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can this recording be saved?

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Lara Michaels
can this recording be saved?
on Mar 4, 2015 at 3:33:29 am

I shot an important interview this morning. Throughout our shot, there
were snow-removal bulldozers outside and, whenever they went into
reverse, they would produce a regular beep besides the low-frequency
noise of their engines. No other room was available and this person
would not be available on a different date, so we went ahead anyway.

At this stage I just need to assess the damage from the bulldozers and their beeping.

Can this be saved?

10-sec clip from the boomed schoeps mic:

http://s000.tinyupload.com/download.php?file_id=00025419131961184335&t=0002...

10-sec clip from the lav:

http://s000.tinyupload.com/index.php?file_id=03717486344654899614


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John Fishback
Re: can this recording be saved?
on Mar 6, 2015 at 10:26:09 pm
Last Edited By John Fishback on Mar 6, 2015 at 10:26:30 pm

I couldn't download either of the clips. From your description I think iZotope RX 4 Advanced (maybe even regular old RX4) would be able to remove the beeps. It's fairly straight-forward. But it's a manual selection for every beep, so a bit time consuming.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.9.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCP-X 10.1.3, Motion 5.0.7, Compressor 4.0.7
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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Lara Michaels
Re: can this recording be saved?
on Mar 6, 2015 at 10:40:16 pm

Sorry the links look like they expired! Here they go again:

lav: http://s000.tinyupload.com/index.php?file_id=38402640006602832072

boom: http://s000.tinyupload.com/index.php?file_id=90210742632664692415


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John Fishback
Re: can this recording be saved?
on Mar 7, 2015 at 5:19:23 pm

The challenge with iZotope will be to identify the beep in its visual display since it's very soft. However, it would appear as a fairly straight line at its frequency. Here's a page at izotope.com that shows a number of ways it can be used yo remove unwanted sounds. RX4 would probably do what you need.





However, as the beep seems to be a particular frequency and not very loud, you might be able to use a parametric equalizer to remove most if not all of it - without hurting the dialogue. Apply a parametric eq to the clip. Then, adjust the Q to a narrow range and boost the gain a lot. Then, play the clip and sweep the frequency control until the sound of the beep is at its loudest. Then, further adjust the Q and frequency settings to maximize the beep. Finally, turn down the gain until the beep is greatly reduced or eliminated. The narrower the Q the better, as a narrow Q would least impact the dialogue.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.9.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCP-X 10.1.3, Motion 5.0.7, Compressor 4.0.7
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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Lara Michaels
Re: can this recording be saved?
on Mar 8, 2015 at 8:06:31 pm

Thank you so much for, John. I will try that.


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Evan Allen
Re: can this recording be saved?
on Jun 10, 2015 at 5:25:47 pm

Hi all!

In the case where it's difficult to visualize the particular audio issue in RX, there's a few things that might help:

First it might help to change the brightness of the spectrogram, by clicking and dragging the "dB" bar to the right of the screen.

Second, if you're dealing with beeps, it might help to switch the Spectrogram type to Adaptively Sparse, which is good for identifying harmonic content (like beeps!). The option to change Spectrogram type can found by right clicking on the spectrogram and selecting "view Spectrogram Settings."

And third, changing the Color map (also in the "view Spectrogram Settings" option) to one of the Multicolor options might help better highlight the problem!

Best,

Evan Allen
iZotope, Inc.
https://www.izotope.com/postproduction


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