radio station interfence!!

tadpole wrote on 11/24/2002, 3:31 PM

double fudge....

just shot a wedding - 2 cams. Church had sound system and balcony
so i ran a cable from church pa into mic input on my balcony cam.
Did a quick check - everything seemed ok

Just reviewing the footage n thought someone had a radio on during the service!
turns out, the mic line i had picked up a radio broadccast from AM transmitter down the street!

Sound from cam1 isn't continuous nor acceptable qaul..

ANYTHING i can do?
Only thing i can think of, is get a recording of the broadcast from the radio station (don't they archive?) and find an app that can take out the radio portion from the track by using the original recording as a reference?

Any applications they can do that?
Is it possible?
lets hope!
thanks

Comments

Chienworks wrote on 11/24/2002, 4:49 PM

If you did get a recording of the radio broadcast, you could add it to your project as another audio track and invert the phase, then adjust the mix level until it cancels. This is going to be really tricky though. You'll have lots of variables to contend with: syncronization, difference in recording speed, level of signal, level of compression, clarity, eq, static noise & hum levels, etc ... the list goes on. It might be worth a shot, but unless the recording and your interference are very similar it won't do much for you.

Rednroll wrote on 11/24/2002, 9:26 PM

Next time, make sure you have shielded cables. That's what the shield is for, to elliminate stray signals from entering your audio. Other than that I'm going to say you're SOL on this one.

tadpole wrote on 11/25/2002, 2:57 PM

Thanks for the tips guys...live and learn..

One thing i forgot to mention though, the radio is really faint.
When there's a song playing, you can barely even distinguish it.

It is noticible during the pauses in the vowes though, which really sucks...
Sports scores in between vowes isn't what the bride was looking for.

The vowes and all other audio is clear & strong.
Anyways, could i adjust threshold values or something to trim off radio interference?

Haven't had much audio experience.
thanks

Rednroll wrote on 11/25/2002, 3:18 PM

You could do some creative editing. If the only time where it is objectionable is between, where there is very little action/noise present then here's what you can do.

Edit the original track and cut out all the audio between where the people aren't talking, therefore elliminating all the objectionable radio interference. This will now create drops where there is noise and then complete silence where you cut those parts out. Create another audio track. Find an area where there is "room tone" only, but hopefully no radio broadcast going on. Once you find a good clean section of room noise, enable it to loop and stretch it out throughout the entire new track you created. Put a volume envelope on the room tone and raise and lower the levels, so they fill in the gaps you cut out, and try and make it sound as natural as possible.

Good luck,
Red

RiRo wrote on 11/25/2002, 3:39 PM

Another posibility, rather than room tone you can use an instrumental background. Again, this could be dropped so the vows could be heard. Room tone will sound more natural, background will sound more canned. A third posibility is... did they tape it on a cassette from the mixing board? This could be a source of good (ok, decent) audio to lift the offensive parts from.

RiRo