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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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Pio2001
post Nov 17 2003, 01:46
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QUOTE (JeanLuc @ Nov 16 2003, 07:09 PM)
So I just can't imagine why an analog signal cannot be attenuated to a non-clipping ADC output in that case ... it is just a matter of voltage

Let's give an example :

Maximum recordable level of the line input : 1 Volt. It clips the 24 bits ADC
Mixer setting : at -12 dB, the full scale of the 24 bits is scaled to the full scale of the digital file output (gain = 1)

In you case : output of your keyboard = 0.5 Volts
ADC : Full scale minus 6 dB
Mixer setting : 0 dB, gain = +12 dB
Result : -6+12=+6 dB
Your file is clipped by 6 dB

Now you lower the mixer setting to -6dB : gain = +6 dB
Result : -6+6=0 dB
Your recording is OK

In our case :
Output of the phono preamp : 2 Volts
ADC : clipped by 6 dB
Mixer setting : 0 dB (gain = +12 dB)
Result : 6 dB clipping, then 12 more dB clipping.

We lower the mixer setting at -24 dB (gain = -12 dB)
Result : 6 dB clipping remapped to -12 dB, like in the first picture at the top of this thread.
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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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