Subject:Recording at 48khz 16-bit??

Posted by: buckaroo

Date:2/13/2013 4:14:33 AM

I am producing my music on a Mac and have a seperate PC for Sound Forge as my recorder and editor.

This pc has a MOTU 828mk2 attached and records 'in" via the SPDIF optical for pristine digital 2 track stereo signal into SF.

I use SF 8.0 and S.F 5.0

Is it easy enough to record in via SPDIF but at 48Khz as my recordings meed to be 48/16

Sorry for the dumb question but just thought i'd ask or is there a way to convert this with no artifacts to 48khz? in SF

Subject:RE: Recording at 48khz 16-bit??

Reply by: Chienworks

Date:2/13/2013 5:28:14 AM

I think we need some clarification. It sounds like you're needing to convert 48KHz to 48KHz, and the answer to that is that no conversion is necessary since you're already there.

However, if you do need a sample rate converter, Sound Forge's built in one is very good when you set it to the highest quality (slowest) setting.

Subject:RE: Recording at 48khz 16-bit??

Reply by: buckaroo

Date:2/13/2013 6:08:14 AM

Sorry yes, I usually have it set to 44.1k and 16 bit

But under the recording > new, it looks like I can set it to 48Khz 16bit

I am recording in via SPDIF so 48Khz should be fine digitally shouldnt it?

Subject:RE: Recording at 48khz 16-bit??

Reply by: rraud

Date:2/13/2013 9:38:57 AM

But under the recording > new, it looks like I can set it to 48Khz 16bit
-- Haven't used a S/PDIF in a while, but as I recall whatever your sound card's internal rate setting is will be the sample rate of the ingested audio.

I am recording in via SPDIF so 48Khz should be fine digitally shouldnt it?
-- Yes, but if it's final destination is CD, 44.1 would be better.. in which if 48k, the file would need to be down sampled at some point. The sonic difference between 44.1 and 48k is negligible.

Subject:RE: Recording at 48khz 16-bit??

Reply by: buckaroo

Date:2/13/2013 10:51:49 AM

No this is for TV / DVD so 48Khz is whats needed :)

Subject:RE: Recording at 48khz 16-bit??

Reply by: Geoff_Wood

Date:2/14/2013 4:06:51 AM

Depending on your soundcard driver, I would expect that you MUST have the record SR same as the SPDIF stream coming in, or you would get an error code, or massive distortion.

geoff

Subject:RE: Recording at 48khz 16-bit??

Reply by: buckaroo

Date:2/14/2013 5:36:53 AM

Great thanks

So If i recorded via SPDIF at the usual 44.1Khz and 16-bit I can use the Resample tool (which I've just discovered!!) and resample the audio to 48Khz 16bit and its done??

Is it that simple?? ;-)

Subject:RE: Recording at 48khz 16-bit??

Reply by: rraud

Date:2/14/2013 9:56:37 AM

"I can use the Resample tool (which I've just discovered!!) and resample the audio to 48Khz 16bit and its done??.... Is it that simple??"
-- Yes, but why not ingest @ 48K in the first place (if your S/PDIF device supports it)
FWIW, Vegas can work with mixed/different sample rate audio, and would automatically re-sample to 48k upon render, if the audio properties are set to 48k.

Subject:RE: Recording at 48khz 16-bit??

Reply by: roblesinge

Date:2/14/2013 11:33:49 AM

I think OP is referring to stuff he's already recorded at 44.1k by accident, maybe? And, yes, upsampling should have no negative effects.

Rob.

Subject:RE: Recording at 48khz 16-bit??

Reply by: musicvid10

Date:2/14/2013 10:11:26 PM

All Sony products do a superb job of upsampling 16/44 to 16/48. It cannot be lossless because of dithering / antialiasing applied. But I know of no one who could tell upsampled from native 48KHz "by ear." I personally can detect no Q-noise from the conversion, and I am particularly sensitive in that area.

Subject:RE: Recording at 48khz 16-bit??

Reply by: buckaroo

Date:2/15/2013 3:17:24 AM

Yes your right as i'm the OP, I recorded at 44.1Khz and want to upsample to 48Khz..

Trying the 'resample' feature, it seems brilliant for this job!

As Im new to this, I had the interpolation on High (4) and ticked the "Anti Alias Filter"

What exactly does the sample rate (do not resample) mean? Is this for even better quality?

Sorry for my ignorance as a newbie! :)

Subject:RE: Recording at 48khz 16-bit??

Reply by: ChristoC

Date:2/15/2013 3:28:55 AM

> What exactly does the sample rate (do not resample) mean?

It actually says "Set the sample rate only (do not resample)." whilst the popup is open click on the ? symbol in the top right corner.... all will reveal itself!
With that option selected the samplerate will only be changed in the file header, but the file will not be resampled therefore will just subsequently played faster or slower (depending if you raised or lowered the samplerate) therefore pitch will not be preserved. This is usually desirable in special circumstances...

Subject:RE: Recording at 48khz 16-bit??

Reply by: rraud

Date:2/15/2013 1:39:41 PM

"What exactly does the sample rate (do not resample) mean? "
Yes, as ChristoC stated.. speed/pitch change. A similar result to speeding up.. or slowing down, tape machine playback (if anyone remembers those 'antiques')