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#58024 - 11/01/2002 20:47 auto compensating volume?
alfaguy
new poster

Registered: 30/11/2001
Posts: 17
Don't know if this has been discussed before, but since the Empeg has a microphone input would it be possible to use this to monitor the ambient sound level in the car and adjust the relative volume accordingly?

This would be especcialy useful to those of us with rather loud convertible sports cars.

Thanks,
Jeff

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#58025 - 12/01/2002 00:09 Re: auto compensating volume? [Re: alfaguy]
tfabris
carpal tunnel

Registered: 20/12/1999
Posts: 31602
Loc: Seattle, WA
One of Rjlov's original goals with the Voladj kernel was to do something like that. Hasn't been implemented yet.

In the meantime, give Mark Lord's "hijack" kernel a try, which includes the voladj code. Hmm, maybe Mark can be persuaded to do something with it?
_________________________
Tony Fabris

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#58026 - 20/01/2002 20:53 Re: auto compensating volume? [Re: alfaguy]
TheAmigo
enthusiast

Registered: 14/09/2000
Posts: 363
What do you do about the obvious problem?

10 Someone opens a window.
20 Wind makes the noise level in the car go up.
30 The empeg turns the volume up.
40 Louder music makes the noise level in the car go up.
50 GOTO 30

Not to mention what happens when a song ends: as it fades out, the ambient noise level goes down so the volume goes down... all songs start out quiet.

I like the speed-sensitive idea of linking into OBD II.
_________________________
--The Amigo

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#58027 - 20/01/2002 23:29 Re: auto compensating volume? [Re: alfaguy]
hybrid8
carpal tunnel

Registered: 12/11/2001
Posts: 7738
Loc: Toronto, CANADA
You have an arm with which to reach over and spin the dial on the empeg or other head unit though, right? Just checking.

Bruno
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Bruno
Twisted Melon : Fine Mac OS Software

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#58028 - 20/01/2002 23:33 Re: auto compensating volume? [Re: TheAmigo]
hybrid8
carpal tunnel

Registered: 12/11/2001
Posts: 7738
Loc: Toronto, CANADA
Put the microphone OUTSIDE the cabin. Then when someone else comes along blasting their own music, your system will automatically get louder.

Obviously anything to monitor "noise" is going to have to compare the ambient sample to the data being played and cancel that portion out.

Bruno
_________________________
Bruno
Twisted Melon : Fine Mac OS Software

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#58029 - 21/01/2002 11:50 Re: auto compensating volume? [Re: hybrid8]
TheAmigo
enthusiast

Registered: 14/09/2000
Posts: 363
In reply to:

Obviously anything to monitor "noise" is going to have to compare the ambient sample to the data being played and cancel that portion out.




I thought of that later, but wouldn't that require a lot of CPU power?
_________________________
--The Amigo

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#58030 - 21/01/2002 11:58 Re: auto compensating volume? [Re: TheAmigo]
eternalsun
Pooh-Bah

Registered: 09/09/1999
Posts: 1721
Loc: San Jose, CA
Clearly if the empeg itself knows how loud it is playing the music, then it can cancel that part of the "volume detection" from the mike. Kind of like standing in a quiet room and screaming. You know that it is *still* a quiet room because your brain can ignore your vocal cords. If you are screaming in a loud room, then your brain knows it is a loud room as well.

Calvin

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#58031 - 21/01/2002 16:12 Re: auto compensating volume? [Re: eternalsun]
papinist
member

Registered: 30/12/2001
Posts: 119
Loc: Italy
Some head unit, like Pioneer or JVC ones, has the 'Cruise' function that makes the volume go higher when the ambient noise go higher (someone opens a window, engine roaring, you screaming... ) and lower it when e.g. you stop at a traffic light.

So it's a feasible thing...
_________________________
Stefano

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#58032 - 21/01/2002 16:31 Re: auto compensating volume? [Re: papinist]
Chao
member

Registered: 01/01/2002
Posts: 144
The 98 Camaro Convert I had featured a "SCV" function. I *think* it was Speed-Controlled-Volume, I never had the manual

It was great, the faster I went, the louder the stereo got to compensate for the windnoise.

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#58033 - 12/02/2002 23:26 Re: auto compensating volume? [Re: Chao]
CrashLander
stranger

Registered: 12/02/2002
Posts: 26
Or is that, "The louder the music played, the faster I drove." (i noticed that one time - I would turn up the volume, and the driver would speed up, and vice versa - consistantly)

Could we hook it up to the windshield wipers also - so there is more delay at stoplights and less at 55mph?

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