Hi pitched whirring noise after rendering

[Mike Kujbida]

In your first post you said I captured the audio with a Sennheiser G3 lav into a brand new Saramonic DSLR mixer.
If it exists, that’s the audio file I’m looking for.

[Rob Lindsay]

Mike, it’s a mixer, not a recorder. I doesnt make a separate file, AFAIK, just adjusts the gain and sends the signal to the camera.

[Rob Lindsay]

I’ve talked to the sales rep and apparently the new unit will send a 20khz signal to the DSLR to turn off AGC. There is a switch to shut this down but the switch was in the on position.

I have tried a couple of the Sony audio filters to little effect. If this is a 20khz signal, there must be, as Saramonic told the rep, an “easy way to filter it”.

Can anyone recco the correct filters for this? I have tried the EQ with a High Shelf filter that looked pretty severe, but had little impact.

Thanks!

[Rob Lindsay]

Why would this noise be heard on the rendered MP$ and not at all in the Vegas project window?

I’m thinking the notch filter is the best of a bad set of choices. It’s not a 20kz tone, there are freq’s down to 5k.

[Bob Peterson]

20khz is at the upper limit of human hearing. That, plus the inability of the EQ to kill it, suggests that the noise is below 20khz. If you haven’t tried it, the Graphic Equalizer should absolutely kill any sound in that range. Just add two points to the curve, and pull the last section of the curve (15khz to 20khz for example)to -inf. If that does do it, you can slide those two points down to lower frequencies until it hits your noise. That will at least tell about what frequency it is.

BTW, you can render out a wav file by simply choosing wav for the kind of file you want the render to generate.

[Rob Lindsay]

Thanks, Bob. I have been working with the Graphic EQ and have had some success, but the noise is multi-frequency. And all over the +5k range.

I have been able to mute it at the expense of the voice quality of the speaker. I am really looking for a magic bullet here to avoid a reshoot.

I will upload a wav file soon.

[Rob Lindsay]

Here is the link to the wav file.

8785_lifetimehearingintrovideo.wav.zip

[Bob Peterson]

I processed the file in Izotope rx3 advanced. It does indeed have a 20khz tone which is quite large in amplitude, and which I can hear. I used the spectral repair tool in rx3 to remove this 20khz tone. There was still a little noise in the recording which I heard during the silent periods between the words the speaker was saying. I used rx3’s denoiser to reduce this noise substantially. It sounds much better to me, but I’m old enough that I’ve lost some of my ability to hear high frequencies. See what you think.

I’ve tried twice now to upload the file using the upload file icon, and it has not worked. Sorry, but it may be tomorrow before I can try to figure out how to do this upload.

[Bob Peterson]

OK,here is the link to the uploaded file;

https://forums.creativecow.net/readpost/334/8792

Now, I’ve got to try and remember how to add a link.

[Bob Peterson]

OK, I figured out the upload and link. I also downloaded and accessed the file. So all is working for me. Yes, I’ll be glad to send you my email.