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#1
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QUESTION: I Need Help With S/PDIF Issue!!
I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is
a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. The MOTU 828 has only two XLR inputs, and since I will occasionally like to use the Soundcraft as a submix for recording drum kits, I thought I would take advantage of the situation by buying a Monster Cable S/PDIF cable and connecting the Soundcraft S/PDIF output to the MOTU 828's input. I tested the connection by patching the stereo ANALOG outputs of my old Korg D16 into the PB (playback) inputs on the Soundcraft mixer and then recording the Korg's playback into the AudioDesk software. I recorded onto a single STEREO track in AudioDesk. It worked fine...BUT...when I listened back to the recording I made in AudioDesk, I noticed that in the right channel only there is this half-second burst of white noise that occurs approximately every 5 seconds!!! The left channel audio is perfect. (Actually, the right channel audio sound great, too, except for the white noise bursts.) What could be the problem? It can't be some weird clock issue, since I used the analog outputs of the Korg. Why would I have perfect audio on the left channel but these weird blasts of white noise in the right channel? Any help with this will be MUCH appreciated! |
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#2
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Is the sample rate on the 828 spdif input set to match the Soundcraft ?
Why use the digital in?... unless you think your Soundcraft has a better sounding A/D than the MOTU.... Use the digital in for digital sources like DAT.. Rgds: Eric "HWBossHoss" wrote in message ... I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. The MOTU 828 has only two XLR inputs, and since I will occasionally like to use the Soundcraft as a submix for recording drum kits, I thought I would take advantage of the situation by buying a Monster Cable S/PDIF cable and connecting the Soundcraft S/PDIF output to the MOTU 828's input. I tested the connection by patching the stereo ANALOG outputs of my old Korg D16 into the PB (playback) inputs on the Soundcraft mixer and then recording the Korg's playback into the AudioDesk software. I recorded onto a single STEREO track in AudioDesk. It worked fine...BUT...when I listened back to the recording I made in AudioDesk, I noticed that in the right channel only there is this half-second burst of white noise that occurs approximately every 5 seconds!!! The left channel audio is perfect. (Actually, the right channel audio sound great, too, except for the white noise bursts.) What could be the problem? It can't be some weird clock issue, since I used the analog outputs of the Korg. Why would I have perfect audio on the left channel but these weird blasts of white noise in the right channel? Any help with this will be MUCH appreciated! |
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#3
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Is the sample rate on the 828 spdif input set to match the Soundcraft ?
Why use the digital in?... unless you think your Soundcraft has a better sounding A/D than the MOTU.... Use the digital in for digital sources like DAT.. Rgds: Eric "HWBossHoss" wrote in message ... I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. The MOTU 828 has only two XLR inputs, and since I will occasionally like to use the Soundcraft as a submix for recording drum kits, I thought I would take advantage of the situation by buying a Monster Cable S/PDIF cable and connecting the Soundcraft S/PDIF output to the MOTU 828's input. I tested the connection by patching the stereo ANALOG outputs of my old Korg D16 into the PB (playback) inputs on the Soundcraft mixer and then recording the Korg's playback into the AudioDesk software. I recorded onto a single STEREO track in AudioDesk. It worked fine...BUT...when I listened back to the recording I made in AudioDesk, I noticed that in the right channel only there is this half-second burst of white noise that occurs approximately every 5 seconds!!! The left channel audio is perfect. (Actually, the right channel audio sound great, too, except for the white noise bursts.) What could be the problem? It can't be some weird clock issue, since I used the analog outputs of the Korg. Why would I have perfect audio on the left channel but these weird blasts of white noise in the right channel? Any help with this will be MUCH appreciated! |
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#4
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Is the sample rate on the 828 spdif input set to match the Soundcraft ?
It's funny you should ask this. I attempted to make the MOTU 828 sample at a rate higher than 44.1kHz, but the AudioDesk software correctly identified the incoming ANALOG audio as only being 44.1kHz quality and would only work at that rate. How it determined this, I have no idea. |
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#5
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Is the sample rate on the 828 spdif input set to match the Soundcraft ?
