Dropouts/gliches in recording

SamHardy wrote on 11/5/2000, 10:26 PM

I wanted to add info about my system if it helps:

PIII 700 mhz processor
Ultra-160 SCSI disk for audio + virtual memory, 5400RPM DMA drive for
apps
256 mb ram
Windows 98 R2
Vegas Video 2.0a
Aark Direct Pro sound card for record/playback.

I'm dreading that my problem is that i'm not using 98SE? I really
hate rebuilding my system, takes hours.

The problem restated:
Recorded tracks are being written to the disk with occaisional 14- to
56-sample dropouts, causing pops in the track and generally being a
bad thing.

This did not happen to me with Sound Forge or with Vegas 1.x; also,
it happens no matter how many or few tracks are in the project: a
brand-new project with no tracks will still record gaps into the
first track recorded into the project.

Any help is tremendously appreciated. Thanks!

Sam Hardy

Sam Hardy wrote:
>>I am experiencing troublesome dropout glitches recording in
>>vegas video; basically, any given track will have pops
>>caused by momentary (56 samples or so) dropouts in audio
>>(the signal drops, basically).
>>
>>I first thought it might be my soundcard (Aark Direct Pro),
>>but it records perfectly in SoundForge.
>>
>>Help!!?! I can manually draw in the dropouts because
>>they're so tiny, but this is getting to be a real problem.
>>
>>Thanks,
>>Sam Hardy

ThomasATL wrote on 11/6/2000, 12:26 AM

Sam, is this the same as stuttering. Because mine is stuttering
badly. I went to Roger Nichol's board and he said this:

"These stuttering problems are always sync problems. Not SMPTE or
MIDI or MTC sync, but digital audio input sync.
I am not familiar with your software, but somewhere there is a
preferrence or a setting or a menu click that will sync to either
INTERNAL or DIGITAL INPUT. If this is set properly the stuttering
will go away. It is possible that you have it set correctly and some
other piece of software is blocking it, but one of the software
programs will let you straighten it out.

Look in the manual under "Recording From Digital Input" It has to say
how to set the sync to the digital input port."

Roger

Can anyone else comment?

Sam Hardy wrote:
>>I wanted to add info about my system if it helps:
>>
>>PIII 700 mhz processor
>>Ultra-160 SCSI disk for audio + virtual memory, 5400RPM DMA drive
for
>>apps
>>256 mb ram
>>Windows 98 R2
>>Vegas Video 2.0a
>>Aark Direct Pro sound card for record/playback.
>>
>>I'm dreading that my problem is that i'm not using 98SE? I really
>>hate rebuilding my system, takes hours.
>>
>>The problem restated:
>>Recorded tracks are being written to the disk with occaisional 14-
to
>>56-sample dropouts, causing pops in the track and generally being a
>>bad thing.
>>
>>This did not happen to me with Sound Forge or with Vegas 1.x; also,
>>it happens no matter how many or few tracks are in the project: a
>>brand-new project with no tracks will still record gaps into the
>>first track recorded into the project.
>>
>>Any help is tremendously appreciated. Thanks!
>>
>>Sam Hardy
>>
>>Sam Hardy wrote:
>>>>I am experiencing troublesome dropout glitches recording in
>>>>vegas video; basically, any given track will have pops
>>>>caused by momentary (56 samples or so) dropouts in audio
>>>>(the signal drops, basically).
>>>>
>>>>I first thought it might be my soundcard (Aark Direct Pro),
>>>>but it records perfectly in SoundForge.
>>>>
>>>>Help!!?! I can manually draw in the dropouts because
>>>>they're so tiny, but this is getting to be a real problem.
>>>>
>>>>Thanks,
>>>>Sam Hardy

PipelineAudio wrote on 11/6/2000, 3:03 PM

I think you are on the right track...I amny times have this problem
and am convinced it is a CLOCK issue....a couple pages back I had
some posts on this...

Trouble is, as far as I can tell, there is NO way in vegas to tell it
what to sync to...it does its own thing which I suspect is lock to
the clock of the device on bus output A

I have this problem with a Toyz-R-Us Echo Gina card, if I set it to
SPDIF in the gina mixer app, it will cause little rice krispies style
clicks and pops in my audio...if set to internal, its ok

However, my mixtreme card, locked to either internal or to my DA-88
TDIF clock, never goes snap crackle or pop on me...so who knows?

Rednroll wrote on 11/6/2000, 10:25 PM

You're running into the basic rules of digital audio. You must tell
your hardware where to receive the "Word Clock" from, if you set it
wrong you will get clicks and pops due to the digital signal not
being properly synced from "the source". Here's the basic rule to
live by. Always make your source the master "word clock". Let's say
you're taking in digital audio either from a DAT or a CD. You want
to then set your soundcard to "External" to receive the wordclock
for "the source" (ie your DAT or CD player). If you're playing back
from Vegas and mixing to a DAT, then you want to set your soundcard
to "Internal", because Vegas is now the "source" and your Dat player
will sync to your soundcards word clock. If you just remember to set
the "source" of the audio as the "wordclock" you will never have
digital syncing problems.

Aaron Carey wrote:
>>
>>I think you are on the right track...I amny times have this problem
>>and am convinced it is a CLOCK issue....a couple pages back I had
>>some posts on this...
>>
>>
>>Trouble is, as far as I can tell, there is NO way in vegas to tell
it
>>what to sync to...it does its own thing which I suspect is lock to
>>the clock of the device on bus output A
>>
>>I have this problem with a Toyz-R-Us Echo Gina card, if I set it to
>>SPDIF in the gina mixer app, it will cause little rice krispies
style
>>clicks and pops in my audio...if set to internal, its ok
>>
>>However, my mixtreme card, locked to either internal or to my DA-88
>>TDIF clock, never goes snap crackle or pop on me...so who knows?

