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In Reply to: Lossless digital volume controls posted by andy evans on December 3, 2020 at 07:00:45:
This might be more complicated than maybe you expect.Do you mean that your volume control is visually advanced to 80% of its maximum or do you have a readout? That is, how do you know that you are listening at -6dBfs? If it is a subjective estimate this may also depend upon the nominal output level of your source player and input sensitivity of your DAC.
The levels will also vary disc to disc ( or TV show to TV show) according to the maximum level encoded below 0dBfs. So if the engineer has set the maximum level on the recording as -6dBfs then if you wanted also to listen at that level the volume control would need to be set at 0.0dBfs. However as you will not know (without analytic software) where the engineer has set the maximum encoded level you will end up setting volume by ear anyway.
Whether you are running into difficulties with resolution at -6dBfs will, indeed, probably not affect you. The success of this also depends upon how well the truncation is carried out (use of dither etc.). If you needed to attenuate further then the potential point where where any difficulty arises in respect of loss of resolution will depend upon the bit depth available. That is a 16 bit volume control will run out of leeway faster than a 32 bit control.
So, as you will probably have to set volume by ear rather than by calculation,then my personal view is that if it sounds OK then it is OK. If you cannot hear any resolution loss then, as far as you are concerned, there is no resolution loss. With my equipment I know from the manufacturer that resolution loss may start to be be a problem from -26dBfs. Therefore it is advised to keep the volume control above this.However by that level of attenuation with my system the sound is so quiet that I really cannot hear any such loss. It is a relevant factor on paper only.
The only lossless digital volume control that comes to mind is the Leedh processor. However that is a patented proprietary device so its secrets are kept as such. Users seem to like it. Should anybody think of other such devices then they will have my interest.
"We need less, but better" - Dieter Rams
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Follow Ups
- RE: Lossless digital volume controls - PAR 12/3/2016:21:55 12/3/20 (1)
- RE: Lossless digital volume controls - Roseval 02:35:47 12/4/20 (0)
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