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Hi Randy.  Can you make short mp3 of just that section?  Maybe 10 seconds
or so?  Then you could use a higher bit rate, and hopefully preserve it
better.  If you make the section short enough, you can even send it as an
uncompressed WAV.

I have lots of experience with restoration artifacts - maybe I could help
identify it.  Low bit rate MP3 can definitely sound like overzealous
de-noise artifacts, so maybe that's what it is and why the MP3 encoding
seemed to "gloss over" it.

Best,

Ellis


On Mon, Jun 2, 2014 at 6:24 PM, Randy A. Riddle <[log in to unmask]>
wrote:

> As I mentioned before, I'm working on a discography of Old Time Radio
> programs released on lps.
>
> There's something odd I keep running into with Dave Goldin's Radiola
> releases, particularly the later issues that date from the mid to late 80s.
>
> On some shows, there's an odd momentary "warble" in the sound.  It most
> often crops up in shows that have some surface noise and I've heard it on
> both the lp and cd versions of the albums.
>
> I was wondering if this was some type of early digital click removal
> software or hardware and what it might be.
>
> I tried making an mp3 of one of the shows, but the compression seems to
> gloss it over and you can't hear it very well.
>
> I'm wanting to note shows in the discography that have this odd "warble",
> but I'm not sure how to refer to it.
>
> It seems to have been used selectively on major scratches - it's not an
> artifact of broader digital noise reduction like CEDAR.
>
> Randy
>



-- 
Ellis
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818-846-5525