24 bit 44.1 to 48k?

[dan p]

I have 24 bit 44.1aif files that need to be converted to 48k files.
Whats the best way to do this?
Thanx!


Dan P

[Cellotron]

With a good sample rate converter.

You can see a site with good comparison charts of many widely available src's at SRC Comparisons

One src that tests out to be one of the best is available as a cross platform freeware command line app at SoX - Sound eXchange | HomePage

Best regards,
Steve Berson

[j_j]

Originally Posted by karyoky****

hi,

your other option is to simply re-record the material using good equipment [i.e. play the 44.1/24 files out analog and simply record them at 48kHz/whatever].

Why would he do that, though?

[Waltz Mastering]

Originally Posted by j_j

Why would he do that, though?

If he planned on doing any analog processing and had a separate capture daw, it would avoid a src all together.

[dan p]

Thanks for the responses mates!
I like the mixes I have.
I need to convert my files so I can upload them to a company that does broadcast 48khz
aif's for film and tv from their library.
I checked out the soundXchange and i'll go back there and read up some more.
Thanks Steve Berson for the heads up.
Be best to have a program that just converts to what i need without re-recording

Best Regards

Dan P

[maxpidge]

Originally Posted by dan p

I have 24 bit 44.1aif files that need to be converted to 48k files.
Whats the best way to do this?
Thanx!


Dan P

what software do you record on???

if protools just import into a new 48/24 session then re-export...

[Cellotron]

Originally Posted by karyoky****

hi,

because it may sound as good or better than trying to sample rate convert from 48kHz to 44.1kHz and, possibly, dither from 24 bit to 16 bit [he didn't say what the destination bit depth was].

even if he doesn't have to do the word length reduction, it still could sound as good, maybe better.

just an option.

i'm guessing you prefer src?

Generally with the best of the batch of current src algorithms a round of DAC to ADC will color the audio slightly more than using a good src. So if you're trying to keep the mix as intact as possible then using a good src will usually do the trick the best out of current options. Generally you need to make sure your file has a little bit of headroom (a few tenths below 0dBFs usually suffices) prior to src though.

I agree with Tom Waltz that if you are planning on doing any analog processing then the best way is just to play the file out at source rate and capture back at your intended delivery rate as you suggested though.

Best regards,
Steve Berson

[Cellotron]

Originally Posted by dan p

Thanks for the responses mates!
I like the mixes I have.
I need to convert my files so I can upload them to a company that does broadcast 48khz
aif's for film and tv from their library.
I checked out the soundXchange and i'll go back there and read up some more.
Thanks Steve Berson for the heads up.
Be best to have a program that just converts to what i need without re-recording

Best Regards

Dan P

SoX is definitely not user friendly by any means - so if you need a decent batch converter that is a bit easier to use Voxengo's r8brain Pro is another good option - Professional sample rate converter software - r8brain PRO - Voxengo
SoX does spec out better than r8brain Pro in the src.infinitewave.ca tests of it though.

Best regards,
Steve Berson

[Cellotron]

Originally Posted by karyoky****

hi,

i hear you, but there are no hard and fast rules, in my opinion. if you are using the best of the best in either scenario, the results will probably be nearly equivalent. recording it again can be the better option. it does allow you to tend to any level changes in the analog domain.

for the original poster, everyone always likes saracon [either hardware or software] for sample rate conversion. i think the software version will run on either platform.

fwiw - SoX - freeware - amazingly tests out to be in the same general level of high quality of conversion as Saracon - street price $900 - does. There are definitely subjective differences that might make one person prefer one over the other though.

Best regards,
Steve Berson

[jayfrigo]

The days of needing an outboard loop to change sample rate are gone. Still, if you're doing mastering processing analog, you can sometimes kill two birds with one stone. However, if it's straight SRC, just use a good one and don't look back.

There are indeed bad SRCs out there, but also several good ones that are cheap and easy to find. The Weiss Saracon is definitely the big daddy, but the iZotope is a close second for a lot less cash. You can find the algorithm in many places, like audiofile-engineering's $75 sample manager. In different implementations you get access to more or less of the features, such as the filter slopes and phase response (allowing you to balance aliasing and pre-ringing, and in certain settings to get closer to the Weiss approach), but even in it's default state, it's among the best.

[aleatoric]

Buy Sample Manager from Audiofile Engineering for $79 and use Izotopes high quality SRC to convert the files to 48khz. However, if you are planning to master the music with outboard analog gear simply capture at 48khz after the analog processing.

[dan p]

Originally Posted by aleatoric

Buy Sample Manager from Audiofile Engineering for $79 and use Izotopes high quality SRC to convert the files to 48khz. However, if you are planning to master the music with outboard analog gear simply capture at 48khz after the analog processing.

