28 May
2015
28 May
'15
10:35 a.m.
Problem solved.
The crosstalk occured in wires connecting the motherboard and the front
panel mic and headphones jacks. I disconnected this cable and the echo
disappeared.
Thanks for your advices!
On 05/27/2015 11:04 AM, Adrian Knoth wrote:
On 05/27/15 10:35, Gordonjcp wrote:
What Gordon said. There is absolutely zero crosstalk in digital
systems,
it's a concept from analogue.
In a digital system, each port/channel is a memory buffer. Nothing
accidentally touches this buffer, and if so, the signal would be totally
ruined (think of random bit flips in digital samples).
For an attenuated and delayed signal, you'd need to multiply and add the
initial signal, e.g., out=0.4*remote[-X]+local. This doesn't happen by
accident, something is actively feeding the output back into the stream.
I agree with Gordon's assessment that PC2 is most likely recording from
Mix ("record everything that goes to the hardware outs"), thus creating
a delayed loop.
The fix is to open alsamixer -c X and choose "Mic in" in the records tab
instead of "Mix".
HTH
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I want to
avoid the echo and I have two ideas where the problem can be:
1) there is a crosstalk between jack ports/clients
2) there is a crosstalk in my HW (mainboard sound device with
intel_hda driver)
Most likely the latter. Check you haven't got the mix
parameter
turned up.