Automatic volume level question

Libdawg · Jul 10, 2006, 01:03 AM

Ok all, got an interesting question for everyone. If it has been asked before point me in the right direction. I am looking for a way to control the output or the master volume automatically with input from a microphone that is plugged into the system. I am using a Creative Labs Sound Blaster Live with EMU10K1 chipset. I want to be able to keep all the output of the computer to stay at the same level no mater what else is going on in the surroundings. I want it to automatically change levels as the room gets noisier. It would be perfect for parties. I am using KX Version: 5.10.00.3537.

Thanks for the help,
Liberty

Maddogg6 · Jul 10, 2006, 01:24 AM

hmmm - interesting - sort of like 'speed compensation' in many car stereos now-a-days.

But i wonder if the 10KX DSP would have enough resources to hold 'smart' enough algo to be effective. ??

I mean - the music getting louder will add to the 'noise' picked up - and the only way to do this would be through some 'intelligent' filtering. - lets see what the real experts say on this subject.

**dj_stick** · Jul 10, 2006, 01:30 AM

might be possible sidechaining a dynamics processor to the mic input… but that usually does the opposite of what you ask

EDIT: didn't see maddog's response

it doesn't really need to be "intelligent"

if you sidechain a compressor to an input, that input triggers the compressor, reducing the level of the signal the compressor is applied to, relative to the input (used alot in dance tracks with the kick as the trigger

if there was a plugin that could do the opposite… and i don't think the expander is the right tool to use either

Libdawg · Jul 10, 2006, 02:02 AM

The 'speed compensation' sort of thing was exactly that I was thinking about. I am very new to all of this but this program seems like it has alot of flexability.

Liberty

Maddogg6 · Jul 10, 2006, 03:46 AM

A simple 'input level' to an inverse output could be inserted between the mic and side chain input.

Like: output = 1 - input

is that what your speaking of DJ??

edit: I have doubts a system like this would be as effective... but without trying - we'll never know for sure I suppose.

I was thinking an FFT filter to seperate the music from the crowd noise would be need for effectiveness.

xzero1 · Jul 23, 2006, 09:07 PM

The average value of the music before any mixing compensated at the played volume can be compared to the average value of the music played with the room noise (sampled by the mic) and used to control the music volume. Better yet, control the volume as above using a function of the [pure] volume level instead of the level itself. This will allow tweaking as desired.

jiiteepee · Jul 23, 2006, 09:55 PM

http://www.research-lab.com/volumecontrolread.htm

jiitee

Jul 10, 2006, 01:03 AM	#1
Libdawg DriverHeaven Newbie Join Date: Jul 2006 Posts: 2 Rep Power: 0	Automatic volume level question Ok all, got an interesting question for everyone. If it has been asked before point me in the right direction. I am looking for a way to control the output or the master volume automatically with input from a microphone that is plugged into the system. I am using a Creative Labs Sound Blaster Live with EMU10K1 chipset. I want to be able to keep all the output of the computer to stay at the same level no mater what else is going on in the surroundings. I want it to automatically change levels as the room gets noisier. It would be perfect for parties. I am using KX Version: 5.10.00.3537. Thanks for the help, Liberty

Jul 23, 2006, 09:07 PM	#6
xzero1 DriverHeaven Newbie Join Date: Jun 2005 Posts: 18 Rep Power: 0	The average value of the music before any mixing compensated at the played volume can be compared to the average value of the music played with the room noise (sampled by the mic) and used to control the music volume. Better yet, control the volume as above using a function of the [pure] volume level instead of the level itself. This will allow tweaking as desired. Last edited by xzero1; Jul 23, 2006 at 09:27 PM.

Jul 10, 2006, 01:24 AM	#2
Maddogg6 Tail Razer Join Date: Jun 2005 Location: Bernyurass, AZ - USA Posts: 4,027 Rep Power: 0	hmmm - interesting - sort of like 'speed compensation' in many car stereos now-a-days. But i wonder if the 10KX DSP would have enough resources to hold 'smart' enough algo to be effective. ?? I mean - the music getting louder will add to the 'noise' picked up - and the only way to do this would be through some 'intelligent' filtering. - lets see what the real experts say on this subject.

Jul 10, 2006, 02:02 AM	Thread Starter #4
Libdawg DriverHeaven Newbie Join Date: Jul 2006 Posts: 2 Rep Power: 0	The 'speed compensation' sort of thing was exactly that I was thinking about. I am very new to all of this but this program seems like it has alot of flexability. Liberty

Jul 10, 2006, 03:46 AM	#5
Maddogg6 Tail Razer Join Date: Jun 2005 Location: Bernyurass, AZ - USA Posts: 4,027 Rep Power: 0	A simple 'input level' to an inverse output could be inserted between the mic and side chain input. Like: output = 1 - input is that what your speaking of DJ?? edit: I have doubts a system like this would be as effective... but without trying - we'll never know for sure I suppose. I was thinking an FFT filter to seperate the music from the crowd noise would be need for effectiveness.

Jul 23, 2006, 09:55 PM	#7
jiiteepee HardwareHeaven Senior Member Join Date: Apr 2005 Location: FI Posts: 400 Rep Power: 0	http://www.research-lab.com/volumecontrolread.htm jiitee