ChrisBo wrote on 11/7/2000, 12:29 AM

Y'ins might want to read through the thread I started about a day
before you (11/4/00) We're talking what might be similar problems.
Word Clock is the first thing to conquer.. some devices provide word
sync, some will read word sync from another source. Keep in mind that
word Clock is sent via most digital formats. The heartiest is 48K
Word Clock.. it's a BNC connector that ONLY supplies a digital Clock.
You can also read the clock signal from ADAT light pipe, TDIF,
S/PDIF, AES/EBU, etc...

There's a great application note on www.frontierdesign.com (they also
make a great series of A/D - D/A converters and Digital IO
interfaces). The notes are designed for they're products, but there's
some great general info there too.

If you can monitor your inputs without a problem, and only get clicks
and pops when you're recording - there's a good chance you have some
type of driver conflict or something

Good Luck!
ChrisBo

Brian Franz wrote:
>>You're running into the basic rules of digital audio. You must tell
>>your hardware where to receive the "Word Clock" from, if you set it
>>wrong you will get clicks and pops due to the digital signal not
>>being properly synced from "the source". Here's the basic rule to
>>live by. Always make your source the master "word clock". Let's
say
>>you're taking in digital audio either from a DAT or a CD. You want
>>to then set your soundcard to "External" to receive the wordclock
>>for "the source" (ie your DAT or CD player). If you're playing back
>>from Vegas and mixing to a DAT, then you want to set your soundcard
>>to "Internal", because Vegas is now the "source" and your Dat player
>>will sync to your soundcards word clock. If you just remember to
set
>>the "source" of the audio as the "wordclock" you will never have
>>digital syncing problems.
>>
>>Aaron Carey wrote:
>>>>
>>>>I think you are on the right track...I amny times have this
problem
>>>>and am convinced it is a CLOCK issue....a couple pages back I had
>>>>some posts on this...
>>>>
>>>>
>>>>Trouble is, as far as I can tell, there is NO way in vegas to tell
>>it
>>>>what to sync to...it does its own thing which I suspect is lock to
>>>>the clock of the device on bus output A
>>>>
>>>>I have this problem with a Toyz-R-Us Echo Gina card, if I set it
to
>>>>SPDIF in the gina mixer app, it will cause little rice krispies
>>style
>>>>clicks and pops in my audio...if set to internal, its ok
>>>>
>>>>However, my mixtreme card, locked to either internal or to my
DA-88
>>>>TDIF clock, never goes snap crackle or pop on me...so who knows?

Rednroll wrote on 11/7/2000, 3:36 PM

Word clock has nothing to do with sampling rate. Word clock, tells
the digital device where the beginning of the "digital Word" starts
to begin...if you have a 16 bit device then your "digital Word" is 16
bits long. The "word clock" is just a pulse to let the system know
when to start counting those 16 bits. I do have a bachelors degree
in Electrical Engineering and therefore do have some experience and
knowledge in this area.

Christopher Boyd wrote:
>>Y'ins might want to read through the thread I started about a day
>>before you (11/4/00) We're talking what might be similar problems.
>>Word Clock is the first thing to conquer.. some devices provide
word
>>sync, some will read word sync from another source. Keep in mind
that
>>word Clock is sent via most digital formats. The heartiest is 48K
>>Word Clock.. it's a BNC connector that ONLY supplies a digital
Clock.
>> You can also read the clock signal from ADAT light pipe, TDIF,
>>S/PDIF, AES/EBU, etc...
>>
>>There's a great application note on www.frontierdesign.com (they
also
>>make a great series of A/D - D/A converters and Digital IO
>>interfaces). The notes are designed for they're products, but
there's
>>some great general info there too.
>>
>>If you can monitor your inputs without a problem, and only get
clicks
>>and pops when you're recording - there's a good chance you have
some
>>type of driver conflict or something
>>
>>Good Luck!
>>ChrisBo
>>
>>Brian Franz wrote:
>>>>You're running into the basic rules of digital audio. You must
tell
>>>>your hardware where to receive the "Word Clock" from, if you set
it
>>>>wrong you will get clicks and pops due to the digital signal not
>>>>being properly synced from "the source". Here's the basic rule
to
>>>>live by. Always make your source the master "word clock". Let's
>>say
>>>>you're taking in digital audio either from a DAT or a CD. You
want
>>>>to then set your soundcard to "External" to receive the wordclock
>>>>for "the source" (ie your DAT or CD player). If you're playing
back
>>>>from Vegas and mixing to a DAT, then you want to set your
soundcard
>>>>to "Internal", because Vegas is now the "source" and your Dat
player
>>>>will sync to your soundcards word clock. If you just remember to
>>set
>>>>the "source" of the audio as the "wordclock" you will never have
>>>>digital syncing problems.
>>>>
>>>>Aaron Carey wrote:
>>>>>>
>>>>>>I think you are on the right track...I amny times have this
>>problem
>>>>>>and am convinced it is a CLOCK issue....a couple pages back I
had
>>>>>>some posts on this...
>>>>>>
>>>>>>
>>>>>>Trouble is, as far as I can tell, there is NO way in vegas to
tell
>>>>it
>>>>>>what to sync to...it does its own thing which I suspect is lock
to
>>>>>>the clock of the device on bus output A
>>>>>>
>>>>>>I have this problem with a Toyz-R-Us Echo Gina card, if I set
it
>>to
>>>>>>SPDIF in the gina mixer app, it will cause little rice krispies
>>>>style
>>>>>>clicks and pops in my audio...if set to internal, its ok
>>>>>>
>>>>>>However, my mixtreme card, locked to either internal or to my
>>DA-88
>>>>>>TDIF clock, never goes snap crackle or pop on me...so who knows?