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6376
June 21st, 2003 13:00
C840 Microphone Recording Level problems
Hi Guys,
If I plug an external Microphone into my laptop, unless you practically shout into it, your voice isn't recognised. I have tried 3 different mics, I have set the recording volume to max in the volume control options etc... and I have installed the latest drivers off the dell web site.
Has anyone else come across this problem before and if so do they know of a fix?
I am runnung Win2k if this makes a difference.
Thanks
Simon.
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sommerman
2 Posts
0
June 24th, 2003 09:00
Hello,
I have the same problem. When I'm talking in the microphone the voice isn't recognized.
I have a web camera with the microphone suspended. Windows 2000 on DELL C840. Tryed different microphones. Installed new drivers. Checked all settings. And still there is no sound from the microphone.
Anyone know have to fix this?
JersWork
770 Posts
0
June 24th, 2003 12:00
I was having a similar problem a while back and here is what I have found...
My Labtec headset with stereo microphone was giving me a very weak signal if I tried to talk quietly. After turning the mirophone gain all of the way up, and enabling the 10db signal boost, it helped, but the signal was still much weaker than what I had hoped for. Next, I started looking around in the local electronics stores for a little device which existed about 7 years ago when OS/2 Warp v4 was first released. It was a little in-line power booster that pluged into the mirophone port and then the mic plugged into it. A number of sound cards had this problem when OS/2 first released its voice comand capability, and this piece of hardware was a solution to that problem.
Since I wasn't able to locate that little signal booster, I went the next logical step. While this solution was better than what I had, it was still below what I felt I should be getting. This solution was to buy a USB microphone which powered its ampliphier from teh USB port. This gave me a much stronger signal, but the USB headset/microphone is not fully hot-pluggable...
MikeC1701
4 Posts
0
December 27th, 2003 17:00
Hi
Here is a possible fix - it works for me and the three C840's that I have. I think the .inf file in Version A09 has a typo. I did a lot of looking at the chipset (crystal 4205) and downloaded their description and I think that the inf does not allow sufficent "steps" in the register that controls the recording volume. Sorry for being wordy, but I was rather pleased with myself for fixing this and no one at Dell support ( ok, the india dell support) would even bother to reply.
Anyway - get the latest driver, run the executable but don't bother to update the driver. Go to the files it installed ( c:\dell\drivers\r48991). Look for cwawdm.inf and open it. Look for the following
;
; Volume controls attached to muxes all use a uniform volume setup.
;
HKR,Mixer,RecordMin,1,00,00,00,00
HKR,Mixer,RecordMax,1,00,80,16,00
HKR,Mixer,RecordStep,1,00,80,01,00
HKR,Mixer,MonoOutMin,1,00,80,d1,ff
HKR,Mixer,MonoOutMax,1,00,00,00,00
HKR,Mixer,MonoOutStep,1,00,80,01,00
HKR,Mixer,Record4205Min,1,00,00,01,00
HKR,Mixer,Record4205Max,1,00,00,06,00
HKR,Mixer,Record4205Step,1,00,00,01,00
In the line HKR, Mixer, Record4205Max,1,00,00,06,00
change the 06 to 16.
Now you get 16 steps of 2.5 db per step.
save this file and then install the driver.
Hope this helps.