AC97 activation hotkey?

Frankino · Dec 13, 2005, 12:26 PM

hello, I use kx drivers in a carpc environment, if I keep AC97 source always unmuted I got background noise from the speakers, so I'm looking for a way to activate AC97 input only when needed, maybe using an hotkey or an external application which could access the mixer configuration and enable/disable AC97 without altering the volume settings.. I know I could use two different DSP settings and load one of them when needed but it's kinda problematic with the volume setting beeing saved in the DSP preset.. any idea? thank you

Maddogg6 · Dec 13, 2005, 06:07 PM

I 99% certain it IS possible - but Im also thinking the exact commant to use may depend on DSP config.

One way I KNOW is possible is a command that can CONNECT and DISCONNECT pins in the DSP - this prolly isnt most desired method - but I think can work.

OR *maybe* theres a simple register to set (Mute On/Off) - but I cant find info on this at the moment.

Look here as it pertains to you also..
http://www.hardwareheaven.com/general-discussion/76116-using-kxctrl-swap-front-rear-output.html

Lex Nahumury · Dec 13, 2005, 07:16 PM

A .bat file containing;
kxctrl -sac97 reg val
should work.

Review ac97.h and ac97 specs for what register/value.

HTH,

/LeMury

Frankino · Dec 13, 2005, 07:18 PM

well I saw that if you mute the linein in the windows mixer it works, and I know how to address that control with my frontend touchscreen application.. so I think I solved

by the way I don't know why I get so much noise from the line in..
even if I do not connect a jack to the SB linein I get noise..

EDIT: by the way, thanks for the replies

Maddogg6 · Dec 13, 2005, 09:07 PM

to reduce noise to minimum - inputs should be to ground - disconnecting *may* not do this - and the input pin can act like an antenna - especially in a car.

Power supply injected noise - car alternator power is VERY noisy - and true earh grounds are not likely. Make sure your mobile PC has clean power supplied to it.

If using an invertor - try another brand or increase the inverter capacity
So If Im using a 250W PS on my mobile PC - Id prolly look for a 400 or 500 W inverter.
As inverters near capacity - any number of things can happen -
1) Intermitant PC shutdown - from invertor turning off
2) Clipped or distorted power input - causing harmonics to be triggered and NOT necessarily filtered out.

Frankino · Dec 14, 2005, 12:49 PM

humm, will try to ground them properly, thanks
the alternator is not an issue, I use a DCDC psu so it's all filtered and stabilized

Dec 13, 2005, 12:26 PM	#1
Frankino DriverHeaven Newbie Join Date: Mar 2005 Posts: 11 Rep Power: 0	AC97 activation hotkey? hello, I use kx drivers in a carpc environment, if I keep AC97 source always unmuted I got background noise from the speakers, so I'm looking for a way to activate AC97 input only when needed, maybe using an hotkey or an external application which could access the mixer configuration and enable/disable AC97 without altering the volume settings.. I know I could use two different DSP settings and load one of them when needed but it's kinda problematic with the volume setting beeing saved in the DSP preset.. any idea? thank you

Dec 13, 2005, 07:18 PM	Thread Starter #4
Frankino DriverHeaven Newbie Join Date: Mar 2005 Posts: 11 Rep Power: 0	well I saw that if you mute the linein in the windows mixer it works, and I know how to address that control with my frontend touchscreen application.. so I think I solved by the way I don't know why I get so much noise from the line in.. even if I do not connect a jack to the SB linein I get noise.. EDIT: by the way, thanks for the replies Last edited by Frankino; Dec 13, 2005 at 07:27 PM.

Dec 13, 2005, 06:07 PM	#2
Maddogg6 Tail Razer Join Date: Jun 2005 Location: Bernyurass, AZ - USA Posts: 4,027 Rep Power: 0	I 99% certain it IS possible - but Im also thinking the exact commant to use may depend on DSP config. One way I KNOW is possible is a command that can CONNECT and DISCONNECT pins in the DSP - this prolly isnt most desired method - but I think can work. OR maybe theres a simple register to set (Mute On/Off) - but I cant find info on this at the moment. Look here as it pertains to you also.. http://www.hardwareheaven.com/general-discussion/76116-using-kxctrl-swap-front-rear-output.html

Dec 13, 2005, 07:16 PM	#3
Lex Nahumury DH Senior Member Join Date: Jan 2003 Location: The Netherlands Posts: 1,932 Rep Power: 64	A .bat file containing; kxctrl -sac97 reg val should work. Review ac97.h and ac97 specs for what register/value. HTH, /LeMury

Dec 13, 2005, 09:07 PM	#5
Maddogg6 Tail Razer Join Date: Jun 2005 Location: Bernyurass, AZ - USA Posts: 4,027 Rep Power: 0	to reduce noise to minimum - inputs should be to ground - disconnecting may not do this - and the input pin can act like an antenna - especially in a car. Power supply injected noise - car alternator power is VERY noisy - and true earh grounds are not likely. Make sure your mobile PC has clean power supplied to it. If using an invertor - try another brand or increase the inverter capacity So If Im using a 250W PS on my mobile PC - Id prolly look for a 400 or 500 W inverter. As inverters near capacity - any number of things can happen - 1) Intermitant PC shutdown - from invertor turning off 2) Clipped or distorted power input - causing harmonics to be triggered and NOT necessarily filtered out.

Dec 14, 2005, 12:49 PM	Thread Starter #6
Frankino DriverHeaven Newbie Join Date: Mar 2005 Posts: 11 Rep Power: 0	humm, will try to ground them properly, thanks the alternator is not an issue, I use a DCDC psu so it's all filtered and stabilized