From mboxrd@z Thu Jan 1 00:00:00 1970 From: "marion rundell" Subject: Re: Need help with Audio out from an Embedded system...Linux 2.4. Date: Wed, 24 Jan 2007 07:20:18 -0600 Message-ID: <00b401c73fba$65801bf0$1402a8c0@pcc41100> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2041067163==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org This is a multi-part message in MIME format. --===============2041067163== Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B1_01C73F88.19AC68A0" This is a multi-part message in MIME format. ------=_NextPart_000_00B1_01C73F88.19AC68A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I am new to this forum and new to Linux, so please forgive mistakes I = might make in the following explanation of what I am trying to obtain. My goal is to have COAX SPDIF out of an embedded unit, or a USB digital = signal that will output to an M-Audio Audiophile USB (or other = intermediate device) which can then send COAX SPDIF to an audio = receiver. I am using an Aaeon AEC6820, embedded system, with USB 1.1 out (or the = option of a pcmcia card (not bus)). The Chipset in this device is the = VT82C686B I am trying to get COAX SPDIF out from this system either by using an = external USB device (Audiophile USB by M-audio or other device) or by = internal SPDIF out. I am using Linux 2.4, and I have read that Linux 2.4 was certainly = supporting SPDIF for some devices. The question I have is will Linux = 2.4 support COAX SPDIF for the M-Audio. If not, what device could I = use to get COAX SPDIF out? So far, from the M-audio we cannot get = clean sound out...it pops and sputters and sometimes doesn't put sound = out at all.=20 Using the M-audio device connected to a USB 1.1 port, we are able to = hear clean analog sound, although not as good as we would expect from = SPDIF from the external device...like the M-Audio Audiophile USB. = Digital optical can be delivered by the AEC6820 from a USB 1.1 = port...but has a lot of jitter. I would like to know if I can get the embedded device with the = VT82C686B to output by USB 1.1 or pcmcia card (not bus) to the M-Audio = Audiophile USB device to get clean SPDIF out of the M-Audio device to = an audio receiver. I want COAX SPDIF out of an embedded Linux system (either directly or = through an output that can be converted by an external M-Audio = Audiophile USB or other device). I do not manage the embedded system, I = am not an admin but I can access the system to change the driver = information or add a patch as necessary. This embedded system is based = on a Linux 2.4.x.x operating system. This is what I know: 1. Direct optical out of the embedded system (AEC6820) works but the = sound is full of jitter. 2. USB 1.1 out of the embedded system (AEC6820) will send a signal to = the M-audio Audiophile USB...but the sound is not stable (although = sometimes it works). If this chipset based on a Linux 2.4 platform will not output a COAX = SPDIF...by way of a pcmcia card or USB 1.1, or output a signal that can = be converted by the M-audio Audiophile USB to COAX SPDIF, I am thinking = of trying to upgrade the embedded system from the AEC6820 to an AEC6830 = on the same Linux 2.4 platform. The upgraded box does have a direct = SPDIF jack out. =20 The chipset in the upgraded box is the following: The AEC-6830 is inside CPU board(GENE-6350) which uses the ALC650 = chipset for audio and SPDIF function.=20 The manufacturer of both boxes does not support Linux, so they don't = know if I can get SPDIF to work from the AEC6820 using the VT82C686B. = And they don't know if I can get Linux 2.4 to work on the AEC-6830. =20 In summary I would like to know the following: 1. Is there a way to get the older VT82C686B chipset to work better? 2. If I upgrade to the new AEC6830 (chipset ALC650), would it be = supported on a Linux 2.4 platform (or will I have to try to recompile to = a newer version of Linux)? 3. Is there any way to get stable sound out of the Audiophile USB (or = some other intermediate device that would output COAX SPDIF) while not = recompiling the kernel?=20 Thank you in advance for any assistance. Marion mrundell@gmail.com ------=_NextPart_000_00B1_01C73F88.19AC68A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi,
 
I am new to this forum and new to = Linux, so please=20 forgive mistakes I might make in the following explanation of what I am = trying=20 to obtain.
 
