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Recording line in with Soundforge, and Audiophile 24/96
evereux
post Aug 10 2003, 10:34
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I'm having a problem recording the output from my CD player through the line in of my soundcard, the Midiman Audiophile (Window's XP).

The problem is distortion. I can't seem to find a way to attenuate the line level input in soundforge and this is causing clipping.

I'm beginning to wonder if this can be removed since during normal playback (through PC) I also get audible clipping, even when the line in is attenuated using Midiman's control panel. I suspect the Midiman doesn't like the output levels of my CD player?

I'm quite sure the input signal itself isn't a problem since playback direct through my amplifier reveals no clipping.

Any ideas?


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AndyH-ha
post Apr 21 2006, 20:20
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I have to admit I have not read this very closely, but it seems there are some ideas that, in some sense the source equipment, or the soundcards, are not quite proper. I just want to point out that adjusting the input level is not a soundcard job and adjusting the output level is not normally a source device job.

I can't speak to what those gaming-multimedia cards might or might not do, but any kind of professional or semi-pro line level input expects a controlled line level input -- it is supposed to already be correct when it reaches the soundcard. Microphone preamps have a gain control, and that can be sufficient for microphone input, but phono preamps, CD player and tape deck line-outs, or any other such sources, do not normally have this control potential. Certainly it can exist as an add-on but it is not part of the normal ‘definition' of the source.

Analogue mixers are the standard professional method of controlling the signal level. Microphone preamps are also most commonly run throug mixers on their way to wherever they will be used or recorded. Mixers can often do quite a few different things. The part that is relevant here is the line level preamplifier. Any line level preamp can be used in exactly the same way but HiFi line level preamps are generally far more expensive than basic mixers and, for this kind of use, provide nothing significant for all that extra money. Of course, full featured, many channeled professional mixers can be very expensive, but ones that give full control, and very good results, with two channels are widely available and not terribly expensive.
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Pio2001
post Apr 23 2006, 03:26
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QUOTE (AndyH-ha @ Apr 21 2006, 09:20 PM) *
I just want to point out that adjusting the input level is not a soundcard job


Yes it is. And nearly all soundcards do it, with the volume control of their "record mixer". In the same way, all tape decks can adjust the recording level. Some of them manually, with a volume control, and some of them automatically, with a built-in dynamics compressor.

The problem is the headroom available. According to this discussion ( http://www.audioasylum.com/forums/pro/messages/9971.html ), the usual headroom in line inputs is around 20 or 25 dB. It means that they clip around 3 or 6 Volts. Soundcard seem to clip lower. This is just an indication of a poor performance, but it can completely prevent their use in some cases.
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Posts in this topic
- evereux   Recording line in with Soundforge   Aug 10 2003, 10:34
- - Pio2001   The line in level is not in Soundforge, it must be...   Aug 10 2003, 18:01
- - evereux   QUOTE If it is reduced, but is still clipped It i...   Aug 10 2003, 19:25
- - Pio2001   I think the solution is to find the line in record...   Aug 10 2003, 21:40
- - ancl   I have an Audiophile 24/96 myself, and as far as i...   Aug 11 2003, 00:01
- - Pio2001   ¿ WTF ?! I'm not going to get rid of my...   Aug 11 2003, 11:40
- - Brajanath   Hi, I'm new here (just started yesterday), an...   Nov 16 2003, 05:38
- - fewtch   QUOTE (Brajanath @ Nov 15 2003, 09:38 PM)My w...   Nov 16 2003, 08:39
- - Pio2001   QUOTE (Brajanath @ Nov 16 2003, 05:38 AM)Befo...   Nov 16 2003, 16:22
- - Brajanath   Your message is perfectly OK. I have not had the ...   Nov 16 2003, 16:56
- - Pio2001   I don't know... The problem with the cassette ...   Nov 16 2003, 17:10
- - Brajanath   QUOTE (fewtch @ Nov 15 2003, 11:39 PM)Not rea...   Nov 16 2003, 17:20
- - fewtch   QUOTE (Brajanath @ Nov 16 2003, 09:20 AM)QUOT...   Nov 16 2003, 17:53
- - JeanLuc   Of course you can adjust input sensitivity with th...   Nov 16 2003, 18:07
- - fewtch   QUOTE (JeanLuc @ Nov 16 2003, 10:07 AM)Of cou...   Nov 16 2003, 18:16
- - JeanLuc   It is the HW mixer which is situated besides the ...   Nov 16 2003, 18:25
- - Pio2001   QUOTE (fewtch @ Nov 16 2003, 05:53 PM)I don...   Nov 16 2003, 18:50
- - ancl   QUOTE (JeanLuc @ Nov 16 2003, 07:25 PM)It is ...   Nov 16 2003, 18:52
- - JeanLuc   QUOTE (ancl @ Nov 16 2003, 05:52 PM)I guess w...   Nov 16 2003, 18:55
- - ancl   QUOTE (JeanLuc @ Nov 16 2003, 07:55 PM)QUOTE ...   Nov 16 2003, 19:01
- - JeanLuc   QUOTE (ancl @ Nov 16 2003, 06:01 PM)You can, ...   Nov 16 2003, 19:09
- - Brajanath   QUOTE (Pio2001 @ Nov 16 2003, 09:50 AM)QUOTE ...   Nov 16 2003, 22:54
- - fewtch   QUOTE (Brajanath @ Nov 16 2003, 02:54 PM)My o...   Nov 16 2003, 23:22
- - Pio2001   QUOTE (JeanLuc @ Nov 16 2003, 07:09 PM)So I j...   Nov 17 2003, 01:46
- - Kos   Thiis is probably very banale for you in here, but...   Apr 21 2006, 09:56
- - AndyH-ha   I have to admit I have not read this very closely,...   Apr 21 2006, 20:20
|- - Pio2001   QUOTE (AndyH-ha @ Apr 21 2006, 09:20...   Apr 23 2006, 03:26
- - AndyH-ha   No that is incorrect. Some of those that use the W...   Apr 23 2006, 10:53
|- - Pio2001   I don't follow you. You are making a distinct...   Apr 24 2006, 19:43
- - AndyH-ha   Most analogue volume controls are passive. Potenti...   Apr 25 2006, 05:39


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