And when it has to work harder, you get listening fatigue. Noise floor modulation makes it more difficult for the brain to separate things out into individual entities, so the brain has to work harder to make sense of the music. What people forget, as we take hearing for granted, is that the brain is processing the data from the ears, and separating things out into individual entities, and also putting a placement tag onto that entity. The noise floor modulation problem, means that the brain has greater difficulty separating sounds out into individual entities. Its a bit like one being in a party trying to understand somebody speaking with a lot of noise - your brain has to work harder to understand the voice, and its tiring. These timing errors then interfere with the brains ability to actual perceive the starting and stopping of notes - and when the brain can't easily recognise something, it has to work harder to make sense of what is going on. With timing uncertainty, when the sampled digital data is converted back to a continuous signal, the DAC creates timing errors. Its a brain issue, and is (mostly) down to two technical problems - one being noise floor modulation, one being timing uncertainty.
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