Echo Heard During Capture, but not in file at DVinfo.net

Sam Houchins II · July 10th, 2003, 04:09 PM

I'm practicing with my new copy of Vegas on something "easy" (I thought) before I tackle anything too serious. I was capturing some Hi-8 tapes of an old wedding, and while capturing, I hear an equally loud echo through the computer speakers, but not from the vid cam. Thankfully, after capture segment is done, the echo is not present, but it makes for very annoying and disconcerting monitoring of the capture process. I'm capturing through an ATI Radeon 7500 All in Wonder card, using S cable and Stereo RCA jacks into a 3.06G comp, 512 MBRAM.
Any ideas?
Thanks

Gints Klimanis · July 10th, 2003, 04:56 PM

If the delay or echo time is very small, your sound card is setup to monitor your analog or microphone inputs. If your delay time is 50-200 mSec, the monitoring is probably done by your capture application. Are both the signal *and* echo present in your computer speaker output? If so, you should turn off one of the monitor functions.

You can access your sound card functions from:

Control Panel -> Sounds and Multimedia
For sound Playback, click on the Volume Tab.
Enable mute on your microphone and line-in signals.
This should reduce the monitor but not record level
of your camcorder audio. Be sure to do a test run
before a big capture. If you're on the Recording panel
instead of the playback panel, you'll reduce your
recording volume.

Sam Houchins II · July 11th, 2003, 06:54 AM

Thank you for your step-by-step instructions. Experimenting came up with some interesting finds:
When I muted the volume of the line in (playback not rec. like you said), the result was that the echo was gone, but the sound appeared during capture to be out of sync. On playback of the test file, it was fine & in sync.
Following another's idea, they'd steered me to a Vegas option during capture, "preview audio", which I disengaged. Now there was no apparent sound during capture or recorded (slightly odd).
Unmuting line in volume under control panel, and leaving preview audio disabled in Vegas, resulted in apparent in-sync audio during capture, and in sync results on recording playback.
I didn't realize the out of sync redundancy that was ocurring giving the echos. Thanks for helping out with the detailed instructions that led to successfully troubleshooting my prob :-)

Rob Lohman · July 11th, 2003, 07:25 AM

If you turn of "preview audio" it is understandable you don't hear
any, that is what that function does.

What kind of capture equipment are you using? Normally your
line in has no business at all in a DV capture session.

Sam Houchins II · July 11th, 2003, 08:26 AM

>>"I'm capturing through an ATI Radeon 7500 All in Wonder card, using S cable and Stereo RCA jacks into a 3.06G comp, 512 MBRAM."<<

The ATI Radeon 7500 AIW has a 3' extension wire with block from the back of the card providing for easy connection of audio and video input. The audio 's transferrence to the soundcard, however is via an external jumper wire from ATI's audio out to soundcard's line in.

Rob Lohman · July 11th, 2003, 08:51 AM

Ah... your doing an analog capture instead of digital. My bad.

July 10th, 2003, 04:09 PM	#1
Sam Houchins II Major Player Join Date: Jun 2003 Location: Fredericksburg, VA Posts: 282	Echo Heard During Capture, but not in file I'm practicing with my new copy of Vegas on something "easy" (I thought) before I tackle anything too serious. I was capturing some Hi-8 tapes of an old wedding, and while capturing, I hear an equally loud echo through the computer speakers, but not from the vid cam. Thankfully, after capture segment is done, the echo is not present, but it makes for very annoying and disconcerting monitoring of the capture process. I'm capturing through an ATI Radeon 7500 All in Wonder card, using S cable and Stereo RCA jacks into a 3.06G comp, 512 MBRAM. Any ideas? Thanks

July 11th, 2003, 06:54 AM	#3
Sam Houchins II Major Player Join Date: Jun 2003 Location: Fredericksburg, VA Posts: 282	That helped me find the fix, thanks Thank you for your step-by-step instructions. Experimenting came up with some interesting finds: When I muted the volume of the line in (playback not rec. like you said), the result was that the echo was gone, but the sound appeared during capture to be out of sync. On playback of the test file, it was fine & in sync. Following another's idea, they'd steered me to a Vegas option during capture, "preview audio", which I disengaged. Now there was no apparent sound during capture or recorded (slightly odd). Unmuting line in volume under control panel, and leaving preview audio disabled in Vegas, resulted in apparent in-sync audio during capture, and in sync results on recording playback. I didn't realize the out of sync redundancy that was ocurring giving the echos. Thanks for helping out with the detailed instructions that led to successfully troubleshooting my prob :-)

July 11th, 2003, 07:25 AM	#4
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	If you turn of "preview audio" it is understandable you don't hear any, that is what that function does. What kind of capture equipment are you using? Normally your line in has no business at all in a DV capture session. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

July 11th, 2003, 08:26 AM	#5
Sam Houchins II Major Player Join Date: Jun 2003 Location: Fredericksburg, VA Posts: 282	capturing equipment >>"I'm capturing through an ATI Radeon 7500 All in Wonder card, using S cable and Stereo RCA jacks into a 3.06G comp, 512 MBRAM."<< The ATI Radeon 7500 AIW has a 3' extension wire with block from the back of the card providing for easy connection of audio and video input. The audio 's transferrence to the soundcard, however is via an external jumper wire from ATI's audio out to soundcard's line in.

July 11th, 2003, 08:51 AM	#6
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Ah... your doing an analog capture instead of digital. My bad. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

July 10th, 2003, 04:56 PM	#2
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	If the delay or echo time is very small, your sound card is setup to monitor your analog or microphone inputs. If your delay time is 50-200 mSec, the monitoring is probably done by your capture application. Are both the signal and echo present in your computer speaker output? If so, you should turn off one of the monitor functions. You can access your sound card functions from: Control Panel -> Sounds and Multimedia For sound Playback, click on the Volume Tab. Enable mute on your microphone and line-in signals. This should reduce the monitor but not record level of your camcorder audio. Be sure to do a test run before a big capture. If you're on the Recording panel instead of the playback panel, you'll reduce your recording volume.