, and thus the Theil/Small model is meaningless. There is however a motor with a magnet, a gap and a voicecoil, as well as a suspension structure.  The suspension allows the magnet to move, if you will, and waves are induced into the flat plate due to the inertia of the massive magnet.  The waves move laterally. The model is quite different. 

    The documentation referred to on the PP-SALB-EVM page seems to indicate that this too will be asking for parameters which i can't think of a way to measure.

    If you have used the PP-SALB-EVM perhaps you see a way to use it to clear this hurdle.  In any case, thank you for your attention again.  I think no one has used a smart amp in this kind of project.

    Best,

    Perry

  • 0 in reply to Perry Brandston
    TI__Mastermind 24722 points

    Hey Perry, 

    I would probably just use closed box for the modeling, I do not believe we have anything closer from the options available. The purpose of characterizing your speaker is to operate within a "safe operating area" and not damage it. 

    However, you are still able to use the TAS5825M and there are process flows that do not require characterization. 

    All the best, 
    Carolina

  • 0 in reply to Caro Gomez
    Prodigy 60 points

    Hello Carolina,

    Thank you for looking.  I doubt my project will be the last to use a TAS smart amp with a DML, and I will continue to use the vented model to represent the real behavior and SOA of my exciters.

    Thanks for trying!

    Perry