defiance
09-07-2003, 12:42 PM
Just curious as to whether or not this has been done. I'm trying to think of "new" things to add in to my system, and was considering an amibience compensation thingy. I don't know what they're called, but it's basically a device that increases volume when the ambient noise of the vehicle increases. Thus, the percieved volume remains constant. Anyone ever made anything like that?
Anyway, I'm pretty good with embedded systems, though I've never worked with digital signal processing... so, what I was considering was mounting a microphone just below the front center of the floorpan (just behind the engine compartment) to measure the level of noise outside the car. While it won't be exact, since that location will read a pretty good mix of wind, engine, and road noise, it should be very close to proportional to the volume inside the car. Anyway, I would then simply monitor the volume level on that mic, and I would have a variable resistance on the RCA lines; this resistance would be reduced as volume increases. Since it's mounted outside the car, I wouldn't need to do any DSP functions to filter out the stereo portion of the noise.
Anyway, anyone else ever done something like this? Either way, does it sound like a good idea? I'm really brainstorming for something to set my system apart, you know :)
Anyway, I'm pretty good with embedded systems, though I've never worked with digital signal processing... so, what I was considering was mounting a microphone just below the front center of the floorpan (just behind the engine compartment) to measure the level of noise outside the car. While it won't be exact, since that location will read a pretty good mix of wind, engine, and road noise, it should be very close to proportional to the volume inside the car. Anyway, I would then simply monitor the volume level on that mic, and I would have a variable resistance on the RCA lines; this resistance would be reduced as volume increases. Since it's mounted outside the car, I wouldn't need to do any DSP functions to filter out the stereo portion of the noise.
Anyway, anyone else ever done something like this? Either way, does it sound like a good idea? I'm really brainstorming for something to set my system apart, you know :)