Transition between recording sessions

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Re: Transition between recording sessions

Permanent link to this post Posted by solobo » Sat Jan 28, 2017 3:13 pm

Well I tried increasing microphone gain and volume and computer volume and playing back through the computer. It was still hard to locate any change of hum inside the closet when I moved the mic around, and nothing changed when I touched the mic. I did notice a slight change when I got down close to where my desktop sat on the other side of the wall, though, so I decided to drill a hole in the wall so that cord length would allow me to put the desktop about 4 feet away, and that seems to have solved it! When I plot the spectrum of noise, I rarely have any 120 hz peaks, and when I do they never seem to be higher than -70dB or so.

I also decided to re-record, being more careful about maintaining mic position between recordings. Here's the (raw) transition between a recording I finished last night and one I started this morning. The difference seems much less pronounced to me.

Any other thoughts on the sound quality of this sample? Does it sound like decently clean raw audio?

transition1b-2b.wav
Transition between "river" and "at last". First silence has a 130hz peak (not sure why), but other silences seem clean around 120hz.
(1.46 MiB) Downloaded 18 times
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Re: Transition between recording sessions

Permanent link to this post Posted by flynwill » Sat Jan 28, 2017 3:53 pm

Indeed you appear to have the hum problem sorted.

That is a very workable test recording. I had to apply a small amount of compression to get it to meet the ACX rms-peak requirements, and used the "LF Rolloff for Speech" equalization curve to get rid of the 1/f noise -- that improves the S/N ratio by about 3 dB.
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Re: Transition between recording sessions

Permanent link to this post Posted by kozikowski » Sat Jan 28, 2017 5:47 pm

Slight variation on how I did it. We both found your subliminal rumble interference and saw it was part of your noise shortcoming. That's the LF-Rolloff thing.

Screen Shot 2017-01-28 at 9.38.11 AM.png
Screen Shot 2017-01-28 at 9.38.11 AM.png (42.7 KiB) Viewed 177 times


I applied the Custom Nyquist SetRMS and then Limiter followed by Custom LF-Rolloff.

I basically did this.

http://kozco.com/tech/audacity/ACXMaste ... ering.html

Because of the rumble problem, we both went straight for LF-Rolloff instead of noise reduction.

Odd that it took two custom-written tools to get there. But anyway. Is your presenting style appropriate to the work? Do you sound more upbeat if you're reading a rollicking comedy?

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Re: Transition between recording sessions

Permanent link to this post Posted by solobo » Sat Jan 28, 2017 5:55 pm

Cool, glad I'm finally getting to workability here.

Ha, yes, I suppose I'd present differently on a rollicking comedy. I'm reading one of my short stories here as a test case before I start recording audio for one of my novels.
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Re: Transition between recording sessions

Permanent link to this post Posted by kozikowski » Sat Jan 28, 2017 9:19 pm

Getting the microphone to work is only first of three parts. Then you have to pass Theatrical Quality which is judged by Human Quality Control at ACX followed by actual theater. We have to enjoy what you're doing.

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