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Max number of PurePath devices

DSPedro
Prodigy 205 points
Other Parts Discussed in Thread: CC2541, CC2543

I am interested in using a PurePath chip, but was wondering how many I could use without an issue? The setup will be one master to one slave running mono audio. Can I have multiple sets of masters and slaves running in the same area without issues? Is there a maximum number I can have? For example, I have 1 master and 1 slave for each channel of 7.1 surround and the respective speaker, so there would be 8 total sets of PurePath connections in one area.

  • 0
    TI__Mastermind 21125 points

    Hi Pedro, 

    It will depend a little on the configuration. Too give you some of the basic, the 2.4 GHz frequency bands is split into 18 channels. Every PPW network (master+slave combination in your scenario) use 4 active channels and one trial channel (every fifth transmission is round-robined through the non-active channels). Without taking anything else into account this would give a limit at around 3-4 networks. 

    In your scenario however, why not have multiple slaves per master? Each master can support two channels /two slaves using uncompressed PCM16/PCME24 format or four channels/four slaves using the slightly lossy (but close to imperceptible) SLAC format?

    If the master are in proximity to some of the speakers (center) can these be wired?

    Regards, 
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 205 points

    Kjetil,

    Thanks for the response. Unfortunately my idea would not work with multiple slaves per master. Ideally I want to maximize the number of 16/24bit 48 kHz audio networks in one area with a 1 transmitter to 1 receiver configuration. Are there other TI products that could accomplish this? Something like an RF transceiver with a comparable data rate?

  • 0 in reply to DSPedro
    TI__Mastermind 21125 points

    Hi Pedro, 

    If your masters are in very close proximity you could look at timeslot aligning them (See User Guide section 2.4.6 http://www.ti.com/lit/ug/swru250l/swru250l.pdf) 

    In addition you can play with the "user RF channels" so that networks are not overlapping (put 1/2 in the upper band and the other 1/2 in the lower band or have one network at 1,4,7,10,13,16 the next at 1,5,8 etc). 

    If this will allow you to do a full 7.1 system in a reliable way is still not give and have to be tested for you to make the final call on the performance. Good thing with this scenario is that the range requirement are in-room which will help. 

    There are some RF transceivers, but they are cap'ed at 500 kbps. Some generic SoC's have 2 Mbit modes that could be used, but the entire RF protocol wil then be up to you (CC2543 and CC2541)

    Regards, 
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 205 points

    Kjetil,

    In your first post you said I could get 3-4 networks in one area. Is this without using techniques like timeslot alignment? 

    Thanks,

    Pedro

  • 0 in reply to DSPedro
    TI__Mastermind 21125 points

    Hi Pedro, 

    Yes, have a look at this video for a demonstration:
    http://focus.ti.com/general/docs/video/Portal.tsp?lang=en&entryid=0_nnh06yxq

    Regards, 
    Kjetil