Hi all,
I have a setup where I take a stereo audio track created in Matlab (L track contains signal, R track contains noise) and present it out through the audio jack on my computer using a 1->2 RCA cable. This RCA cable should split the digital stereo track into 2 separate analog mono tracks for further processing. When I silence one of the analog cables (by unplugging either the L or R) in an attempt to either completely remove the signal or the noise, what I find is I'm left with a track that contains both signal and noise. If I unplug the L track, the remaining track tends to have louder noise than signal, whereas if I unplug the R track, the remaining track has a louder signal than noise. This suggests to me that the signal is somehow being premixed before splitting the stereo track into 2 analog mono tracks. I'm fairly certain the problem isn't the 1->2 RCA cable because I've tried using a simple 3.5mm headphone splitter instead and it does the same thing. I am working on Windows 7 with a Creative SB X-Fi sound card with the following details:
Driver Provider: Creative
Driver Date: 7/7/2010
Driver Version: 6.0.1.1348
Driver Signer: Microsoft Windows Hardware Compatibility Publisher
I would really appreciate any ideas for why the signal is behaving this way.
Cheers,
Jeff
I have a setup where I take a stereo audio track created in Matlab (L track contains signal, R track contains noise) and present it out through the audio jack on my computer using a 1->2 RCA cable. This RCA cable should split the digital stereo track into 2 separate analog mono tracks for further processing. When I silence one of the analog cables (by unplugging either the L or R) in an attempt to either completely remove the signal or the noise, what I find is I'm left with a track that contains both signal and noise. If I unplug the L track, the remaining track tends to have louder noise than signal, whereas if I unplug the R track, the remaining track has a louder signal than noise. This suggests to me that the signal is somehow being premixed before splitting the stereo track into 2 analog mono tracks. I'm fairly certain the problem isn't the 1->2 RCA cable because I've tried using a simple 3.5mm headphone splitter instead and it does the same thing. I am working on Windows 7 with a Creative SB X-Fi sound card with the following details:
Driver Provider: Creative
Driver Date: 7/7/2010
Driver Version: 6.0.1.1348
Driver Signer: Microsoft Windows Hardware Compatibility Publisher
I would really appreciate any ideas for why the signal is behaving this way.
Cheers,
Jeff
Hi,
Why are you sending two tracks, one noise only to a mono output ?
I don't understand you post. seems like you've got autogain
on your inputs which ups noise if the input is unplugged.
rgds, sreten.
Why are you sending two tracks, one noise only to a mono output ?
I don't understand you post. seems like you've got autogain
on your inputs which ups noise if the input is unplugged.
rgds, sreten.
I would expect a 1->2 RCA cable to behave pretty much as you describe.
A stereo male to 2x stereo female, or stereo male to L and R female?
If you're fairly certain the signal isn't being summed by the cables, that leaves the computer itself as culprit.
You should check the setup of your sound card.
Make sure that the output is set for stereo speakers.
Disable all effects.
Make sure that the output is set for stereo speakers.
Disable all effects.
And if your audio card has any mixer controls, make sure both L and R signals are panned all the way to the extreme L and R setting.
The relative levels are critical as regards deciding what is going on, but 3.5mm stereo jack sockets (and plugs I guess), have an intrinsically high level of crosstalk, IIRC. You can probably find the figures on nwavguy's blog.
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