It's not aliased even at 80 kHz, but the noise is always there. (Actually I played 192/16, but I don't think it's important.)
I asked what I didn't know. Please read what I wrote! I don't know everything about it, but the source. And when I started the thread I was not sure about it, and I didn't know if it's a common problem, or an individual, but since then I could check other sound cards, so now I know it's a common problem (and I shared this info with others). I also don't know if there's a hidden possibility to switch the DAC to fast roll-off filter mode. Do you think if somebody asks, then he must be (and stay) completely ignorant?
Last edited:
Thank you for the picture and info! How did you determine the sampling rate? Only by the source, or can you adjust the soundcard directly somehow?
Well, whatever I can tell, you think the problem is with the DAC. I don't think so. I've used the Audigy 2ZS notebook, and the only problem I get from that is clock jitter. However, it does not create a noise problem in measurements. Some of the SB cards let you set the sample rates, but not all. Anyway, if you have to be so defensive in your replies, I will just step aside. Good luck.
BTW, if you want more control, possibly there is a Kx project driver available. Try to look it up.
Last edited:
The sound card has an application for setting the sample rate.
The noise is halved in 192kHz mode. (I could see the generated 90kHz sine wave on scope, so the 192k sampling rate is correct)
Hi,
Pafi, I did not really understand it, just that you have 60 and 300kHz noise. (If this measure is directly oscilloscope card's output), then it is normal to see beyond the audio band signals and these depend on the samples / rate / bit.
It is not clear how to use the Audigy 2 drivers and no software for it.
PC sees it as the default audio? . you can download the software and drivers are very important to use good card. (You can see that the noise and peak frequency change depending on the settings).
Pafi, I did not really understand it, just that you have 60 and 300kHz noise. (If this measure is directly oscilloscope card's output), then it is normal to see beyond the audio band signals and these depend on the samples / rate / bit.
It is not clear how to use the Audigy 2 drivers and no software for it.
PC sees it as the default audio? . you can download the software and drivers are very important to use good card. (You can see that the noise and peak frequency change depending on the settings).
AP2!
No, I don't have 2 noises at 60 and 300 kHz, but I have a noise spectra between 60 and 300 kHz! It's not periodic, it looks like a band-limited pink noise. (As you can see on fehrudi's picture.)
Sorry, but I don't understand this sentence!
Maybe it depends, but I can't adjust it.
I don't understand why do you say it's normal. I have never seen such noise on older cards. Of course always there is some noise, maybe a whole mV, but not 80 mV!
Simply: I got a CD with a file SBAX_PCDRV_LB_2_18_0011.exe and I installed it.
Please tell me wich is that specific software, and where can I get it from, and maybe I will install it. (If I don't have to follow a 5 pages long guide to do it.)
No, I don't have 2 noises at 60 and 300 kHz, but I have a noise spectra between 60 and 300 kHz! It's not periodic, it looks like a band-limited pink noise. (As you can see on fehrudi's picture.)
Sorry, but I don't understand this sentence!
Maybe it depends, but I can't adjust it.
I don't understand why do you say it's normal. I have never seen such noise on older cards. Of course always there is some noise, maybe a whole mV, but not 80 mV!
Simply: I got a CD with a file SBAX_PCDRV_LB_2_18_0011.exe and I installed it.
Please tell me wich is that specific software, and where can I get it from, and maybe I will install it. (If I don't have to follow a 5 pages long guide to do it.)
Last edited:
If you have an Audigy 2 then please could you answer to my question? Is there a noise at high freq on analog output or not? Have you ever checked it with a high bandwidth device (for example oscilloscope)?
now I understand (you could write 60 to 300KHz) instead 60 and 300KHz.
no problem, I can guarantee that audigy 2 has-108dB SN / R flat up to 46KHz (samples = 96kHz/24bit). no noise, then you module Have a problem or mistake on setting parameters.
audigy on the web, download and install driver + Configure Panel (exe), simple, without guides or see page long.
This panel have set for f-sample(44 to 192KHz) and bit (16/24).
no problem, I can guarantee that audigy 2 has-108dB SN / R flat up to 46KHz (samples = 96kHz/24bit). no noise, then you module Have a problem or mistake on setting parameters.
audigy on the web, download and install driver + Configure Panel (exe), simple, without guides or see page long.
This panel have set for f-sample(44 to 192KHz) and bit (16/24).
Last edited:
Does your class D amp have floating ground for speaker outputs? I think you cannot measure if that is the case.
That is ,perfectly the normal behavior for low bit modulator, high order noise shaping chips like those cheap cirrus DA's.
Also its fast roll off filter isn't really that steep , because these chips are optimised for low latency, and can't use many FIR taps like for example ESS sabre does.
You can count somewhat on the switched capacitor output stage. Looks like , not that much.
...BTW , ever saw how sacd output spectra looks ?
Also its fast roll off filter isn't really that steep , because these chips are optimised for low latency, and can't use many FIR taps like for example ESS sabre does.
You can count somewhat on the switched capacitor output stage. Looks like , not that much.
...BTW , ever saw how sacd output spectra looks ?
Last edited:
let me show you:
An externally hosted image should be here but it was not working when we last tested it.
I don't know what do you call floating ground, I think this is an oximoron, but there is not any amplifier connected yet, only the sound card is measured. Thanks for your attention!
So I don't have to type it again, here's my rant:
AudioKarma.org Home Audio Stereo Discussion Forums - View Single Post - Is the $50 Creative X-Fi worth it for my PC to Amplfier connection?
E-mu Systems - Wikipedia, the free encyclopedia
it could be the common "core DSP" in these cards that's the culprit.
AudioKarma.org Home Audio Stereo Discussion Forums - View Single Post - Is the $50 Creative X-Fi worth it for my PC to Amplfier connection?
Looking at this article on E-Mu Systems (owned by Creative Technology, maker of Audigy) under the "Non-Creative sound cards" section:
E-mu Systems - Wikipedia, the free encyclopedia
it could be the common "core DSP" in these cards that's the culprit.
Why would the DSP make noise?!?
(No, don't answer unless you really know what you are talking about, and you really understand what is the issue!)
Stop guessing! What I search for, is information, not ideas! I've wasted plenty of time already!
(No, don't answer unless you really know what you are talking about, and you really understand what is the issue!)
Stop guessing! What I search for, is information, not ideas! I've wasted plenty of time already!
Pafi - please be polite to those who are trying to help.
- Status
- Not open for further replies.