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Thread: Constant volume software?

  1. #1
    Newbie Donny Bahama's Avatar
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    Question Constant volume software?

    Sorry if this has been asked already - I searched long & hard but didn't find it...

    Is there any software that uses a microphone to sense ambient noise level, then keep the music volume XdB above that? This is a major feature for those of us into top-down motoring. It's becoming more common on stock stereos in high-tech luxury convertibles, and I think some of the higher end head units are starting to offer it as well. This one feature would probably put me over the top and steer me toward a car pc.

    Thanks in advance for the help!

  2. #2
    Raw Wave Confused's Avatar
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    I believe most of these higher end units will be doing this based on speed rather than noise. If you measure noise, it will increase volume to compensate, which will increase the volume to compensate for the extra noise and within a few seconds your carpc will be playing music at full volume without being able to turn it down!

    The best way would be to compensate the volume based on speed, either gathered from ODBII or GPS.

    The only problems I can see with doing this is you'll have to have some kind of algorithm to decide how much to increase the volume by, and if you're doing it by GPS, what happens if you lose a lock and the "speed" it thinks you're going drops to 0?

    I'm thinking about implementing something like this in AIMEE, reading the speed via GPS, just need to decide how much to adjust the volume by for different speeds



    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  3. #3
    Newbie Donny Bahama's Avatar
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    Quote Originally Posted by Confused
    I believe most of these higher end units will be doing this based on speed rather than noise.
    OK, I could see that. Should work most of the time, too, but then there's those situations where a couple of Harleys with straightpipes pull up next to you...
    If you measure noise, it will increase volume to compensate, which will increase the volume to compensate for the extra noise and within a few seconds your carpc will be playing music at full volume without being able to turn it down!
    Unless, of course, the microphne lives right behind a fine metal screen behind the front grille... Then you mostly measure the white noise of the wind hitting it which would, in most cases (I think) be louder than the measured SPL of music from the car's interior. (?) Or maybe I'm way off base!
    I'm thinking about implementing something like this in AIMEE, reading the speed via GPS, just need to decide how much to adjust the volume by for different speeds
    Nice to know someone is thinking of doing *something*. I would suggest that the "how much to adjust the volume by for different speeds" would be a user setting, and it should be transparent to the user - no different than the "regular" volume control I'm accustomed to using. Also, if it's speed based, there needs to be a lower threshold below which (speed) it doesn't kick in and adjust the volume. Most convertibles are as quiet at 25MPH as they are at a standstill.

    BTW- Your avatar is a hoot!

  4. #4
    Newbie Micco's Avatar
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    Of course, if you are really ambitious you could use a dsp to subtract (cancel) the signal 'out' of the soundcard from the signal the mic is picking up (with appropriate delay), doing an exponentially weighted moving average of the resulting net sound pressure and adjust the volume based on that...
    Micco
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  5. #5
    Newbie Donny Bahama's Avatar
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    Has this been done yet?

    It's been a couple of years since I first asked this (time flies!) and I still haven't built a car pc (but I'm about to start!) I was just wondering if there were any updates on this?

  6. #6
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    You know, since RR has speed based on GPS, I would think having some way to take that data and adjust volume should be fairly simple. You would need to have range adjustments so you could configure the max and min so you can get a proper sweep, but it seems possible.

    All that said, what the heck do I know, I am not a developer, just a guy with an overactive imagination.

    Chris

  7. #7
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    Quote Originally Posted by HyperSprite View Post
    You know, since RR has speed based on GPS, I would think having some way to take that data and adjust volume should be fairly simple. You would need to have range adjustments so you could configure the max and min so you can get a proper sweep, but it seems possible.

    All that said, what the heck do I know, I am not a developer, just a guy with an overactive imagination.

    Chris
    RR has this feature already, if I remember correctly its not in the standard RRConfig but was in another. You can just edit rr.ini manually and set it up that way. It works great.

  8. #8
    Newbie Donny Bahama's Avatar
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    Sorry, but I'm a newbie, here... what is "RR"?

  9. #9
    FLAC alti's Avatar
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    rr= roadrunner (frontend)
    My Install

    Software:
    CFiG v1
    iGuidance Plugin for CF

    CarShell
    Working shell for a CarPC

    StopWatch
    StopWatch plugin remade for centrafuse RC1

  10. #10
    Newbie Donny Bahama's Avatar
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    Can someone point me to a definitive thread where the latest release of RR is discussed. (Is there an "official" thread for this?)

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