rendering a project full of 16bit/44khz .wav files to 24bit/88khz

troven wrote on 8/28/2001, 4:59 PM
using vegas audio 2.0 i have a number of projects comprised of 16bit 44khz wav files that i need to render out to a 24bit/88khz stereo wav file. when i try this, i get a high pitched whining sound that's almost like feedback.

i'm using a layla24 soundcard but this shouldn't have anything to do with the soundcard since i can actually see that the rendered 24 bit wav forms are wrong.

what am i doing wrong? when i render out to 16/44 they sound perfect.

i really need to get this project done this week so any help would be greatly appreciated!

tr

Comments

troven wrote on 8/29/2001, 8:45 AM
nobody? SF? (bump)
SonyEPM wrote on 8/29/2001, 9:22 AM
I am not reporing this- perhaps a sound card playback issue? What plug-ins are being used?

My repro steps:

Load a 16/44 wav file
Render to 24/88.2
Plays fine, no "feedback", waveform is correct
troven wrote on 8/29/2001, 10:09 AM
well i rendered out the project removing all plugins and it worked normally. (damn)
besides the vegas trackfx (eq and compression) i really only use a lot of waves trueverb version 2.5. are there known issues with this plugin in vegas? are they not capable of outputting 24/88.2?

thanks for getting back.

tr
allon wrote on 8/29/2001, 8:30 PM
why are you rendering this to 24/88?
i dont think it will make it will improve the sound quality.whats most importanat is bit and sample rate when first recorded.
i dont understand the purpose of your conversion.
please elaborate.
-ciao
troven wrote on 10/10/2001, 10:59 PM
because the file is being prepped to be mastered and the longer the digital word length of the file(regardless of how the files were recorded) the higher the resolution of the final pass of mastering. which is why i'm taking the 16/44 file and bumping it to 24/88.
allon wrote on 10/11/2001, 8:57 AM
i wasnt aware of that.
ill check it out.
Ted_H wrote on 10/11/2001, 9:47 AM
I'm not sure why you're using a non-standard sample rate like 88.2KHz. Most hardware/software isn't even going to be able to process the data at that sample rate, which may be why you're getting feedback. The standard sample rate for 24-bit files is 96KHz. Resample to 96KHz and it should play fine. Also, I would tend to agree with allon about resampling to a higher bitrate/sample rate. Doing this conversion won't make any improvement to the sound quality. The word length would be longer, but the resolution wouldn't be any better because you would have 8-bits of null data.

Ted
troven wrote on 10/11/2001, 11:36 AM
>>The standard sample rate for 24-bit files is 96KHz

i'm aware that there will be no difference from just rendering to 24/88 but since this file has more digital editing to come (the mastering process) the file will benefit in the long run if these operations are performed at 24/88 and then dithered back down to 16 bit as the final process.

WRT to 88.2 vs 96 i agree, 96 is much more standard but if the original file is is at 44.1 then it's much better to simply double the sample rate to 88.2 than to try and multiply by 2.17 or whatever... the math is awkward and can introduce errors. that's why 88.2 even exists IMHO. also, the 88.2 file doesn't need to play anywhere except the mastering engineers system so i'm not that concerned with compatibility.

the reason i was getting feedback is because my version of waves trueverb (2.5) doesn't support 24 bits.
Rednroll wrote on 10/11/2001, 2:13 PM
Yeah, I remember those days of having to master in 16 bit 44.1Khz and how that technology is so, old school now. I don't know how anyone can even listen to that 96dB's of signal to noise ratio in a 16 bit system and only be able to reproduce frequencies up to 22Khz. I was thinking about doing all my mastering in 24/96 now, but I said hey, I'll do one more better than that. I now master with all analog gear and stay away from that digital realm until I have to goto it, like putting it on CD. Analog has Infinite bit depth and infinite sampling frequency. Infinite is much higher than that aweful sounding low resolution 24/96 you guys are using. I don't have any quantization errors, no digital distortion issues, no word clock/sync issues, no mismatched sampling frequencies. The word length is infinite....you can't get a bigger word length than me with my analog system!!! My recommendation for you, would be not to render and just play it back and record to a cassette and bring that to your mastering engineer. He will be highly impressed with your knowledge of using such a big word length and an infinite sampling frequency. You might want to call ahead first and make sure his 24/96 old school system has this capability though.