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Thread: To those who have implemented tuning on the PC

  1. #11
    Car Audio Moderator durwood's Avatar
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    Hmmm, well as far as the idea of a separate tuning forum, that could lead to more sub-forums. How much would we divide it into subforums before it would start to look more and more like a regular car-audio forum?

    I have only seen a handful of people wanting more advanced tuning topics and I think there is a ton of great info already in the wiki. It could use some more additions, but I think most of the methods are in place ATM. I think the ASIO/VST method could be expanded on because there is more than one way to skin a cat and it is the most complex.

    Maybe I/we could go back in time a bit and dig up all the old treads pertaining to tuning and lump them into a new FAQ?

    What types of info does everyone want?

  2. #12
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    Initially, I made the suggestion because it seemed like there were a lot of threads going about it...in reality, there's maybe 1 or 2 threads about it total...not enough for a sub-forum.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  3. #13
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    hm, guess your right... how about a subforum for high end stuff, kinda like show off you project & then works in progress kinda setup? maybe still not enough for that to I guess...

  4. #14
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    then I'd see users getting confused about where to post their work logs...because let's face it...some users think their install is the hottest stuff since sliced bread...when some of us would look at it and wonder....
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  5. #15
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    no, I'm sorry, I just ment a forum within a forum, "like" the worklog section is set up...

  6. #16
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    The Linux side of it :)

    I've been looking at how this can be done under linux for the past few weeks. So far this is what i've come up with, along with some linux audio basics so non-linux people can follow.

    the linux equivalent to ASIO is called JACK, and requires that the rt (realtime) kernel patches are applied. With jack the output of one program can be internally "plugged" into the input of another, so i can run mplayer (a video player) with the jack audio driver, output it to preprocessing sw #1, send that to #2, then out to the speakers (technically processing differently for each speaker, at the cost of processing power).

    So far i've been looking at this as 3 main categories, with some overlap.

    1. Audio processing - eq, crossovers, delays.

    Realtime eq and crossovers can be set, along with a number of other setting with a program called jammin. I've been doing some tests over the last week, and it seems stable and mature.

    Delays would be set on a speaker individual basis, so they may need to be implemented a little differently.

    2. Upsampling - take everything to play and upsample it to 5.1/7.1, along with any other effects that want to be used to enhance the sound.

    This area i've found less information on, and am hoping this thread will be able to help get more information in this area out in the open. the closest program i've found that does "some" of this is ac3jack, but thats a batch program, not realtime, so it would need to be modified heavily.

    3. Physical connections - How to get the upsampled dts sound to the right speakers, without loss of quality.

    The threads on amps with s/pdif and optical inputs was a bit of a downer, as it sounds like most of these amps are hard to get working, or even ahold of. I'm planning on doing some tests when i have free time next year of output meathods. My experience with linux audio though has been mostly recording setups, so I know I'm a bit behind in the car audio world, i'll post test results if I come up with anything useful.

    IMPORTANT INFORMATION:
    if you are messing around with jack (the linux audio subsystem) for the first time, know it can be a little difficult to work all the bugs out of your kernel configuration to rt works with out xruns (dropping audio packets), so if you see xrun messages, know your audio won't work correctly untill they are taken care of (search google its your friend).

    if anyone else is looking into this i'd enjoy hearing from you, either on this thread or in a pm.

  7. #17
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    2. Upsampling - take everything to play and upsample it to 5.1/7.1, along with any other effects that want to be used to enhance the sound.
    Technically that's not upsampling. More likely to find answers if you look for surround sound effects processing.

    One of the main reasons why I'm implementing a CarPC is for the ability to run real time ambiphonics processing - note this utilises non standard speaker locations, and i've only found windows bassed "processors".

  8. #18
    Constant Bitrate Felix509's Avatar
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    2. Upsampling - take everything to play and upsample it to 5.1/7.1, along with any other effects that want to be used to enhance the sound.

    This area i've found less information on, and am hoping this thread will be able to help get more information in this area out in the open. the closest program i've found that does "some" of this is ac3jack, but thats a batch program, not realtime, so it would need to be modified heavily.

    3. Physical connections - How to get the upsampled dts sound to the right speakers, without loss of quality.



    We may need to move this to it's own thread...

    Changing audio from Stereo to 5,1 or 7.1 would be called encoding.

    There are a few sound cards out there that have real time encoding built in, called Dolby Live. They utilize the C-Media CMI8770 PCI chipset and it seems like quite a few other chipsets have the Dolby Live also.

    A soundcard that had that feature would give you your outputs realtime from a stereo source.
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  9. #19
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    more hardware questions

    thanks for the initial info, is that the same chipset redgt is using?

    So if i have a soundcard, or program running that re-encodes to 5.1 in realtime, i'm wondering if a Pioneer DEQ-P7000 would be a good solution between the computer and amps. then i can run an s/pdif signal to it from the computer, and output the channels correctly, and with little added noise (this is assuming i'm using software to reencode, and my soundcard doesn't have the high quality of redgt's setup), then use a 4 channel amp for the front speakers, and seperate amp for the sub off it.

    I was looking online and found some cards that support Dolby Digital Live (DDL), but had trouble finding if they have linux support for DDL =(.

    (seperate note)
    for anyone not familiar with it Audacity (windows or linux) had a frequency generator built into it that could be used for tuning purposes.

  10. #20
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    Curious why the Pioneer over the Alpine, wirelessdreamer?

    BTW - the chipset in the sound card I've modified (but have not put into the car...) is the C-Media CMI-8788.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

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