Bouncing 44.1 kHz and 96 kHz projects to the same destination?

Hi,

Let's see if I understand you. You have some projects in 44.1 kHz, and some in 96 kHz, right?
When you hit the bounce button in Logic, nothing will happen to the audio data of your project. Logic will just export your song to one new audio file.
Do you want to make an audio CD of these songs?? Simply use iTunes or another program capable of burning an audio CD to put the bounce files of all songs to a CD.
If you want to backup your projects, you'll need to make a data CD, and burn the project folders of your songs onto the CD. You can use the Finder to do that (using a burn folder). See this info:
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh854.html
Mind you, Logic projects are big, so maybe 1 project is already too large for a CD. You may need to use DVD's. For backup purposes I personally prefer a cheap USB2 external harddisk.
Regards,
Jaap

Logic will convert for you, from 96K to 44.1K, if you tell it to when you bounce. I use Toast Titanium to burn bounces to CD, and I sometimes will let it handle the conversion from 96K or 48K down to 44.1K, or I'll use Peak to convert to 44.1.

The key is if you record at 24 bit, you just don't want to toss away those 8 bits when going down from 24 to 16 bits. You want to make sure you use dithering (pow-r 2 or 3) when converting bit depth. Logic can do that for you also, or an external program like Peak. I'm not sure if iTunes can convert 24/96K down to 16/44.1, and if it does, if it uses dithering or not. I notice a bigger difference going from 24 bit to 16 (especially if no dithering is used), than going from 24 bit/96K to 24 bit/44.1K.

Regards,
Kurt

To start off, some technical information.

An audio cd (Red Book Standard) has a bit depth of 16 bits and a sample rate of 44,1 KHz. If this is something else, CD players won't play your CD. Maby a DVD player can play the disc but don't count on it.

The sample rate stands for the amount of samples per second. See this as the "detail" of the audio. the more samples, the more detail, the better it can sound. But this will all depend ond you equipment (eg. mic, preamp, converter, cables).

Back to your initial question.
No. You can not burn a 96 KHz audio file on a regular (red book) audio cd. It just won't be an audio cd anymore. You might try and create a video DVD to play in your DVD player. They can play up to 24 bits/96 KHz

Also bouncing down in logic is in no way destructive. What is does is create a new (stereo) audio file with the new technical settings you entered in the bounce down menu. Your original stays the same.

If you want to bounce your 96 KHz file down to 44.1 KHz, don't do this via ITunes, use logic for this. Use dither when doing so, also try out different dither types to find the one that suits your music best.

Further, the bit depth. 24 bit VS 16 bit. Their is no sound difference between them. Bit depth determines the amount of dynamic range. The difference between the loudest sound and the softest sound. 1 bit = 6 dB. So 16 bit = 96 dB and 24 bit = 144 dB (to be exact: 1 bit = 6.02 dB)

When recording it is wise to use 24 bit because of the headroom. The signal does't have to be recorded "hot" leaving room for peaks without distortion.

When bouncing from 24 to 16 bit, dither makes sure that the volume of loudness of the mix element get's transferred onto the new 16 bit "grid" as best as possible.

And for playback on a cd player, a cd player has a dynamic range of 96 dB (16 bits).

So in short: for a cd, bounce everything down to 16 bit/44.1 KHz. You can keep the 24 bit/96 KHz file but then burn it on a video DVD and play it back via your DVD player. Toast has and easy option to do so.
And when bouncing, your original file will stay just as it was.

(I tried to make this post as logical sounding as possible, if not, let me know.)

Hi Raven and hi to all. Thank you for your helpful and easy to understand stuff. (I've spend many times on the net with too many opinions about, but, now...;)
Ok, starting...

The hires audio (24/96...192) is NOT CD stuff but maybe DVD and for sure PC stuff: if I burn a CD with data (also with iTunes) 24/96 .AIFF for instance, what kind of device (exluding the PC with iTunes or Win. media player) will read this music? DVD player? New iPod? Something in the hiend area like some CD transports?


Thank you agan, Luca

...today I have found on the net (Apogee forum) that USB (protocol) can drive maximum 16bit/32-44-48 kHz...

So?

(Sorry for double post...ahemmm..triple...I don't find the edit mode...)
Anyway: USB2.0 seems good to drive 24/96 (bandwidth) but maybe firewire is the best, but DAC?