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  1. #1
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    Using a convolver in conjunction with LMS / PCP

    I知 attracted to the idea of setting up a streaming system based on SoundCheck痴 LMS/PCP guidelines and having a separate LMS server and PCP client. However I also want to apply DSP filters derived from AudioLens. My IT knowledge is limited, so I知 seeking advice as to what would be the best / most straightforward way of combining convolution with the LMS / PCP set up. (I知 assuming the convolution would be applied in the LMS server rather than the PCP client, but you may tell me otherwise . . . ). All advice will be gratefully received.

  2. #2
    Senior Member Apesbrain's Avatar
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    One option is Inguz EQ (search here). I don't know if it runs on piCorePlayer/LMS; I run it on Windows/LMS. Yes, convolution runs on the server.

  3. #3
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    Quote Originally Posted by Apesbrain View Post
    One option is Inguz EQ (search here). I don't know if it runs on piCorePlayer/LMS; I run it on Windows/LMS. Yes, convolution runs on the server.
    Based on a quick bit of research it looks like Inguz only works on 2 channels. I need to apply filters for at least 6 channels, possibly 8.

  4. #4
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    @iansr

    It might be worth a read of this

    https://www.aysabtu.dk/blog/raspberrypi-convofs/

    The dev is familiar with LMS so may be able to advise accordingly

    ronnie

  5. #5
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    Thanks Ronnie, I just had a quick read. Looks like it would not work on a streaming service like Qobuz or internet radio, so not suitable for my needs. However I think CamillaDSP will work if I can figure out how to do it. There’s lots of assumed knowledge in the available guidance. Always the same with computer related stuff
    Last edited by iansr; 2021-12-26 at 02:42.

  6. #6
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    Quote Originally Posted by iansr View Post
    Based on a quick bit of research it looks like Inguz only works on 2 channels. I need to apply filters for at least 6 channels, possibly 8.
    LMS internally only deal with 2 channels.
    For any special audioprocessing - usually it is done by transcoding with Flac in and Flac out as that is the only way for it to happens within LMS.

    However, within an LMS setup, it is the player which decode the audio stream data into playable audio samples, and now that players such a PI have reasonable processing power - it makes more sense to do any audio processing on the player.

    The simplest approach is likely to be some sort of ALSA based module as there are already generic (i.e. non LMS) examples of audio processing and equalising. ALSA can also deal with multi channel.

    A similar question was before about CamillaDSP https://forums.slimdevices.com/showt...712-CamillaDSP and there is a post about how to route ALSA audio through CamilaDSP https://henquist.github.io/0.6.2/backend_alsa.html
    Last edited by bpa; 2021-12-26 at 02:38.

  7. #7
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    @bpa. Our posts crossed. Thanks though.

  8. #8
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    I don;t know anything about Audiolens - I can only find references to AudioLense

    If AudioLense is the system then it looks like a user has been trying to use Audiolense filters in CamillaDSP see https://moodeaudio.org/forum/showthread.php?tid=4103

    Having DSP within the ALSA environment would enable squeezlite based player to leverage any non LMS developments (i.e. no LMS specific development needed).

  9. #9
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    Quote Originally Posted by bpa View Post
    I don;t know anything about Audiolens - I can only find references to AudioLense

    If AudioLense is the system then it looks like a user has been trying to use Audiolense filters in CamillaDSP see https://moodeaudio.org/forum/showthread.php?tid=4103

    Having DSP within the ALSA environment would enable squeezlite based player to leverage any non LMS developments (i.e. no LMS specific development needed).
    Yes I missed the e off ! Thanks I will look at that.

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