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PP-SALB2-EVM: How to acquire raw laser input signal and raw VI-data

Kim Therkelsen
Prodigy 155 points
Part Number: PP-SALB2-EVM
Other Parts Discussed in Thread: TAS2770EVM, , TAS2557, TAS2557EVM, TAS2770, TAS2552, TAS2562, TAS2559

We have a TAS2770EVM which we use as an USB soundcard to read V/I-sensing signals into a PC. We need to get laser input signal too in order to measure speaker membrane excursion. We have a Keyence laser (LK-H080 + LK-G5001P) and would like to use this together with the TAS2770EVM. Can you tell us what additional hardware we need?

We need the following:
1. A setup which acts as a single USB soundcard (preferably ASIO) and can stream audio out and voltage, current and laser in (i.e. the same as the TAS2770EVM but with laser input)
2. The laser signal should include DC (i.e. the laser signal should not be high-pass filtered since we need to monitor the rest position of the speaker membrane)

We have been looking at the PP-SALB2-EVM but are unsure whether this can fulfill our needs.

  • 0
    TI__Guru* 84915 points

    Hi, Kim,

    Welcome to E2E and thank you for your interest in our products!

    The laser signal can be taken by the PP-SALB2-EVM as you correctly mentioned. Accordingly to the User's Guide, the excursion data is converted to an electrical signal 10V / mm.

    For details about the PP-SALB2-EVM, you can take a look at this thread:

    https://e2e.ti.com/support/audio/f/6/p/893084/3302352

    Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    I have looked at your links and at SmartAmp Learning Board 2 User's Guide (Rev. A)

    as well as TAS2557/59 EVM User’s Guides.

    Unfortunately, it is still not clear to me how to get the raw IV-data AND raw laser signal into my PC. If I connect a TAS2557EVM, I can connect the board to my PC using USB. Then the TAS2557EVM shows up as an ASIO card in the "TI USB Audio Device Control Panel"?

    When I record data from the TI USB soundcard, channel 0 is current, channel 1 is voltage, and channel 2 is laser? How do I configure this?

    Best regards,

    Kim Therkelsen

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    Sorry for  my late response, I missed your response on my notifications.

    Just to confirm, do you try to take this laser data with the TAS2770EVM? I think this tool is not compatible with this EVM (at least not for now). So, you would need to use some of the EVMs we recommend in the User's Guide.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    We simply want some hardware that can record voltage, current, and displacement (i.e. laser) simultaneously. And we want it as a digital audio stream that we can process/record on our PC. As an example, TAS2770EVM can output voltage and current over USB but not laser. I.e. TAS2770EVM is not sufficient for our needs. Do you have any combination of hardware/EVM boards that allows us to record voltage, current, and laser digitally?

    Best regards,

    Kim Therkelsen

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    In case of the TAS2770, I think it cannot process or record a displacement or excursion. However, I would recommend to take a look at the devices mentioned in the SmartAmp Learning Board 2 User's Guide (TAS2562, TAS2559, TAS2557 and TAS2552). These devices have the excursion measurement function in PPC3. So, you can use it to have the details about the membrane displacement.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    You are not really answering our questions. If you look at our questions and replies, you will see that we have already looked in the user guides for the boards but have not found a clear answer, as it is not fully described in the user guides how the signals are entering the PC. Can you tell me the exact user guide and page, I should look at?

    I think the questions is fairly simple but perhaps you do not know about digital audio streams and USB in relation to your boards?

    Is it possible, that you could ask an engineer?

    Or perhaps one of your other colleagues knows this?

    Best regards,

    Kim Therkelsen

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    In order to understand how to use the EVMs, you would need to request access to PPC3 and the correct plug in that controls the specific EVM you are using. PPC3 is the tool that we use to configure the device registers. In addition, for some products, it includes some features like the excursion data analysis, which could be useful for you in this case. This is the only feature that we have to analyze the membrane displacement.

    The EVM is also recognized as recording and playback device. You can use additional software like Audacity in order to take the data from the EVM or even play some audio. In case of voltage and current measurement, you may even use a audio recorder software in order to analyze the data that the EVM sends with the IV sense function.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    As I explained, we are using TAS2770EVM as a recording and playback device today - we just need laser input as well. I.e. so that we can use for instance Audacity to record voltage, current, and displacement. Three data input channels.

    If we buy a SmartAmp Learning board 2 and a TAS2559 EVM, will we be able to record, in Audacity for instance, voltage, current, displacement, and microphone data? I.e four raw data input channels?

    Best regards,

    Kim Therkelsen

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    Unfortunately, the EVMs don't have the capability to send all the data in multiple channels. PPC3 has the option to configure them in pairs (Voltage/current, Temperature/Excursion and Digital in / Digital out). But they cannot be used all together.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    Does that mean none of your EVMs can record more than two channels simultaneously (I2S limitation perhaps)?

    I.e. I can record temperature and excursion or voltage and current, but not voltage, current and excursion?

    Can I choose to record excursion and current simultaneously?

    Best regards,

    Kim

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    The devices are capable to handle different data through TDM mode. So, many of the slots can be configured to send data such I/V sense, VBAT Time, Die Temp, Gain Time, etc. However, it is not possible to send some combinations. Basically, you may send the VBAT Time, Die Temperature, Gain Time and additional slots for one of the following combinations:

    - I/V Sense
    - Temperature/Excursion
    - Data In / Data Out

    Best regards,
    Luis Fernando Rodríguez S.