It's funny you should ask this. I attempted to make the MOTU 828 sample at a rate higher than 44.1kHz, but the AudioDesk software correctly identified the incoming ANALOG audio as only being 44.1kHz quality and would only work at that rate. How it determined this, I have no idea. |
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#6
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In article ,
HWBossHoss wrote: Is the sample rate on the 828 spdif input set to match the Soundcraft ? It's funny you should ask this. I attempted to make the MOTU 828 sample at a rate higher than 44.1kHz, but the AudioDesk software correctly identified the incoming ANALOG audio as only being 44.1kHz quality and would only work at that rate. How it determined this, I have no idea. Analog audio doesn't HAVE any sample rate. Quality and sample rate have nothing to do with one another. You have a clock issue somewhere. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#7
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In article ,
HWBossHoss wrote: Is the sample rate on the 828 spdif input set to match the Soundcraft ? It's funny you should ask this. I attempted to make the MOTU 828 sample at a rate higher than 44.1kHz, but the AudioDesk software correctly identified the incoming ANALOG audio as only being 44.1kHz quality and would only work at that rate. How it determined this, I have no idea. Analog audio doesn't HAVE any sample rate. Quality and sample rate have nothing to do with one another. You have a clock issue somewhere. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#8
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HWBossHoss wrote:
I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. The MOTU 828 has only two XLR inputs, and since I will occasionally like to use the Soundcraft as a submix for recording drum kits, I thought I would take advantage of the situation by buying a Monster Cable S/PDIF cable and connecting the Soundcraft S/PDIF output to the MOTU 828's input. I tested the connection by patching the stereo ANALOG outputs of my old Korg D16 into the PB (playback) inputs on the Soundcraft mixer and then recording the Korg's playback into the AudioDesk software. I recorded onto a single STEREO track in AudioDesk. It worked fine...BUT...when I listened back to the recording I made in AudioDesk, I noticed that in the right channel only there is this half-second burst of white noise that occurs approximately every 5 seconds!!! The left channel audio is perfect. (Actually, the right channel audio sound great, too, except for the white noise bursts.) What could be the problem? It can't be some weird clock issue, since I used the analog outputs of the Korg. Why would I have perfect audio on the left channel but these weird blasts of white noise in the right channel? Any help with this will be MUCH appreciated! From your description of the problem I see several options. An analogue problem in your Souncraft mixing console. Maybe even bad switch contact of the 'PB replace mix' switch. Try recording via SPDIF onto DAT. If the problem persits you can exclude te MOTU as cause of the problem. A defective AtoD or defective SPDIF circuit in your Soundcraft. You might try and record from another digital source into the MOTU. And last but not least a clock problem between the SPDIF input and output. MOTU should sync to input. Try a different cable. It is clear that the MOTU at least is reading some of the signal it receives on the SPDIF input. The correct sample rate is part of the things that are coded in the channel status bits that are sent along with the audio samples in the data stream of the SPDIF. That is how your MOTU interface is recognising the correct sample rate. my regards, Bert Kraaijpoel |
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#9
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HWBossHoss wrote:
I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. The MOTU 828 has only two XLR inputs, and since I will occasionally like to use the Soundcraft as a submix for recording drum kits, I thought I would take advantage of the situation by buying a Monster Cable S/PDIF cable and connecting the Soundcraft S/PDIF output to the MOTU 828's input. I tested the connection by patching the stereo ANALOG outputs of my old Korg D16 into the PB (playback) inputs on the Soundcraft mixer and then recording the Korg's playback into the AudioDesk software. I recorded onto a single STEREO track in AudioDesk. It worked fine...BUT...when I listened back to the recording I made in AudioDesk, I noticed that in the right channel only there is this half-second burst of white noise that occurs approximately every 5 seconds!!! The left channel audio is perfect. (Actually, the right channel audio sound great, too, except for the white noise bursts.) What could be the problem? It can't be some weird clock issue, since I used the analog outputs of the Korg. Why would I have perfect audio on the left channel but these weird blasts of white noise in the right channel? Any help with this will be MUCH appreciated! From your description of the problem I see several options. An analogue problem in your Souncraft mixing console. Maybe even bad switch contact of the 'PB replace mix' switch. Try recording via SPDIF onto DAT. If the problem persits you can exclude te MOTU as cause of the problem. A defective AtoD or defective SPDIF circuit in your Soundcraft. You might try and record from another digital source into the MOTU. And last but not least a clock problem between the SPDIF input and output. MOTU should sync to input. Try a different cable. It is clear that the MOTU at least is reading some of the signal it receives on the SPDIF input. The correct sample rate is part of the things that are coded in the channel status bits that are sent along with the audio samples in the data stream of the SPDIF. That is how your MOTU interface is recognising the correct sample rate. my regards, Bert Kraaijpoel |
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#11
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In article ,
(HWBossHoss) wrote: I am using MOTU AudioDesk software (until I upgrade to DP) and my interface is a MOTU 828mkII, which has an S/PDIF input and output. I have a Soundcraft Spirit M8 mixer left over from my old recording rig which has an S/PDIF output which is a stereo Mix Output. [snip] What could be the problem? It can't be some weird clock issue, ....it most certainly is! since I used the analog outputs of the Korg. ....but you digitally connected a digital console to your DAW and neglected to clock your DAW to the console. You need to tell AudioDesk to slave it's clock to the S/PDIF input of the 828. Regards, Monte McGuire |