My goal is to have COAX SPDIF out of an = embedded=20 unit, or a USB digital signal that will output to an M-Audio Audiophile = USB (or=20 other intermediate device) which can then send COAX SPDIF to an audio=20 receiver.
I am using an Aaeon AEC6820, embedded = system, with=20 USB 1.1 out (or the option of a pcmcia card (not bus)).  The = Chipset in=20 this device is the VT82C686B
 
I am trying to get COAX SPDIF out from = this system=20 either by using an external USB device (Audiophile USB by M-audio or = other=20 device) or by internal SPDIF out.
 
I am using Linux 2.4, and I have read = that Linux=20 2.4 was certainly supporting SPDIF for some devices.  The question = I have=20 is will Linux 2.4 support COAX SPDIF  for the M-Audio.  If = not, what=20 device could I use to get  COAX SPDIF out?  So far, from the = M-audio=20 we cannot get clean sound out...it pops and sputters and sometimes = doesn't put=20 sound out at all. 
 
Using the M-audio device connected to a = USB 1.1=20 port, we are able to hear clean analog sound, although not as good as we = would=20 expect from SPDIF from the external device...like the M-Audio Audiophile = USB.  Digital optical can be delivered by the AEC6820 from a USB = 1.1=20 port...but has a lot of jitter.
 
I would like to know if I can get=20 the embedded device with the  VT82C686B to output by USB = 1.1 or=20 pcmcia card (not bus) to the M-Audio Audiophile USB = device  to=20 get clean SPDIF out of the M-Audio device to an audio = receiver.
 
I want COAX=20 SPDIF out of an embedded Linux system (either directly or through = an output=20 that can be converted by an external M-Audio Audiophile USB or = other=20 device).  I do not manage the embedded system, I am not an admin = but I can=20 access the system to change the driver information or add a patch as = necessary.=20 This embedded system is based on a Linux 2.4.x.x operating=20 system.
 
This = is what I=20 know:
 
1. =20 Direct optical out of the = embedded system=20 (AEC6820) works but the sound is full of = jitter.
 
2.  USB 1.1 out=20 of the embedded system (AEC6820) will send a signal to the M-audio=20 Audiophile USB...but the sound is not stable (although sometimes it=20 works).
 
If = this chipset=20 based on a Linux 2.4 platform will not output a COAX SPDIF...by way of a = pcmcia=20 card or USB 1.1, or output a signal that can be converted by the M-audio = Audiophile USB to COAX SPDIF, I am thinking of trying to upgrade the = embedded=20 system from the AEC6820 to an AEC6830 on the same Linux 2.4 = platform.  The=20 upgraded box does have a direct SPDIF jack out.  =
The = chipset in the=20 upgraded box is the following:
 
The AEC-6830 is inside CPU = board(GENE-6350) which=20 uses the ALC650 chipset for audio and SPDIF function. =

 
The = manufacturer of=20 both boxes does not support Linux, so they don't know if I can get SPDIF = to work=20 from the AEC6820 using the VT82C686B.  And they don't know if I can = get  Linux 2.4 to work on the AEC-6830. 
 
In = summary I would=20 like to know the following:
 
1.  Is there a=20 way to get the older VT82C686B chipset to work = better?
 
2.  If I=20 upgrade to the new AEC6830 (chipset ALC650), would it be supported on a = Linux=20 2.4 platform (or will I have to try to recompile to a newer version of=20 Linux)?
 
3.  Is there=20 any way to get stable sound out of the Audiophile USB (or some=20 other intermediate device that would output COAX SPDIF) while = not=20 recompiling the kernel? 
 
Thank = you in advance=20 for any assistance.
 
Marion
mrundell@gmail.com
 
 
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