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CHP. 8 RECORDING, EXTRACTING, AND BURNING
121
Adjusting for DC offset
The DC adjust check box instructs Sound Forge to compensate for DC offsets generated by your system’s
sound card during recording. A DC offset of approximately 30 dB is not uncommon for sound cards (even
with very low noise floors) and this displays in the record meter as -60 dB. This does not mean that the
system is losing 30 dB of resolution, but for the meters to accurately display ranges to -90 dB, you must
calibrate the
DC adjust.
Calibrating the DC adjustment
Before using the DC adjust feature, you must calibrate it for the selected recording device.
1.
Select the DC adjust check box. The Calibrate button activates along with displays labeled Left and Right.
2.
Click the Calibrate button. Sound Forge listens to the selected recording device, calculates the offset, and
displays the
Left and Right offset values in sample amplitude.
Recalibrating the DC adjustment
If you have multiple sound cards, you should recalibrate the DC adjust each time you select a new recording
device. Certain sound cards must also be recalibrated each time the sample rate changes or when switching
between mono and stereo recording.
Tip:
You can recalibrate at any time, even during recording.
However, it is preferable to perform recalibration with silence
at the record inputs.
DC adjust
Select the DC adjust check box to activate the Calibrate button