Help removing echo with Vegas. at DVinfo.net

Ken Plotin · April 1st, 2004, 11:02 PM

Hi All,
I need help removing echo from an interview shot in a "live"room.
I seem to recall Vegas and/or Sound Forge being able to do this.
Anybody (Spot??) have a step by step for this?
Any help is really appreciated .
Ken

Douglas Spotted Eagle · April 1st, 2004, 11:04 PM

What kind of echo? If it's just room ambience, you can use the Acoustic Mirror that comes with Forge. It's a convoluted verb, so you can sample the room echo, and apply it against the original with the phase inverted. It's a decent fix, but not perfect. I often use the multiband EQ to do this too, but it's sort of hard to do a step by step. Almost a novel. :-)
Can you send me a sample of the noise, maybe I can build you a veg file.

Rob Lohman · April 2nd, 2004, 04:09 AM

Please see this thread as well. Thank you.

Ken Plotin · April 2nd, 2004, 05:54 PM

Thanks Spot,
Where would I email the file to?
Ken

Dan Lahav · April 3rd, 2004, 02:21 AM

Sorry to be a nag but an echo is a *complete* repetition of a sound (think Grand Canyon)... A tail to a sound (what you're talking about) is called a reverb. Just thought you should know :)

Douglas Spotted Eagle · April 3rd, 2004, 09:06 AM

Well...if we're gonna start tweaking semantics,(wich I hope we're not attempting to do, we all know what ken meant) a reverb is a diffused and multiple repeat of the original signal. during which the closely spaced repeats are at random and individual reflections cannot be distinguished.
An echo, by definition, may be a complete sound return, but also the perception of a non-diffused return of the original sound which may or may not contain the majority of original frequency information in the returned sound.
Therefore, a room or enclosed space may have echo and/or reverb, reverb only, or echo only.

(Syn-Aud-Con/Synergetics Audio Concepts Rules of Theory, 1978)

Dan Lahav · April 4th, 2004, 02:30 AM

Sorry Kevin. Im not trying to hijack this thread, it just seems like many people confuse reverb and echo :)

Here's what i've always learned:
Echo: Sound reflections delayed by 35ms or more that are perceived as discrete repetitions of the direct sound

Reverb: Multiple blended, random reflections of a sound wave after the sound source has ceased vibrating

(Audio in Media -6th Edition, Stanley R. Alten - 2002)

Harry Settle · April 6th, 2004, 03:42 PM

What did you record with. How many mics. How many channels. What was your camera/sound setup?

April 1st, 2004, 11:02 PM	#1
Ken Plotin Major Player Join Date: Jan 2004 Location: Los Angeles, CA Posts: 254	Help Rrmoving echo with Vegas. Hi All, I need help removing echo from an interview shot in a "live"room. I seem to recall Vegas and/or Sound Forge being able to do this. Anybody (Spot??) have a step by step for this? Any help is really appreciated . Ken

April 1st, 2004, 11:04 PM	#2
Douglas Spotted Eagle VASST Join Date: Jan 2004 Location: Stockton, UT Posts: 5,648	What kind of echo? If it's just room ambience, you can use the Acoustic Mirror that comes with Forge. It's a convoluted verb, so you can sample the room echo, and apply it against the original with the phase inverted. It's a decent fix, but not perfect. I often use the multiband EQ to do this too, but it's sort of hard to do a step by step. Almost a novel. :-) Can you send me a sample of the noise, maybe I can build you a veg file. __________________ Douglas Spotted Eagle/Spot Author, producer, composer Certified Sony Vegas Trainer http://www.vasst.com

April 2nd, 2004, 04:09 AM	#3
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Please see this thread as well. Thank you. __________________ 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

April 3rd, 2004, 09:06 AM	#6
Douglas Spotted Eagle VASST Join Date: Jan 2004 Location: Stockton, UT Posts: 5,648	Well...if we're gonna start tweaking semantics,(wich I hope we're not attempting to do, we all know what ken meant) a reverb is a diffused and multiple repeat of the original signal. during which the closely spaced repeats are at random and individual reflections cannot be distinguished. An echo, by definition, may be a complete sound return, but also the perception of a non-diffused return of the original sound which may or may not contain the majority of original frequency information in the returned sound. Therefore, a room or enclosed space may have echo and/or reverb, reverb only, or echo only. (Syn-Aud-Con/Synergetics Audio Concepts Rules of Theory, 1978) __________________ Douglas Spotted Eagle/Spot Author, producer, composer Certified Sony Vegas Trainer http://www.vasst.com

April 6th, 2004, 03:42 PM	#8
Harry Settle Major Player Join Date: Mar 2003 Location: Bemidji, MN Posts: 276	What did you record with. How many mics. How many channels. What was your camera/sound setup? __________________ "DOH"!!!

April 2nd, 2004, 05:54 PM	#4
Ken Plotin Major Player Join Date: Jan 2004 Location: Los Angeles, CA Posts: 254	Thanks Spot, Where would I email the file to? Ken

April 3rd, 2004, 02:21 AM	#5
Dan Lahav Regular Crew Join Date: Jul 2003 Location: CA Posts: 172	Sorry to be a nag but an echo is a complete repetition of a sound (think Grand Canyon)... A tail to a sound (what you're talking about) is called a reverb. Just thought you should know :)

April 4th, 2004, 02:30 AM	#7
Dan Lahav Regular Crew Join Date: Jul 2003 Location: CA Posts: 172	Sorry Kevin. Im not trying to hijack this thread, it just seems like many people confuse reverb and echo :) Here's what i've always learned: Echo: Sound reflections delayed by 35ms or more that are perceived as discrete repetitions of the direct sound Reverb: Multiple blended, random reflections of a sound wave after the sound source has ceased vibrating (Audio in Media -6th Edition, Stanley R. Alten - 2002)