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24-bit to 16-bit dither question

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RD James:

--- Quote from: partha on March 17, 2018, 03:50:35 pm ---Is there any audible difference in the default dither? Have been reading up a lot about this, and ended up confused so just wanted your view. I am going with triangular by accepted/safe practice, but is the default worth it?

--- End quote ---
I am of the opinion that TPDF should be the default.
The "bit-exact dither" is RPDF which I would not recommend using, as it can distort audibly - especially if you are reducing the bit-depth.

You can hear the effects of this if you start playback in Media Center and enable the "bit-depth simulator" inside the Parametric EQ DSP. Note: do this at a low playback volume.
As you reduce the bit-depth you will hear more and more distortion with dither disabled or set to "bit-exact". TPDF adds more noise but does not distort. This can be changed during playback.

partha:

--- Quote from: RD James on March 17, 2018, 04:08:42 pm ---I am of the opinion that TPDF should be the default.
The "bit-exact dither" is RPDF which I would not recommend using, as it can distort audibly - especially if you are reducing the bit-depth.

You can hear the effects of this if you start playback in Media Center and enable the "bit-depth simulator" inside the Parametric EQ DSP. Note: do this at a low playback volume.
As you reduce the bit-depth you will hear more and more distortion with dither disabled or set to "bit-exact". TPDF adds more noise but does not distort.

--- End quote ---

brilliant. thx. tpdf it is. experimenting with the rectangular dither now just to check if the ears have it...

RD James:

--- Quote from: partha on March 17, 2018, 04:13:40 pm ---brilliant. thx. tpdf it is. experimenting with the rectangular dither now just to check if the ears have it...

--- End quote ---
At very low bit-depths such as 3-bit, it will be very obvious.
At higher bit-depths it is less obvious, but can still be heard at times - particularly with quieter music.
The main difference is that TPDF has a constant noise floor, while the noise floor with RPDF can be modulated by the signal - so you can hear it pulsing or going silent at times in the middle of a track.

partha:
I also want to ask what 'not-zone specific' means when it comes to the dither.

Also, If I have it set to tpdf for the 24-bit files, and suddenly i have to convert a 16-bit file instead, should i turn dither off or will it turn off on its own?

Hendrik:
Dithering is always used properly, you should never turn it off. MC automatically applies the appropriate dithering strength for what you are converting to.

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