Support Head-Fi.org by
starting all of your
Amazon.com shopping by
clicking here.
____________________________________________________________________
Today's Featured Head-Fi Blog: Jude's Blog
____________________________________________________________________
Please help
support Head-Fi by becoming a Contributing Member
CLICK
HERE -- Contributing Members, thank you
for your generous support! --
Yes, but the original file is a perfect sine wave when played back, the one upsampled by Adobe Audition is too but the one upsampled linearly isn't. The program shows you what you actually hear. Linear connections between each sample don't represent the real world.
No, the original is not a perfect sine wave. I just told you that the program is interpolating the waveform when it displays it. The dots are the sample points. The wavy lines in between, which make it look like a sine wave, are placed there by Audition and are not part of the original data.
Ofcourse, when the original file is played back it will look like a sine wave, because your DAC has a filter. The purpose of this thread is to avoid that sound.
Open the same file using Wavosaur (free), and take a look at what the original actually looks like.
__________________
They gave me his photo, threw me in a pizza oven, called it a "pod", and told me to wing it
Well, I said "the original file is a perfect sine wave when played back". But nonetheless you will get audible distortions using a linear interpolation. Why would you want these distortions, I ask again?
And I said "Ofcourse, when the original file is played back it will look like a sine wave, because your DAC has a filter. The purpose of this thread is to avoid that sound." The original file won't look anything like a sine wave when played back through a NOS DAC, for example.
The "distortions" you're referring to can only be called distortion if one assumes that the samples originally represented a sine wave.
__________________
They gave me his photo, threw me in a pizza oven, called it a "pod", and told me to wing it
The "distortions" you're referring to can only be called distortion if one assumes that the samples originally represented a sine wave.
And that's the case here.
There are two extreme cases:
1. You have pure square waves. Then linear interpolation is better because it preserves the sharpness of the edges.
2. You have pure sine waves. Then linear interpolation is worse because it doesn't properly reconstruct the sine wave.
In the first case the problem is that the 100% sharp edges are replaced by sine waves that only approximate the former shape.
In the second case the problem is that the inserted samples don't represent what would be there if the sample had been in the higher sample rate from the beginning.
Now the question is what is more audible. The first problem or the second problem. I would say the second problem is. You obviously would say the opposite.
Is that an accurate definition of what the whole discussion is about?
Anyway, please give a shout when the plugin's ready... It'd be rather fancy.
Just make sure it uses 32-bit internal transforms during upsampling and no sound gets hurt :-)
By the way, a square-based instrument part was long a test track on a gear-testing CD. In some other places it might attract customers reacting to larger speakers shaking store.
Seidhepriest, looks like I won't have to code it. Check this out:
Top one is 5Khz, bottom is 8Khz. Not sure where those large notches are coming from, but it works fine on other frequencies I've tried.
The other weird thing is my DAC all of a sudden developed a ringing at 96Khz today (you can see it on the top graph). I can't get a DC signal out of it, whereas yesterday I could. Weird.
But yeah, apart from those two issues I'm happy with this upsampler. It retains decent square edges below 10Khz and keeps very smooth sine waves above that. The best of both worlds CPU usage is 50% though >_<
LawnGnome: Grow up.
__________________
They gave me his photo, threw me in a pizza oven, called it a "pod", and told me to wing it
SRC in Foobar should sound about the same though. My DAC must've had a brainfart or something, coz square waves are sharper today than they were yesterday, and that 96Khz component wasn't there yesterday or the day before either.
Thanks guys, problem solved
__________________
They gave me his photo, threw me in a pizza oven, called it a "pod", and told me to wing it
Top one is 5Khz, bottom is 8Khz. Not sure where those large notches are coming from, but it works fine on other frequencies I've tried.
The other weird thing is my DAC all of a sudden developed a ringing at 96Khz today (you can see it on the top graph). I can't get a DC signal out of it, whereas yesterday I could. Weird.
But yeah, apart from those two issues I'm happy with this upsampler. It retains decent square edges below 10Khz and keeps very smooth sine waves above that. The best of both worlds CPU usage is 50% though >_<
LawnGnome: Grow up.
Why are you so focused on finding an upsampler that produces nice square waves? when it distorts everything else?
You are spending time to reduce the quality of the output, so you must have some misconception that this will help you in some way. Either that or you just want more distorted sound.
__________________
X-fi XtremeMusic > Citypulse 7.2x II DAC > PPAV2 maxxed > Grado SR60 & Grado SR325i & Beyerdynamic DT770 & Beyerdynamic DT990('05) & AKG K701 & Denon AH-D2000 FEEDBACK
CPU usage is 50% though >_<
Linear Mode
