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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.

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.

Select the DC adjust check box to activate the Calibrate button

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.

CHP. 8

RECORDING, EXTRACTING, AND BURNING