Streaming the same audio track in real time to two different locations - Page 3


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  1. #21
    Prolific Poster shantanu@india's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    Quote Originally Posted by John Drew View Post
    Did you consider the XBEE Pro on 900MHz. Licence free and reasonable power out.
    Less prone to interference and they are spread spectrum. A number can also be setup as a self healing system if expansion required. The packet has error checking and has addressing to a specific remote device which also responds so you know the messages got through. They are expensive but for a commercial application very practical.
    It isn't hard to make a small yagi to ensure signals get through although a simple commercial 5/8 5/8 vertical at each should be fine for line of sight at that distance.
    John
    Thank you very much John!!
    XBEE pro datasheet mentions 6.5 kms at 10kbps which should be good enough.
    60 USD is not much for a commercial application.
    What is better.....using the XBEE based comm link to click start the MP3 player on the bridge......or directly transfer the audio file to the bridge after digitization?
    Shantanu

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  3. #22
    Administrator John Drew's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    I hadn't considered the best way to do it. I imagine that the audio wouldn't need to be HIFI for the lights so maybe it might work by direct transfer but I don't really know. If I was designing it I think I would set up a remote control system at the lights that fired off the correct file on demand.
    Currently I'm modifying a standard xBee 1 to 1 firework firing system into an xBee digimesh solution. Still a bit to go. The proprietor is doing the network setup using the supplied setup software. I do the interpretation of the data. The current system works well but the network will add lots of advantages as it's complete peer to peer system and a unit hidden from the controller will be visible to others on the network and therefore receive any data addressed to it. Range will also be substantially increased over the 2.4GHz solution.
    John

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  5. #23
    Fanatical Contributor Les's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    Because the final sound is going to come from a PA, CD audio quality or stereo is not a real issue.

    Why not use a LoRA tranceiver and simply transmit 12-bit or 16-bit audio data to another LoRA and place it through a DAC. The LoRA tranceivers have a range of up to 10Km and should be sufficinet for a bit rate high enough for PA audio.
    For more example programs for Proton and Proton24 or updates, please visit: Proton WIKI or Proton Files

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  7. #24
    Junior Member david's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    I still think the simplest approach is to take a COTS Bluetooth audio transmitter/receiver pair and slap decent high gain antennas on each end of the link.
    Class 1 is 100mW or +20dBm so you would only need about 8dBi antennas to obtain a decent link. Helicals or Yagis should easily do it

    https://www.amazon.com/dp/B01H6I3YGK/ref=emc_b_5_i

    The ad states a modest range but then the antennas (which look like removable SMA types) will only be basic co-axial wire monopoles with a gain of around 2dBi

    Regards,
    David

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  9. #25
    Prolific Poster normnet's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    Quote Originally Posted by Les View Post
    Because the final sound is going to come from a PA, CD audio quality or stereo is not a real issue.

    Why not use a LoRA tranceiver and simply transmit 12-bit or 16-bit audio data to another LoRA and place it through a DAC. The LoRA tranceivers have a range of up to 10Km and should be sufficinet for a bit rate high enough for PA audio.
    Maximum Over-the-Air Data Rate 300 kbps with FSK modulation; 12500 bps with LoRa Technology modulation.
    Random selection of RN2903 LoRa:
    http://ww1.microchip.com/downloads/e...S50002390G.pdf

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  11. #26
    Prolific Poster shantanu@india's Avatar
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    Default Re: Streaming the same audio track in real time to two different locations

    Quote Originally Posted by Les View Post
    Because the final sound is going to come from a PA, CD audio quality or stereo is not a real issue.

    Why not use a LoRA tranceiver and simply transmit 12-bit or 16-bit audio data to another LoRA and place it through a DAC. The LoRA tranceivers have a range of up to 10Km and should be sufficinet for a bit rate high enough for PA audio.
    Thanks Les for the LoRA solution. I had no idea that such modules existed , that too marketed by microchip.
    Thanks Norm for the datasheet.
    After getting so much info about direct wireless solutions , I am pretty confidant now that if I have the right hardware streaming should not be a problem,
    Shantanu

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