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#12
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Analog audio doesn't HAVE any sample rate. Quality and sample rate have
nothing to do with one another. I realize this. I also realize that I could have phrased my description much better than I did. I was trying to say that, since I was using the *analog* outputs of the Korg D16, that it couldn't be a clock issue between the MOTU and the Korg. I realize that I was incorrect in saying (or even implying) that the sample rate could have anything to do with the analog output. That is not what I meant to say. I already know that analog audio has nothing to do with sample rate. I was trying to say that the original audio that was recorded INTO the Korg D16 was, in fact, recorded with a 44.1kHz sample rate. I don't know why I paired my comments about the analog audio with my comments about the sample rate...call it a brain stammer on my part. Sorry for the confusion. |
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#13
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Analog audio doesn't HAVE any sample rate. Quality and sample rate have
nothing to do with one another. I realize this. I also realize that I could have phrased my description much better than I did. I was trying to say that, since I was using the *analog* outputs of the Korg D16, that it couldn't be a clock issue between the MOTU and the Korg. I realize that I was incorrect in saying (or even implying) that the sample rate could have anything to do with the analog output. That is not what I meant to say. I already know that analog audio has nothing to do with sample rate. I was trying to say that the original audio that was recorded INTO the Korg D16 was, in fact, recorded with a 44.1kHz sample rate. I don't know why I paired my comments about the analog audio with my comments about the sample rate...call it a brain stammer on my part. Sorry for the confusion. |
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#14
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You need to look at the clock settings, set it to synch off the spdif input
If you are running OSX look on pg 19 of the manual Choose Configure Audio System Choose Configure Hardware Driver Where the screen shows adat optical under clock modes click the box and change it to spdif.... For OS9 try pg 40 choose MOTU Audio System Options under Basics Select Configure Hardware Driver in the clock source box select spdif Make sure you switch it back sync from the 828's clock when the Soundcraft is disconnected or you will have similar strange results... the Soundcraft has 44.1 output, The M8 looks like a nice machine however their website makes it evident that the spdif output and associated a/d are not anything special.... they give no info on it other than 44.1 sample rate. As a result using the MOTU for A/D should be a better choice..... a pair of xlr - trs cables would solve your problem. I use Magix Sequoia on a Win 2k pc..... with the 896HD Rgds: Eric www.webermusic.com As for the Clock original problem "HWBossHoss" wrote in message ... Analog audio doesn't HAVE any sample rate. Quality and sample rate have nothing to do with one another. I realize this. I also realize that I could have phrased my description much better than I did. I was trying to say that, since I was using the *analog* outputs of the Korg D16, that it couldn't be a clock issue between the MOTU and the Korg. I realize that I was incorrect in saying (or even implying) that the sample rate could have anything to do with the analog output. That is not what I meant to say. I already know that analog audio has nothing to do with sample rate. I was trying to say that the original audio that was recorded INTO the Korg D16 was, in fact, recorded with a 44.1kHz sample rate. I don't know why I paired my comments about the analog audio with my comments about the sample rate...call it a brain stammer on my part. Sorry for the confusion. |
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#15
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You need to look at the clock settings, set it to synch off the spdif input
If you are running OSX look on pg 19 of the manual Choose Configure Audio System Choose Configure Hardware Driver Where the screen shows adat optical under clock modes click the box and change it to spdif.... For OS9 try pg 40 choose MOTU Audio System Options under Basics Select Configure Hardware Driver in the clock source box select spdif Make sure you switch it back sync from the 828's clock when the Soundcraft is disconnected or you will have similar strange results... the Soundcraft has 44.1 output, The M8 looks like a nice machine however their website makes it evident that the spdif output and associated a/d are not anything special.... they give no info on it other than 44.1 sample rate. As a result using the MOTU for A/D should be a better choice..... a pair of xlr - trs cables would solve your problem. I use Magix Sequoia on a Win 2k pc..... with the 896HD Rgds: Eric www.webermusic.com As for the Clock original problem "HWBossHoss" wrote in message ... Analog audio doesn't HAVE any sample rate. Quality and sample rate have nothing to do with one another. I realize this. I also realize that I could have phrased my description much better than I did. I was trying to say that, since I was using the *analog* outputs of the Korg D16, that it couldn't be a clock issue between the MOTU and the Korg. I realize that I was incorrect in saying (or even implying) that the sample rate could have anything to do with the analog output. That is not what I meant to say. I already know that analog audio has nothing to do with sample rate. I was trying to say that the original audio that was recorded INTO the Korg D16 was, in fact, recorded with a 44.1kHz sample rate. I don't know why I paired my comments about the analog audio with my comments about the sample rate...call it a brain stammer on my part. Sorry for the confusion. |
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#16
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#17
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