Sonnox Oxford Restore - Manual (Page 29)

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Left and Right channels to a bus called Mid, and sending the Left and the phase inverted version
of the Right to a bus called Side.
Likewise, you can convert a Mid-Side pair of channels into Left and Right by adding the two
together to make the Left, and Subtracting the Side from the Mid to make the Right:
Left = Mid + Side
Right = Mid - Side
Although it is possible to convert from Mid-Side to Left-Right and vice versa, signals that are
intended for broadcast should be recorded using the Mid-Side microphone technique, which
ensures there is no actual left-right phase difference.
The Oxford DeNoiser has a Mid-Side mode of operation that causes the plug-in to de-noise only
the Side signal content of the Left-Right signal, leaving the Mid content alone. The Left-Right
signal is first converted to Mid-Side, then the Side is de-noised, then the signal is converted back
to Left-Right.
If you have a recording that is already in Mid-Side format, you can simply de-noise the side
channel as a mono signal. But if the Mid-Side recording has been converted to Left-Right, you
need to use the Mid-Side mode of the DeNoiser to de-noise just the side contents.
To de-noise just the Side channel is useful in two circumstances. Firstly, for FM stereo
broadcast, switching between stereo and mono modes as signal strength wanes should not cause
a noticeable change in dominant noise content. DeNoising only the Side channel means that
mono operation is entirely unaffected while stereo operation produces a cleaner stereo image
without affecting the central sound. Secondly, recordings made with the Mid-Side microphone
technique often have more noticeable noise in the Side signal because the Side signal is mainly
ambiance. If the Mid-Side recording is then converted to Left /Right at some point, the Mid-Side
mode of the DeNoiser allows you to de-noise just the Side content.
5.7
Description of Controls
Touch Pad Controls
Several controls in these plug-ins use a Touch Pad associated with a knob or slider. These
controls give a clear display of the SI value of a control, and respond to the following actions:
- Left-Click and drag up/down: Increase/decrease the value
- Right-Click and drag up/down: Fine adjustment of value
- Double Click: Directly edit value
- Shift + Left-Click and drag up/down: Fine adjustment of value
- Control + Left-Click: Set to default