Gale Andrews wrote:How does the DeNoise tone sound after processing? Is it much less artefacted? I agree we should be worrying about real life samples more than tone artefacts.
kozikowski wrote:I wonder how that other package is doing it's work.
The DeNoise application works in the frequency domain, dividing the incoming audio stream into
80 overlapping frames per second, and transforming each such frame into 1024 equally spaced fre-
quency bands (2048 if the sample rate exceeds 48 kHz).
For sound sampled at the CD rate – 44.1 kHz – this means that each band has a width of 22Hz. From
about 200Hz this enables fine-grained processing; however it is not satisfactory for the treatment of
rumble, hum, and the like. This is the reason for the development of a separate application (De-
NoiseLF) for the treatment of low-frequency noise.
Most readers will be familiar with the operation of graphic equalizers. Normally they are restricted
to no more than 30 bands, and they are adjusted infrequently. DeNoise operates as a type of “intel-
ligent” graphic equalizer. There are 1024 (or even 2048) frequency bands, and the incoming audio is
processed in overlapping frames at the rate of 80 frames per second. The gain in each of the bands
is adjusted continuously from frame to frame, using algorithms which attempt to judge what would
be perceived as noise, and what would be perceived as desirable audio. The objective is to suppress
the former without doing perceptible damage to the latter.
stevethefiddle wrote:There is also another bug in Noise Removal (1.3.13 alpha):
The Sensitivity and Attack/Decay sliders do not respond correctly to keyboard control. (tested on Linux only)
..using algorithms which attempt to judge what would
be perceived as noise, and what would be perceived as desirable audio...
Exactly. That would be McDonalds "Secret Sauce," the Coca Cola ingredient locked in a vault in Atlanta, etc.
And yes, without that, you have Tesco/7-Eleven microwave burgers and off-brand tap cola.
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