Hi pitched whirring noise after rendering

[Rob Lindsay]

Bob

Where were the main culprit frequencies? This had to be more than a simple 20kz tone, right? And if so, could it have been interference from an external source?

I just did a test with the same audio setup, switching between the AGC “off” setting and the AGC “on” setting, rendered it out, and got no difference at all– and no noise at all. so now I’m wondering if it mat have been external. perhaps my low cost Chinese mixer is lacking in shielding some where?

Do you have a thought on it?

[Bob Peterson]

No, it was centered at 20112 hz with a volume which was about 70db higher than the frequencies below and above it. It began spiking at, if I’m reading Rx 3 correctly, 19906 hz, reached its peak, and returned to the average volume level at 20276 hz. There are no other significant peaks on the frequency curve. Rx3 displays the frequencies in a wave form as a secondary scale on its horizontal axis. There was a very narrow band which was quite loud. That was what made it easy to remove. I simply selected the band, and attenuated everything within the selection. The denoiser may have removed a few other peaks that perhaps complicated the issue.

I’m afraid I have no idea what caused it. In writing this note, I decided to be a little more precise with the repair by taking out just the band I mentioned above. In the first attempt, I simply drew a circle around the bar, so it took out a bit more of the high frequencies. I plan to send you this revised version.

[Rob Lindsay]

Bob

Thank you for the update. i am surprised then that the Sony EQ could not handle something as cut and dried as this.