Re: Record output and input channel to one stereo wav file

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Hi Per

This would be a option, but than I lose a input channel for this. Is there no way to do that with alsa?

Regards

Peter

 

From: Per Andersson [mailto:artifex@xxxxxxxxxx]
Sent: Dienstag, 07. Oktober 2008 00:37
To: BILLEK Peter
Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: Record output and input channel to one stereo wav file

 

Hi Peter

Looping back the output signal to an unused input channel
will give you perfect sync.

Regards

Per Andersson
Artifex software
Sweden

----- Original Message -----
From: "BILLEK Peter"
To: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Record output and input channel to one stereo wav file
Date: Mon, 6 Oct 2008 16:20:17 +0200

Hi.

I am using a M-Aduio Delta 1010, with a setup that I have 8 single input/output channels. That works great with ALSA, and I can record and playback simultaneous on all channels.

What I want to do, and up till now not found a solution for,  is to record one output channel and one input channel simultaneous to a stereo file.

The use case for this is, that I want to measure the delay of a external communication system in an automatic way. So I playback (aplay) a wav sample out off channel 1, send it via my external communication system and record it back via channel 2 (arecord).

This will end up in 2 none correlated files. Want I want to have is a device where I can record a stereo file (arecord –D out_in_mix …) that will have channel 1 output (left) and channel 2 input (right) of my Delta 1010 in it

OUT1  ---->---------

        |          |

        |          V

REC   -<-      ----------

Stereo-<-      |Com Ext.|

        |      ----------

        |          |

        |          |

IN2 ------<---------

I tried with the dmix and copy plugin, but so far no luck.

Any suggestions are welcome.

Regards

Peter

____________________________________________________
(Ing.) Peter Billek
SYSE / System Engineer
FREQUENTIS AG

Innovationsstraße 1  1100 Vienna, Austria
Phone   +43-1-811 50 - 3704
(Mobile  +43-664-60 850 - 3704)
Fax       +43-1-811 50 - 77 3704

Web      www.frequentis.com
E-Mail    peter.billek@xxxxxxxxxxxxxx

Handelsgericht Wien (Vienna Commercial Court): FN 72115 b
DVR 0364797, ATU 14715600
____________________________________________________


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