Junk PC card issues...

darkfenriz · 12th March 2006, 02:54 PM

Hi all
I have feed my amplifier directly from integrated 5HI+ low quality sound card I have now (thinking of "M-Audio audiophile" of "Audiotrak-Maya" in future when I have some spare monay).
The results are quite frightening.

Here are my observations and impressions:

1. There is some low frequency noise (not mains hum) and it gets more intensive when different devices do things. Seems to me that it happens when HDD, DVD-ROM or mouse or something else generate interruptions to prosessor. Is it related to supply? Or faulty ground sheme? Or maybe high clock jitter caused by supply changes?

2. High frequencies intermodulate with their mirror images over 22050Hz causing audible products. It is not directly hearable as intermodulation effect when listernig to classical/jazz/rock, but it gets pretty obvious with some ambient/darkwave music with much content above, say 17kHz, some pure tones and synthetic noises clearly reveal this. I heard this when playing Norwegian band "Ulver" , "Perdition City" album. By the way beautiful music, isn't it?

I guess it heavily degrades every music not band-limited, not as a pure effect, but general degradation and false reproduction.

Is this a question with more sophisticated sound cards with better interpolation and filtering? Is this an issue with digital sources in general? Oversampled or non-oversampled does make any difference as far as this effect is concerned?

Comments most welcome
best regards

Adam

Leolabs · 13th March 2006, 12:59 AM

1)This due to mainly grounding problem as I'm using a CD-ROM as my CD player which is inducing some noise on my amp.

2)Seem it is a cheap sound card,the design itself is the problem.

darkfenriz · 14th March 2006, 10:31 PM

Don't you think junk equipmnt. gives lights to some points about better one?

DoomPixie · 14th March 2006, 10:38 PM

i had similar problems sometimes.. if i used the wheel on the mouse i got an annoying clicking sound through my soundcard.. and i use an m-audio delta 1010.. I reorganised the cables at the back of the PC and no more problems, Mouse and keyboard are both plugged into front USB sockets now aswell to keep the cables away from the audio cables at the back..
Owen

12th March 2006, 02:54 PM	#1
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Junk PC card issues... Hi all I have feed my amplifier directly from integrated 5HI+ low quality sound card I have now (thinking of "M-Audio audiophile" of "Audiotrak-Maya" in future when I have some spare monay). The results are quite frightening. Here are my observations and impressions: 1. There is some low frequency noise (not mains hum) and it gets more intensive when different devices do things. Seems to me that it happens when HDD, DVD-ROM or mouse or something else generate interruptions to prosessor. Is it related to supply? Or faulty ground sheme? Or maybe high clock jitter caused by supply changes? 2. High frequencies intermodulate with their mirror images over 22050Hz causing audible products. It is not directly hearable as intermodulation effect when listernig to classical/jazz/rock, but it gets pretty obvious with some ambient/darkwave music with much content above, say 17kHz, some pure tones and synthetic noises clearly reveal this. I heard this when playing Norwegian band "Ulver" , "Perdition City" album. By the way beautiful music, isn't it? I guess it heavily degrades every music not band-limited, not as a pure effect, but general degradation and false reproduction. Is this a question with more sophisticated sound cards with better interpolation and filtering? Is this an issue with digital sources in general? Oversampled or non-oversampled does make any difference as far as this effect is concerned? Comments most welcome best regards Adam

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
My DIY UcD amp from the junk box	acid_k2	Class D	34	5th April 2012 08:03 AM
I found more junk!	Magnetmaz	Tubes / Valves	9	28th December 2007 08:49 AM
FS: AMD 1 GHz CPU, motherboard, 256MB RAM, video card, power supply, network card	Jimmy154	Swap Meet	0	14th June 2006 08:15 PM
Tip for Junk box Zen PSU?	SM7UYJ	Pass Labs	2	4th April 2005 09:57 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

13th March 2006, 12:59 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	1)This due to mainly grounding problem as I'm using a CD-ROM as my CD player which is inducing some noise on my amp. 2)Seem it is a cheap sound card,the design itself is the problem.

14th March 2006, 10:31 PM	#3
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Don't you think junk equipmnt. gives lights to some points about better one?

14th March 2006, 10:38 PM	#4
DoomPixie diyAudio Member Join Date: Jun 2005 Location: Aberystwyth / Llanelli (wales)	i had similar problems sometimes.. if i used the wheel on the mouse i got an annoying clicking sound through my soundcard.. and i use an m-audio delta 1010.. I reorganised the cables at the back of the PC and no more problems, Mouse and keyboard are both plugged into front USB sockets now aswell to keep the cables away from the audio cables at the back.. Owen

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)