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[hfsig] Performance of 24/192 soundcards? USB Soundcards

(SV2AGW)George Rossopoulos sv2agw at raag.org
Mon Sep 20 16:31:01 UTC 2004


Hi Bob

He have such a conversation a couple of days before in AGWPE mailing list.
We try to find if a card can work on 9600b, (On 9600b I am using the
standard 44.100khz sampling rate), and imagine there are Soundcards that
cannot work even on 44.100khz right.
I have such a card that becomes mono if it is used on 44.100Khz. On 22050Khz
is stereo.

The biggest problem is not what works or not but how to test something that
before purchase it.
There is no way to test a Soundcard before buy.
You have to found someone else who has the card and ask him.

In most cases products that are Microsoft certified (WIN Logo and certified
drivers) do what they say. But since the Win Logo specifications do not
cover 192Khz it is difficult to decide with just a look at the box.

I am sure that professional Soundcards work well.

73

(SV2AGW)George Rossopoulos
sv2agw at elcom.gr
www.elcom.gr/sv2agw
+306932465216
George Rossopoulos
Nikanoros 59
54250,Thessaloniki
Greece
 
-----Original Message-----
From: hfsig-bounces at lists.tapr.org [mailto:hfsig-bounces at lists.tapr.org] On
Behalf Of Robert McGwier
Sent: Monday, September 20, 2004 4:19 PM
To: TAPR HF Modes SIG Mailing List
Subject: RE: [hfsig] Performance of 24/192 soundcards? USB Soundcards


The M-Audio Delta 44 (and others in that series) are good to
96 Khz (or thereabouts) when you up the sample rate to 192 Khz.

The Lynx L22 is the same.

Delta 44 $140

Lynx L22  $900  !!!!


Let me be more emphatic than I was at DCC.  I have not found a single USB
sound card that works at ALL in full duplex mode (necessary for SDR-1000)
under Linux.

I have recently discovered much more to my dismay.  ALSA is not ready for
prime time.  It is a complete and total JOKE compared to 4Front OSS or
Windows sound system support.  In my not so humble opinion,  the open
source/GPL community should be forced to give up their paying jobs every
time they make a forward looking statement that is not supported by
experience.  I have YET to get an ALSA supported card to record on my Linux
box.  I am still desperately beating on this to get a free open source
solution for this.  In the interim, in support of this project, I have
purchased 4Front OSS support for my Lynx L22 and Delta 44.

Jack is a neat thing and will probably be usable in a about a year. ;-(.

I am completely disgusted with Linux multimedia open source support.  It is
appalling.

Bob



-----Original Message-----
From: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]On Behalf Of Tom McDermott
Sent: Friday, September 17, 2004 10:24 PM
To: hfsig at lists.tapr.org
Subject: [hfsig] Performance of 24/192 soundcards?


There was some discussion at the ARRL/TAPR DCC of 24-bit, 192 ks/s
soundcards. Doing a google search on the subject leads to a few cards that
actually have 192 ks/s for both the ADC and DAC (and allow sampling at
192k). Unfortunately none of the sites list the frequency response of these
cards at the maximum sample rate (or any rate, for that matter).

Does anyone on the list have information about the frequency response of
these higher-performance cards? On the one hand, it could be just the same
as current sound cards (about 20 KHz.) On the other, they could have
something approaching 80KHz. Can't seem to find which by looking over the
various PCI and USB cards.

	-- Tom, N5EG



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