Skip to main content ↑ ↓

Notice

Please note that most of the software linked on this forum is likely to be safe to use. If you are unsure, feel free to ask in the relevant topics, or send a private message to an administrator or moderator. To help curb the problems of false positives, or in the event that you do find actual malware, you can contribute through the article linked here.
Topic: How to reduce echo? (Read 3606 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

How to reduce echo?

Hi,
is it possible to reduce echo from record (it is voice) ?
It sounds like choral  but i need "clear" sound.

thx.

How to reduce echo?

Reply #1 –
Woah, dude!  Could you be a little more specific please.  What mic are you using?  What soundcard do you have?  What driver version do you have installed for it?  What version of Windows are you running?  What software are you using for recording?
gentoo ~amd64 + layman | ncmpcpp/mpd | wavpack + vorbis + lame
 

How to reduce echo?

Reply #2 –
Well, I think he is talking about an existing recording.

No, there is no filter that can distinguish wanted sounds from echo. Only your brain can.

How to reduce echo?

Reply #3 –
Quote
Woah, dude!  Could you be a little more specific please.  What mic are you using?  What soundcard do you have?  What driver version do you have installed for it?  What version of Windows are you running?  What software are you using for recording?

Its captured from digital camera. And record was done in a garage. So it sounds very disunderstandly.
I have just the wav file and I need make some digital processing for reduce echo.

How to reduce echo?

Reply #4 –
If you can reproduce the acoustic situation, you might have success with a convolution filter.
Try to record an impulse in this garage, at the same position where you made the first recording. But it will be very hard work to find the correct delay/phase/level of the impulse file.

Edit: this is only a theoretical assumption. I myself never tried to do so

How to reduce echo?

Reply #5 –
No, that won't work. I know the theory, but in practice, even if you got all other factors right (virtually impossible) the camcorder's AGC circuit will have messed it all up.

You could use some expansion (the opposite of compression) to reduce the loudness of the echo slightly. Very difficult to get right though, and the result probably won't be great. Try to set it so that the direct vocal sounds stay the same, but anything quieter is reduced in volume slighlty. Various audio processing packages can do it - I use Cool Edit Pro (now called Adobe Audition) but there are others. Don't expect wonderful results.

Cheers,
David.

How to reduce echo?

Reply #6 –
Quote
If you can reproduce the acoustic situation, you might have success with a convolution filter.
Try to record an impulse in this garage, at the same position where you made the first recording.

Actually this would be done with a deconvolution filter.

As 2BDecided mentioned, the camcorder's microphone and DSP very likely has made things very nonlinear though.