Yep!This looks like it will do the trick and not expensive!
For those who want to know,i record in dp5.13 and then created wav's that were mixed in nuendo,mastered in Steinberg wavlabs.I'm happy with the mixes as is!
My goal is to click the file;convert to 48khz and upload via ftp to website.
Should i dither to 16 bit 48k from my 44.1/24bit files?Not sure about this!
I'll certainly check each file to make sure things are the same sound and time wise,just a dif sample rate as the final product.
Thanks for all the responses GS mates!

Best;
Dan P

[maxpidge]

Originally Posted by maxpidge

what software do you record on???

if protools just import into a new 48/24 session then re-export...

GREAT IDEA, why didn't i think of that!!!!

[macc]

Originally Posted by Cellotron

SoX is definitely not user friendly by any means - so if you need a decent batch converter that is a bit easier to use Voxengo's r8brain Pro is another good option - Professional sample rate converter software - r8brain PRO - Voxengo
SoX does spec out better than r8brain Pro in the src.infinitewave.ca tests of it though.

Best regards,
Steve Berson

I'm a massive SoX fan. All you need to do is configure it once and then drop the batch onto a shortcut on your desktop or whatever. On the occasion you need a different destination rate, it's a small edit. Fantastic app.

[Lackatee]

Anyone find it funny that the R8brain free version appears to be better then the pro version by looking at the data?

Some of those conversions look like artwork.. Heh! Id be scared to use anything other then SoX, Izotope RX or R8brain after looking at those charts.. No filter on the transition in Ableton Live 7?? Ouch! Looks like everyones comin to that party! Not that youd be using that for conversion..

[Table Of Tone]

Originally Posted by dan p

Thanks for the responses mates!
I like the mixes I have.
I need to convert my files so I can upload them to a company that does broadcast 48khz
aif's for film and tv from their library.
I checked out the soundXchange and i'll go back there and read up some more.
Thanks Steve Berson for the heads up.
Be best to have a program that just converts to what i need without re-recording

Best Regards

Dan P

Yep!
That's the usual reason for needing 48k versions.
The izotope SRC is the best I've come across.

Having said that, I always use two systems and never use SRC myself.
I tried just using one system but went back to two because I could still hear artifacts!

[dan p]

Originally Posted by karyoky****

hi,

hmm, based on what you just posted, what you might want to check on is whether or not you actually have 24 bit files.

are you saying somebody mastered your stuff to 44.1/24?

are you sure its not 44.1kHz / 16 bit?

All of the files were 44.1/24 bit files in DP.
Once they were mixed in nuendo i got the masters at 44.1/16bit.


Dan P

[Cellotron]

Originally Posted by Lackatee

Anyone find it funny that the R8brain free version appears to be better then the pro version by looking at the data?

Look at the data apart from just the sweep chart more carefully - the free version is not phase correct, and it's pass band filter starts at a relatively low frequency.

Some of those conversions look like artwork.. Heh! Id be scared to use anything other then SoX, Izotope RX or R8brain after looking at those charts.. No filter on the transition in Ableton Live 7?? Ouch! Looks like everyones comin to that party! Not that youd be using that for conversion..

Yeah - there's some good info on the Infinitewave site. I'm glad they took the time and effort to put it out there.

Best regards,
Steve Berson

[jayfrigo]

Originally Posted by karyoky****

hi,

so if you do it all digitally and you also want to change the level of the files, what do you like to do first, the src or the level change?

Depends on the situation, including starting and target sample rates, and processing required. If you're at 96k, stay there and do all your processing and SRC last (excepting dither to 16 for CD). Non linear processing can see some advantages from higher rates, so if you're doing limiting in mastering, you may want to do it at the higher rate. Level changes are not so dependent on sample rate as word length, so the more bits you have available for the change, the better, and of course dither as appropriate.

[Ecktronic]

Originally Posted by dan p

Yep!This looks like it will do the trick and not expensive!
For those who want to know,i record in dp5.13 and then created wav's that were mixed in nuendo,mastered in Steinberg wavlabs.I'm happy with the mixes as is!
My goal is to click the file;convert to 48khz and upload via ftp to website.
Should i dither to 16 bit 48k from my 44.1/24bit files?Not sure about this!
I'll certainly check each file to make sure things are the same sound and time wise,just a dif sample rate as the final product.
Thanks for all the responses GS mates!

Best;
Dan P

Hi Dan P,
Just use Wavelab to convert from 44.1 to 48, do you have it or were you just using it from a studio?
If you've got it then import a file into Wavelab and then go to "Process" (top of screen) then "Convert sample rate" to 48. Should only take about 10 seconds or so for a 4 min track.

As for the bit rate it depends on what the broadcasters want I'd say.
16bit is the norm for CD but not sure if there is much point in 24bit for radio broadcast really. Just ask them.

Eck (G)

Not sure on the