Hi Gang...
I haven't done this before or at least I don't remember... :-)
 
I have a project that was recorded at 24/44.1 and I need to make a 24/48 print for the video...
 
Should I dither as I'm changing bit rates? ..Or not?
 
I'm guessing yes and running the mixes now but I have time to re-print if it turns out I shouldn't... (2-1hour sets)
 
Consensus?
 
Thanks

No. You need to dither only when going from a higher bit depth to a lower one. You're just changing the sample rate, which doesn't relate to dithering.

Thanks Craig...
 
I understood that anytime you change sample rate (not bit depth) you were supposed to dither so that the unmatched spaces get slurred with the dithered noise...?
 
Whether going up or down, there are gonna be places where the spaces don't line up...?
 
Do you know of any definitive talks about this I might browse?
 

Keni
Do you know of any definitive talks about this I might browse?

 
Trust me on this one  The links to the audio examples are broken, but the info is there.
 

Anderton

Keni
Do you know of any definitive talks about this I might browse?

 
Trust me on this one  The links to the audio examples are broken, but the info is there.
 

Thanks Craig...
 
I do trust, but I also want to understand, so I'm off to read the link... I can't stream these days so not having the audio examples is just as well...
 

I just read your article... Nicely written as always...
 
I'm truly amazed as it was explained to me very differently... I have been under the belief that it was to deal with the non-aligned spaces when changing sample rate....
 
Your explanation is a whole different understanding... I wonder where I picked up that info?
 
OK... So I've gotta go re-do the fist set.... ;-)
 
Thanks again!
 
 

Dither has never been associated with sample rate.  Its to mask truncation artifacts when you decrease the bit depth.
 
 

Keni
Thanks Craig...
 
I understood that anytime you change sample rate (not bit depth) you were supposed to dither so that the unmatched spaces get slurred with the dithered noise...?
 
Whether going up or down, there are gonna be places where the spaces don't line up...?
 
Do you know of any definitive talks about this I might browse?
 

Nope.
 
You only dither when you change Bit Depth, not Sample Rate.

Thanks Everybody...
 
I was so sure that I understood it but I see I was wrong again! ;-)
 
I'm wondering where I picked up my wrong info? Luckily, this is the first time it actually mattered. Up intil now I hae been dithering to go from 24/48 (or higher) down to 16/44.1 so all is well...
 
...and with your help I avoided making the mistake this time.
 
...and I have learned more!
 
...a very humble and thankful man!
 

John
Its to mask truncation artifacts when you decrease the bit depth.

It doesn't work by masking. If it was to mask the errors you could just add the noise after reducing bit depth.
 
The short answer is that dither randomizes the quantization error so that it ends up sounding like noise instead of distortion.
 
It also preserves anything that might be audible below the noise floor.