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Thread: audio over USB v. optical

  1. #321
    Car Audio Moderator durwood's Avatar
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    Found something about Volume control with Winamp.

    A note: Winamp is relying solely on the soundcard API (waveOut, DirectSound, ASIO, KS, etc. depending on what plugin you are using) for volume control. It does not do any digital volume adjustment (except for replaygain and the preamp on the EQ)
    That came straight from a Winamp Developer in this thread post 8

    Post 12 is a good tidbit too.

  2. #322
    Newbie HIPPOhifi's Avatar
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    Quote Originally Posted by JasonWW View Post
    Just an interesting fact, but on XP and W2K even if the audio is not resampled from 44.1K to 48K it is STILL resampled from 44.1K to 44.1K through the Kmixer. This is yet another reason the SQ drops.

    You know, I forgot all about the special. I was thinking they where the regular price. Sorry about that.
    Just to clarify, the special is valid until the end of March.

  3. #323
    Variable Bitrate
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    After reading through the last 10 or so pages of this thread, I am very interested in this project! Not only for it's intended use, but for a new product as well. See the other thread about the Production Double-Din VGA Monitor for more info about the monitor.

    I am looking to add USB based audio circuitry to the new desgin. However, I want to do 3-5 stereo line INPUTS, not outputs. The device will have several AV inputs on the rear, and instead of having some sort of hardware audio mixer/switcher, it would be nicer if each set of stereo inputs showed up in the Windows mixer panel. Then the frontend software can fade and mix accordingly...

    The reason I am posting this here is because I think we're heading in the same direction as far as USB -> I2S. I'll use ADC's, and this project will need DAC's. Maybe we can somehow incorporate similar designs?

    I was looking into the TUSB3200 streaming controller, but it seems limited with it's USB 1.1.

    What do you think?

    - Brett

  4. #324
    Newbie HIPPOhifi's Avatar
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    Quote Originally Posted by Mrbmw99 View Post
    However, I want to do 3-5 stereo line INPUTS, not outputs.
    Just curious as to why so many inputs for a carpc?

    cheers,
    Brent

  5. #325
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    many modules require you to run them as an input...so into the computer then back out of the computer to the audio system.

    Doesn't XM work this way?
    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!

  6. #326
    Newbie HIPPOhifi's Avatar
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    Quote Originally Posted by RedGTiVR6 View Post
    Doesn't XM work this way?
    XM??

  7. #327
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    Some modules require you to go from the audio out port on the unit to the audio in on the computer, then have the audio in re-routed through the computer to the audio out on the computer.

    IIRC, XM for the CarPCs worked this way for a while...not XM for your normal car audio install.
    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!

  8. #328
    Car Audio Moderator durwood's Avatar
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    Quote Originally Posted by HIPPOhifi View Post
    Just curious as to why so many inputs for a carpc?

    cheers,
    Brent
    I think since they are designing a double din carpc, they want it to have audio switching capabilites as would a multimedia headunit would. I don't know what other audio devices would require line-in besides an FM tuner, or maybe some of the XM/Sirius Satelite radio pieces. If it's for an mp3player hookup??? we have car pc's no need for that.

  9. #329
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    The line inputs will be used for a switching/mixing capability (like a normal HU). There are several different sources that need to be switched between, such as the internal AMFM radio tuner, the XM or Sirius tuner, the 2 AV input sets on the back of the unit, etc..

    I'm just looking for a good USB design to use for this. Most USB devices on the market now are only 1 line input, so those don't work.

    - Brett W

  10. #330
    Newbie HIPPOhifi's Avatar
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    This would be a significant redesign of The Bloat and unfortunately don't have the time at the moment. More than happy to review and provide feedback on another design if someone else if willing to run with it.

    cheers,
    Brent

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