DC Adjust & Calibrate in SF6 -Sound Forge - PC - MAGIX Community Forums Archive

Subject:DC Adjust & Calibrate in SF6 Posted by: Pisi Date:2/7/2003 9:54:37 PM Not sure when to use this "Calibrate" option. The help file says "before starting recording." What does that mean? Before starting recording but in the absence of input signal or while input signal is present? Either way, every time I click this button, I get totally different values for "Left" and "Right". What sort of "calibration" is this when these values depend very much on the moment in time I do calibration? Again, the values for "Left" and "Right" I obtain upon clicking the Calibration button seem pretty random. How can one trust this "Calibration" in these conditions? P.S. Is there any way to do this DC adjust after recording (i.e. as part of post-processing)?
Subject:RE: DC Adjust & Calibrate in SF6 Reply by: rjt Date:2/9/2003 7:41:02 AM I have done it after recording, using DC offset in the Process menu. Take Care
Subject:RE: DC Adjust & Calibrate in SF6 Reply by: Bill_Wood Date:2/15/2003 11:28:45 AM The Calibrate button should be pushed before Recording with no audio signal input to remove any residual DC offset from whatever A/D converter you have selected for input. Many low cost audio cards have DC offsets that will cause problems later if not removed. You can also remove DC offsets from recorded files as noted by rjt, but it is best to take them out before recording to minimumize the reduction of dynamic range in the recording. If the varying numbers you get are low (1 to 10 or so) I would not worry. If they are large that means some thing is flaky in the A/D converter in your sound card. Bill

Subject:DC Adjust & Calibrate in SF6

Posted by: Pisi

Date:2/7/2003 9:54:37 PM

Not sure when to use this "Calibrate" option. The help file says "before starting recording." What does that mean? Before starting recording but in the *absence* of input signal or while input signal is *present*? Either way, every time I click this button, I get totally different values for "Left" and "Right". What sort of "calibration" is this when these values depend very much on the moment in time I do calibration? Again, the values for "Left" and "Right" I obtain upon clicking the Calibration button seem pretty random. How can one trust this "Calibration" in these conditions?

P.S. Is there any way to do this DC adjust after recording (i.e. as part of post-processing)?

Subject:RE: DC Adjust & Calibrate in SF6

Reply by: rjt

Date:2/9/2003 7:41:02 AM

I have done it after recording, using DC offset in the Process menu. Take Care

Subject:RE: DC Adjust & Calibrate in SF6

Reply by: Bill_Wood

Date:2/15/2003 11:28:45 AM

The Calibrate button should be pushed before Recording with no audio signal input to remove any residual DC offset from whatever A/D converter you have selected for input. Many low cost audio cards have DC offsets that will cause problems later if not removed. You can also remove DC offsets from recorded files as noted by rjt, but it is best to take them out before recording to minimumize the reduction of dynamic range in the recording.

If the varying numbers you get are low (1 to 10 or so) I would not worry. If they are large that means some thing is flaky in the A/D converter in your sound card.

Bill