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RX 11 Manual

Spectral Recovery

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Overview

Spectral Recovery automatically adds missing frequencies to bandwidth-limited speech content and patches holes in the frequency spectrum due to compression artifacts. Spectral Recovery is particularly useful in handling VoIP recordings, from Skype or Zoom, where there is a hard cutoff above which no audio exists and the natural low end may be filtered or reduced.

Controls

Ambience Match user interface

Learn

When Learn is pressed, Spectral Recovery analyzes your selection to determine the suggested values for the high and low cutoff frequencies.

Spectral Patching

When selected, this automatically fills in holes in the spectrogram between the high and low cutoff frequencies by sampling the area around the missing audio. This control is very subtle audibly, but you can see the effect in the Spectrogram.

Low Gain

This sets the level of synthesized low frequency signals below the cutoff.

Low Cutoff

Spectral Recovery synthesizes audio below this frequency and fills the spectral holes above this frequency.

Tip

Try adjusting the low cutoff to just above the fundamental frequency of your speaker for Voice-over-IP material to make it sound more natural.

High Cutoff

Spectral Recovery synthesizes audio above this frequency and fills the spectral holes below this frequency.

High Gain

This sets the level of synthesized high frequency signals above the cutoff.

Render

To apply Spectral Recovery processing to the current selection, click the Render button in the bottom right hand corner of the window.