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Digital crossover based on TAS5548's internal DSP - is it real?

Yuri Simanovich
Prodigy 80 points
Other Parts Discussed in Thread: TAS5558, TAS5548

Hi, people, we're are trying to build fully digital active 3-way speaker system, so we'd like to develop fully digital crossover to split digital audio signal into three bands and then amplify them separately wint TI's PWM amplifiers.
So, is it real to use TAS5548 (or TAS5558) internal DSP?

Thanks,
Yuri, Engineer

  • 0
    TI__Guru 57800 points

    Hi, Yuri,

    I think you will be able to develop the band splitting with the audio processor of the TAS5558. Please refer to section 7.4.9 of the TAS5558 Datasheet to find more information of the Audio processing features of the device.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0
    TI__Mastermind 34775 points

    Hi Yuri,

    Yes you can use the BQs  for each channels to program high pass filters, low pass filters and band pass filter responses. These BQs are shown on page 29 along with their coefficient registers. Page 35 has info on the Biquad structure, which uses 5.23 format. The 5.23 format conversion for the Biquad coefficients from linear is explained on page 32 and 33.

    Let me know if you have more questions or need more detailed guidance.

  • 0 in reply to Damian Lewis
    TI__Mastermind 34775 points

    I'm referencing the TAS5558 datasheet above.

  • 0 in reply to Damian Lewis
    Prodigy 80 points
    Hi, Damian,

    thank you for your response. Can TruePath Console GUI software make more easy my development process?
  • 0 in reply to Yuri Simanovich
    TI__Mastermind 34775 points

    Hi Yuri,

    Yes the TruePath Console GUI is a good start. You will need our EVM as well to help develop the register configurations using the GUI. This would be a good way to get you started. What HW do you have currently?

  • 0 in reply to Damian Lewis
    Prodigy 80 points

    Hi Damian,
    currently we're just evaluating hardware which we could use to build the stereo audio set that will meet our concept.
    The concept is th following:
    - a base block that has several S-PDIF inputs and some analog audio inputs (analog signals will be A/D converted on the fly and RIAA correction will be implemented as needed, because that analog inputs we plan to use as PHONO inputs for legacy vinyl turntables). Then digital signals will go to audio DSP for volume and bass/treble correction. Then we plan to send it wirelessly to active speakers.
    - active speakers will consist of wireless receiver, digital crossover and digital power amplifier.
    And we glad that TI offers every component we need, so we can find all we want in one place.
    At the moment we evaluate a possibility to incorporate a Blueray transport and HDD to keep digital audio inside the base block, so the question is if TI has any chips to build decoder capable to decode (and downmix 5.1 and 7.1 to stereo) FLAC, MP3 and so on.

    Regards,
    Yuri.