iZotope 64-Bit SRC

You can use the iZotope 64-Bit SRC process to change the sample rate of an existing sound file.

1.From the Process menu, choose Resample, and then choose iZotope 64-Bit SRC from the submenu. The iZotope 64-Bit DSRC dialog is displayed.

2.Choose a setting from the Preset drop-down list, or adjust the controls as needed.

Item

Description

New sample rate

Specify the sample rate to which the sound file will be converted.

 

Note: Increasing a file’s sample rate cannot improve the quality of the existing

 

audio, but does allow higher resolution for processing.

 

 

Quality

When the Use simplified Quality setting check box is selected, you can drag the

 

Quality slider to adjust the plug-in’s controls automatically.

 

Dragging the slider sets the balance of audio quality vs. processing speed. A setting of

 

50% works well for most applications. Increasing the setting improves the quality of

 

the plug-in but requires more processing power.

 

When the Use simplified Quality setting check box is cleared, you can adjust the

 

plug-in’s controls manually.

 

 

Steepness

The plug-in uses a low-pass filter to discard frequencies that cannot be represented or

 

are undesirable in your audio output.

 

This setting establishes the steepness of the transition band of the low-pass filter.

 

Higher settings will reject unwanted frequencies, but can cause more ringing in the

 

time domain and a higher CPU load.

 

 

Max filter length

Sets the maximum length of the filters used for resampling.

 

The default setting will work well for most applications, but you can increase the

 

setting if very high-quality output is desired for uncommon source or destination

 

sampling rates.

 

 

Cutoff scaling

Allows you to scale the cutoff frequency of the plug-in’s low-pass filter from the

 

Nyquist frequency.

 

Typical values are near 1. Higher values will offer a flatter pass-band, and lower values

 

will offer better aliasing suppression.

 

 

Alias suppression

Sets the amount of suppression in the low-pass filter’s stop-band. Frequencies in the

 

stop-band that are not fully attenuated will result in aliasing.Higher settings will result

 

in better quality, and lower settings can minimize CPU load.

 

 

PROCESSING AUDIO 191