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Reply With QuoteThe Ford Focus' actually have this feature. Really cool. Might try going to a junk yard and ripping it off one or ordering the part and modifying it. Worth a try!
--Ashlawn
I have a slight problem, at slow speeds my engine is nice and quite, no problem, I can happilly play my tunes at a sensible volume. However when I put my foot down, the noise level goes throught the roof, sure the stright through exaust & induction rar are nice, but it meens I have to crank my tunes up to hear them.
Not a problem, the sound system can produce more noise than my ears can take. But when I ease of the power the stereo is too much for my tender little ears.
Now as I'm very lazy, and adjusting the volume is too much like hard work. Does anyone know of a of a speed (well rev would be better) controlled volume control. Which will go between the head unit and amp(s)
I was toying over the idea of building one, based on a modified digital rev meter, a few opp amps and a bit of magic. Howevr if a ready made one exists then all the better.
And you say people actually pay money for M$ Windows?
www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)
The Ford Focus' actually have this feature. Really cool. Might try going to a junk yard and ripping it off one or ordering the part and modifying it. Worth a try!
--Ashlawn
well those cars that have it uses a mic to pick up noise level of the cabin. the more noise inside the cabin, the higher the stero volume. alot of new cars have it.
My Malibu has this feature too. It doesn't have the functionally anymore because it only works with the factory head unit. I almost immediately ripped out the factory head unit after I bought the car, so I never got much of a chance to see how well it worked.
The factory head unit has a VSS (vehicle speed senor) input and automatically turns up the volume as your speed increases.
Few years back I had a JVC chameleon (the first model that came out) and it had that exact function. When your RPMs go up so does the amount of juice your alternator puts out and it would sense that and adjust the volume accordingly.
that seems like the best method.... I know a mate was successfully turning an old PC into a rev gauge a few years back, basically hooking up from the ignition system to a pin on the printer port (with some middle hardware too - remember printer ports are only 5V!) and then monitor the number of clicks on the printer port...... something like that sounds very doable...Originally posted by digitalww
Few years back I had a JVC chameleon (the first model that came out) and it had that exact function. When your RPMs go up so does the amount of juice your alternator puts out and it would sense that and adjust the volume accordingly.
Project - GAME OVER :(
that is completely untrue...Originally posted by Alphared
well those cars that have it uses a mic to pick up noise level of the cabin. the more noise inside the cabin, the higher the stero volume. alot of new cars have it.
if you have a mic in the cabin... then it would pick up the radio noise, and increase the radio output to drown out the "noise" it picked up. that would mean that it would keep getting louder until the volume is maxed out, the speakers blow, the car is turned off... etc.
the real way that speed controlled volume works, is that the vehicle computer is linked to the radio. in late model GM vehicles, this is known as class 2 data wiring. basically, the computer relays a electrical signal to the radio, which it decodes and from that signal, it knows the speed of the vehicle. from this information, the radio increases the volume to cover the road/engine/wind noises. typically, there is a setting that can be toggled between off/low/med/high so that the driver has final say in whether or not the SCV is on, and at what rate the volume increases.
that same class 2 data wire is why late model cars can have radios that remain on when the car is turned off and the key removed. the computer is essentially flipping a relay to turn on and off the power to the deck....
this is also the reason that 99% of the radio installation shops throughout the US will NOT install radios in many late model GM cars. not because it is impossible.. far from it. but is it just that they do not understand the electronics involved.
~mike
Single Member of the "1000 Post and No MP3 Car" Club
PROJECT ON INDEFINATE HOLD... BOUGHT A HOUSE
2000 Cavalier Z24 [###-------] Only 30% Done ... Still
Oh really, someone should tell nissan & Bose then, cause in the 350z, bose system uses AudioPilot Noise Compensation Technology, which have a mic under the steering wheel to pick up cabin noise and increase/decrease volume.that is completely untrue...
if you have a mic in the cabin... then it would pick up the radio noise, and increase the radio output to drown out the "noise" it picked up. that would mean that it would keep getting louder until the volume is maxed out, the speakers blow, the car is turned off... etc.
also, in the prelude, they have mic to do the same.
Don't believe me, check it out for yourself:
http://www.bose.co.uk/product/auto/a...lot_tech.shtml
Don't rule out technology just cause you never heard of it!
he does have a valid point though, I'd be interested to know how it distinguishes between engine noise and actual music or speech inside the car.Originally posted by Alphared
Oh really, someone should tell nissan & Bose then, cause in the 350z, bose system uses AudioPilot Noise Compensation Technology, which have a mic under the steering wheel to pick up cabin noise and increase/decrease volume.
also, in the prelude, they have mic to do the same.
Don't believe me, check it out for yourself:
http://www.bose.co.uk/product/auto/a...lot_tech.shtml
Don't rule out technology just cause you never heard of it!
Wouldn't it be easy enough to setup a noise cancellation system that would sample engine noise and play the reverse in the cabin so the noise cancels out?
birrman54
It acts like a noise canceling headset. It takes all the noise from the cabin (ambient and stereo) and filters it then goes into a compensation filter which up the volume if ambient is higher than stereo. Since its part of the system, It can tell whats noise and whats coming from your stereo (like the headset). check the bottom of that link, i'll tell you how they do it.
This is more effective than speed volume change cause what happens if you have the window down or up, how can it tell how much noise is in the cabin?
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