Topic: feeding the jb3 more than 16/48

[Ed.]

i've read this before plenty of times, but now can't seem to find any of those sources, so i figured I'd ask here.

I've read that you can feed the jb3 a 24/48 signal, it'll still say that its 16/48 but you have to change something in soundforge to get it back to 24/48...how do i go about doing this.  Am I right in my understanding, or am i totally making that up?

ed

[zowie]

No.  You're thinking about feeding it 16/96.

[Ed.]

ok, so then it goes from 24/48 from the ua-5 and the nomad records it at 16/48...thats what i thought but then i remembered reading other stuff, and thats where the confusion came in.

[dklein]

24 bit gets truncated to 16 (whatever sample rate you use)

96k gets recorded with a 48k header - this can be changed to achieve the correct playback speed, but the JB3 can't keep up with the data rate and drops samples.  You'll find glitches in your recording.

I don't know sound forge but you basically want to change the sample rate, not convert it.  The change should occur instantly, without processing.  In Cool Edit Pro, you go edit, adjust sample rate

[drumminj]

Actually, I've had no problems with glitches at 96k on the JB3.  That is, I've not noticed anything audible on the three shows I've recorded at 96k.  I had no "control" to compare it to, however.

[dklein]

I had no "control" to compare it to, however.

Better do that before starting any rumors  

[pfife]

24 bit gets truncated to 16 (whatever sample rate you use)

96k gets recorded with a 48k header - this can be changed to achieve the correct playback speed, but the JB3 can't keep up with the data rate and drops samples.  You'll find glitches in your recording.

I don't know sound forge but you basically want to change the sample rate, not convert it.  The change should occur instantly, without processing.  In Cool Edit Pro, you go edit, adjust sample rate

This is a guess, but I think, in Sound Forge, where it says the sample rate in the lower right corner, you can right click, and select the correct sample rate.

I haven't tried this, but I think that's how you change the sample rate, without resampling.

~AP

[caymanreview]

i accidently recorded one of the first shows i did with the jb3 at 16/96.. and had audible glitches in my recording.... not alot but you could definantly tell

[Ed.]

well i've never sent it a 96khz signal, just 48, i think i'll stick with that.

thanks for all your help

[zowie]

16/96 is kinda silly anyhow.

[rmouk]

So what are the consequences of the JB3 truncuating the 24 bits to 16 bits, ie. 24/48.

What I'm thinking of doing is sending the optical out from my UA-5 to the Nomad, while I experiment with sending the coax out to my IPAQ.  I don't have the IPAQ up and running yet, but I'd love to back it up with the Nomad.

Bob

[Ed.]

i always run 24/48 to it and have the usb going to my lappy with my ua-5, don't really notice anything out of the ordinary - sounds fine at least.

ed

[joemango]

So what are the consequences of the JB3 truncuating the 24 bits to 16 bits, ie. 24/48.

It depends on the d/a converter. it might massage (dither) it so there's no noise, but if it doesn't you'll just lose the extra 8 bits of resolution and your music might come out sounding very slightly metallic or mp3-ish.  Either way it's not tragic, but you want to take full advantage of your equipment for mastering.

You have to drop to 16 bits to put any of it on a CD, plus resample from 48 to 44.1, so the more resolution you have BEFORE you do either, the better your final product.

[rmouk]

I guees maybe I wasn't being clear.  If I'm sending 24/48 from the UA-5, and the JB3 is truncuating the extra eight bits, is that going to effect the sound quality of the JB3 recording?  SpeshulEd says not that he can hear, you say possibly.  It makes sense to me that if you chop off eith bits it will make a difference.

I guess if the JB3 ends up being a backup to the IPAQ, then its not that big of a deal, but I'm not convinced the IPAQ is going to be really reliable right off the bat.

Bob

[Brian Skalinder]

If I'm sending 24/48 from the UA-5, and the JB3 is truncuating the extra eight bits, is that going to effect the sound quality of the JB3 recording?

The answer is:  YES.  The real issue is whether it will be audible to you and everyone else.  This is, of course, highly dependent on each individual's listening experience, ears/brain, playback system, etc.

If you're unsure the Ipaq will be reliable at first, stick with 16-bit until you're comfortable it's stable.  Then make the jump to 24-bit at home testing to see how stable it is.  Or...just fire away at 24-bit and see what happens!  The choice is yours...  

[rmouk]

Thanks Brian.  I was fairly sure that was the case, but was looking for some confirmation from someone more knowledgable then I.

+T for the help!

Bob