Quote:
Originally Posted by Jim Lesurf[_2_]
The problem is that real DACs aren't perfect. So when replaying 44.1k a DAC may generate effects which extend well below 22.05kHz.
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Jim,
Even though a DAC or player may use an LED or display to indicate the file format entering the component, isn't it possible the DSP could be upsampling anyway?
Quote:
Originally Posted by Jim Lesurf[_2_]
Simple plots of what single-frequency tones someone can hear don't tell you about what happens when they hear more complicated time varying signals with many components. Look on the web for the work of Oohashi for example. Human hearing is non-linear. Real DACs, etc, are non-linear too. The presence/absence of 'Ultrasonic' components can affect what we perceive. Depends on the circumstances, etc.
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Would I be right in thinking we are all continuously bombarded with frequencies above and below our hearing capabilities, and as such this condition would simply envelope ultrasonic frequencies deliberately introduced to an audio replay system, to the degree we wouldn't experience a difference if those ultrasonic frequencies were absent either? What with memory, my brain manipulating my own high and low pass filters as I concentrate, and the varying noise floor within my listening environment, is it realistic for me to be concerning myself with something imperceptible? I may have just answered my own question. However, whilst I'm not inclined to investigate this further via the web, I would respect your opinion.
Quote:
Originally Posted by Jim Lesurf[_2_]
So the advantage of playing 96k material on a good system is that it tends to shove these problems further away from the regions where they can have an effect on what we hear.
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Handy in the studio for minimising additional noise when utilising multiple effects, but once packaged for replay haven't the benefits already been achieved?
Quote:
Originally Posted by Jim Lesurf[_2_]
And in practice, once you're recorded and processed using 96k/24 there doesn't seem much point in downgrading the result in the age of cheap multi-TB drives.
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Agreed. However, during a time when bitdepths and sampling rates are sold more like commodities rather than formats, shouldn't we point out the same file reduced within reason, to say 16-bit 48kHz, would replay with absolutely no perceptible loss of quality experienced by the listener?
John.
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