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line-out to line-in * bad idea

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Name: Mechanix2Go
Date: May 18, 2005 at 00:32:31 Pacific
OS: w2k
CPU/Ram: PIII 933 / 256
Comment:

I have tried a few progs to record streaming audio. None are entiely satisfactory.

Is there any good reason not to jumper line-out to line-in?

The impedance is probably the same. [unlike mic]

TIA

M2


If at first you don't succeed, you're about average.



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Response Number 1
Name: Richard59
Date: May 18, 2005 at 01:16:08 Pacific
Reply:

I fail to see how attempting to record the output of your soundcard via the line-in of the same soundcard could possibly produce a better result than direct recording of the data stream, even if it is possible.(I'm not sure it would even work) I think you would run into a feedback problem of monumental proportions. EG I have had my stereo connected to line-in and at the same time was playing a CD in the PC. The line-out which I have going to speakers produced a mixed garble of both sources.

Give a man a fish and you feed him for a day.
Teach him to fish and his wife will never forgive you.


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Response Number 2
Name: Mechanix2Go
Date: May 18, 2005 at 01:41:51 Pacific
Reply:

Hi Richard,

I think you're right about getting lower quality than catcthing the bit stream. That's the same reaction I got from a friend here who's very knowledgable and hard-headed.

Not a big deal for webradio nesw etc.

Not sure about feedback.

My main concern is voltage levels.

On the face of it, the two grounds should be the same. And the L&R shoud be referenced to ground, normally limited to 1 volt peak to peak.

Guess I'll get out the trusty DVM and make some voltage and continuity checks.

Thanks for your thoughts.

M2


If at first you don't succeed, you're about average.


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Response Number 3
Name: wizard-fred
Date: May 18, 2005 at 01:55:36 Pacific
Reply:

M2
If the sound card is full duplex the input and the output channels are independent and can function simultaneously. In some early soundcards only one function at a time.


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Response Number 4
Name: Mechanix2Go
Date: May 18, 2005 at 02:00:44 Pacific
Reply:

Hi wizard-fred,

It's AC97 on mobo.

Further thiughts?

Thank you,

M2


If at first you don't succeed, you're about average.


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Response Number 5
Name: wizard-fred
Date: May 18, 2005 at 02:53:55 Pacific
Reply:

There is an inherent problem with streaming media. If you set the quality high then there is a greater chance of dropouts so you have to buffer more. If you have packet delays then eventually there is nothing in the buffer and you get a skip.

Problem of buffering. The media stream must be first written to disk. The player then reads the signal, decodes it, and sends it to the sound card. If you want to save the content, then you must capture the signal, encode it, then save it to disk. We have 3 overlapped disk operations. I think you should have a different computer to do the recording. That would reduce the disk accesses at least by 1/3. There should be no problem with a good sound card with a DSP in handling both data streams


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