Noise Removal

To show the effect of changing Mono-a-Mono’s “Silence Enhancer” slider, here are a couple of examples. You can click on the graphs to download the corresponding audio files.
Before noise removal
This is a short extract from a stereo recording of “Knock on Wood” by Danny Kaye (the upper panel is the left channel, the lower is the right). As you can see, it’s very noisy, exhibiting no quiet (let alone silent) intervals between notes.

Even with the “Silence Enhancer” slider set to zero, Mono-a-Mono still removes most of the noise. In fact, it’s this setting which gives the closest to mathematically optimal attenuation of any independent noise on left and right channels:
Zero noise removal
In many cases, there’s some noise which is common to both left and right channels. This is not removed when the “Silence Enhancer” slider is set to zero, but can be quite audible during quiet passages. It can be suppressed by increasing the “Silence Enhancer” slider. The example below was produced by setting the slider to full scale (10).
Full noise removal
The quiet periods between individual notes (towards the end of this example) are much quieter as a result of this. The downside is that the rest of the recording is less ‘clear’ and has slightly lower fidelity to the original. In practice, a mid-range “Silence Enhancer” setting provides a good compromise for most recordings, but users who are more concerned about strict fidelity to the original recording may prefer to set it to zero.


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