Computer Music

Mel’s myth

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The notion of auditory masking phenomena first emerged in 1933, when Bell Labs’ Harvey Fletcher demonstrat­ed that for humans to discern two simultaneo­usly audible frequencie­s, they have to be a certain distance apart. That distance depends on the paired frequencie­s in question, but for practical purposes, the 0-20kHz range can be divided up into 26 very specific bands, within each of which we can only hear one sound at a time. If you play the centre frequency of every band in sequence, a listener will perceive them as equidistan­t from each other. This series was eventually formalised as the Mel (‘melodic’) scale.

By applying the Mel scale to the field of audio signal processing, theoretica­lly, you’re playing perfectly into the, er, hands of the human ear, eliminatin­g what it might hear as clutter – even if only at a subconscio­us level – and slotting everything into its comfort zones. In EQuivocate and Elevate, the Mel scale is adhered to by having every one of their tightly defined bands operating entirely independen­tly of those on either side. Newfangled describe it as “each slider directly tickling a different section of your inner ear”. It’s a novel, ingenious approach that – perhaps unexpected­ly – works brilliantl­y in the real world.

 ??  ?? Both plugins feature three different colour schemes
Both plugins feature three different colour schemes

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