MeldaProduction MStereoSpread Bedienungsanleitung

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MStereoSpread

MStereoSpread is a unique artificial stereo generator. It implements 2 algorithms, the first a high-end spectral algorithm, which is preferred

and provides unbeatable audio quality, and the second a fairly common algorithm based on comb-filtering. You can use either one or both of

them at the same time. The plugin also provides additional controls such as a stereo width knob, and a stereo field analyzer.

Basics of stereo field psychoacoustics

A healthy human possesses two ears and since birth, our brain has been using them to learn to identify different sounds and their origins.

After years of practice we are able to identify sounds inside whole mixes and estimate the direction and distance to the sound origin with

surprising accuracy. We are even able to guess the size and type of the room we are in. All of this done using just our two ears, both of

which are essentially just one dimensional.

The invention of stereo audio gives a mixing engineer unprecedented possibilities, which are way beyond the basic panorama. The fact that

our brain can extract different parts of a mix gives us another two dimensions which we can use to make a mix "clear". A mixing engineer's

task is to make the listener understand the mix easily and let them focus on what is important without actually thinking about it and

analysing the audio. Here we'll discuss the basic clues that our brain uses to identify the origin and explain why and how we can take

advantage of these clues.

Left or right

When an audio source is on the left side, it is natural that you will hear it first using your left ear, then you will probably get some reflections

and resonances from your skull to your right ear. Note that this makes perfect sense, yet most people still use a panorama control to make

a sound come from the left side! In the real world that's something that would only happen in an anechoic chamber with a dampening

device attached to your head! It may sound acceptable when using monitors, because the environment actually creates the reflections for

you and the skull resonances are again present, but it just doesn't sound natural with headphones. However the majority of us use

headphones every day so it is essential to learn to simulate direction using more advanced techniques.

To summarise: Sounds coming from our left side occur first in our left ear and then get slightly delayed, lowered/attenuated, filtered in our

right ear and are followed by a set of reflections. It is usually not necessary to simulate the reflections and the filtering cannot actually be

simulated, because every skull is different. So all that is needed is to delay the right channel and attenuate it slightly. This is usually called a

Haas delay.

Direction

Things get more complicated when the audio is not coming from completely left or right, but from any angle around you. This is where the

ear filter comes in. When you look at an ear, you may wonder why it has such a weird shape. The interesting thing about this is that it

actually looks different from every angle. And it also changes the sound from every direction differently . We can actually simulate this, by

placing a tiny microphone into our ear, recording impulse responses from different angles and then use these to convolve any audio with it

to make it sound like "it originated from there". Unfortunately tests have shown that each person has different ears and after the years the

brain has taken to adjust to them, using a 'different person's ears' doesn't work very well.

So how can we simulate a sound coming from say 45 degrees to your left, and 60 degrees above you? Well, it seems that we cannot do that

effectively using just 2 channels. After all it wouldn't work with monitors anyway, only in headphones. Luckily for us, we don't really need

vertical placement, and a Haas delay seems to be enough to make a sound originate from in front of us from any horizontal angle.

Distance - how to make a sound appear further away

A sense of distance is much more useful and interesting and it can even be partly applied to monophonic audio too. First, is the air

absorption of higher frequencies - sounds originating from a longer distance have substantially lower levels of higher frequencies, because

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