Martin Audio ENGINEER Guia do Utilizador descarregar pdf (Página 53)

Engineer 418 & 818 User Manual Page 53

The big picture

Before attempting to configure the algorithm, let’s take a look at the main parameters that will come into play.

The figure above gives us an idea of the problem to solve and the tools at our disposal: The blue line

represents the input volume offered to the algorithm; the red line depicts the overall volume we would like as

the output volume.

The goal is to modify our input volume in a way it will be in between the orange lines marked “Tolerance” by

the time we’re done. The tolerance can be set as an offset to the desired target level. If our virtual sound

engineer has low tolerance, he’ll try to match the target level as accurately as he can: The higher the tolerance,

the more slack will be allowed in the source level.

But when to intervene? Sometimes the source level will only be outside of the target area for a short time. The

maximum amount of time this is allowed to happen is set by the reaction time. Setting this to a short period of

time will result in a nervous engineer, turning the knobs as soon as the volume deviates from the target we’ve

set: The longer the reaction time, the more “lazy” our engineer will become.

You might be thinking you’ll want to set the reaction time as short as possible to counter sudden peaks in the

volume, but there’s no need: Sudden peaks in the source volume are countered by three limiters (low-, mid-

and high tones). The purple line marked “headroom” shows us the maximum level at which these peaks are

allowed before these limiters kick in.

Finally, we need to account for situations in which no music is being played. A human engineer wouldn’t turn

up the level to 10 when there’s (almost) no input, so neither will ours. You can set the minimum level he’ll

work with; it’s called the threshold and marked in green in the figure above. If the input level’s below the

threshold, the engineer will sit back and relax: All knobs will be set to 0, leaving the source signal unchanged.

Now that we have an idea of what we’ll be configuring, let’s get started!

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Martin Audio ENGINEER Guia do Utilizador Página 53