KVR Audio

genie40204 · Post by **genie40204** » Mon Nov 13, 2017 11:30 am

Good morning KVR!

I need some help: I have a very old software program that allows for encoding of various audio formats. But, it also has a non-documented filter that is applied when files are encoded no matter the format.

Could anyone please help me out by telling me what type of filter is being applied (i.e. compressor, noise gate, EQ, etc.)?

Original
https://www.sendspace.com/file/fv09ke

Processed
https://www.sendspace.com/file/7vywui

Any help would be great!
Thanks everyone!

No_Use · Post by **No_Use** » Mon Nov 13, 2017 12:15 pm

Have you already tried putting the files in a DAW on two tracks, so they start at the exact same position, flip polarity on one track, play and listen what's the result ?

That's usually the first thing I'd do when trying to compare two differently processed files.

genie40204 · Post by **genie40204** » Mon Nov 13, 2017 1:04 pm

^^No I have not done that yet. I did quickly look at the waveforms though in a DAW and they look almost identical... Does that mean that it's not compression/limiting?

I will try what you suggested when I get home tonight.

Anyone else take a look at the samples and have any idea of what's going on?

iiphii · Post by **iiphii** » Mon Nov 13, 2017 5:17 pm

The audio files are identical. I computed the sample-wise difference between the two signals, and it was 0 for all samples.

genie40204 · Post by **genie40204** » Mon Nov 13, 2017 5:53 pm

iiphii wrote:The audio files are identical. I computed the sample-wise difference between the two signals, and it was 0 for all samples.

Well then case closed, thank you.

I could swear that I hear a fifference though -- is that possible? If you listen, do you hear a difference?

Thanks.

iiphii · Post by **iiphii** » Mon Nov 13, 2017 11:23 pm

It is not possible for them to sound different. To go even further, the files are exactly identical, byte by byte, and not just the decoded audio signals. To verify, I ran this from the terminal (from https://stackoverflow.com/questions/129 ... unix-linux)

Code: Select all

cmp --silent 0-original.flac 1-filtered.flac && echo '### SUCCESS: Files Are Identical! ###' || echo '### WARNING: Files Are Different! ###'

and the output was indeed

Code: Select all

### SUCCESS: Files Are Identical! ###

These are two identical files with different names.

What Is Going On Here?