What is the purpose of the dithering? Do I need?

I understand that the dithering covers apparent audible differences when converting down types of samples, such as PCM 24 bit to 16-bit PCM. However, I edit audio using the following setings:

Format: Wave PCM (*.wav, *.bwf)

Type of sample: 192000 Hz, 32-bit

Bitrate: 24576 Kbps

Format settings: wave non-compressed, Point 64-bit floating (IEEE)

Markers and other metadata included

Big estimates, such as 6 min = 1 GB file sizes

I then open it in iTunes and convert m4a, ALAC in about 1846 Kbps, 192 kHz, 16-bit files.

Whenever I have listen subsampled audio files I've been around, I never noticed an addition of background noise, nor any difference at all, a fortiori all I didn't like.

Should I add dither to my WAV files before exporting their?

Apple iTunes automatically adds the dithering when converting to the ALAC, m4a? If this isn't the case, does?

And if I were to export WAV files as files of low-bit of hearing CS6, I should add dither?

I tend to music remaster to eliminate useless noise which has no acoustic effect. I'd be unsatisified if I added the dithering?

Are there specifications of dithering I can add which is not audible, but serve an important purpose?

Any thoughts are welcome! Thank you!

Steve.KR wrote:

I understand that the dithering covers apparent audible differences when converting down types of samples, such as PCM 24 bit to 16-bit PCM. However, I edit audio using the following setings:

This isn't quite like that. It is all based on statistics, and to do with what happens when you hit the lower part of the dynamic range of a file. This only ever happen with the 16-bit files or less, because they are the ones when it could potentially occur within the range of human hearing. That dither is to obscure the point at which a signal goes from a determined point (about - 96dB) to the digital 'silence' at least the infinite dB. This, in terms of 16-bit is the next step down, and it is quite a leap. By dithering the signal (basically adding noise to it in a very controlled manner) you can not only hide it, but to increase the bit depth apparent through the noise. The full explanation for this is quite complex, and you can do all kinds of things with it - mainly involving the formatting of the noise profile.

This makes a difference? Mainly of reverb tails, it must be said. Do you need it for a 24 - bit signal? No you haven't - it can solve up to lower way to the human ear can. Do you need it when you compress files using an encoder? You should not - the encoder will take care of it, and if it isn't, you probably shouldn't use it!

Tags: Audition

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