Spotting Lossy Sources--links inside **2020 UPDATES**

[guygee]

Originally Posted by U2Lynne

I fixed the links to threads in the bottom post. Are those what you are talking about?

Yes Lynne, Thank You!

[Samizdat]

Anyone care to take a stab at these guys?:

[Five]

probably lossless with very poor frequency response... can't say anything conclusive looking at EAC caps. read the beginning of this thread & post back
http://www.thetradersden.org/forums/...8&page=1&pp=15

[Samizdat]

In an effort to provide plenty of information to you folk who are good at interpretation, I have made screenshots including the waveform and spectral views, frequency analysis and phase analysis displays by Cool Edit Pro 2.1 .

The track is "Slaves of Pain" by Sepultura - June 7, 1991 - Noorderlight - Tilburg, Holland
Format: FLAC
Version: Audience

Total track length: 3:57.426
Selected length: 2:21.460

waveform


spectral


Hanning


Blackmann-Harris


Triangular


Hamming


Blackmann


Welch (Gaussian)

[Samizdat]

phase

[paddington]

^^^ this looks ok, but please post (only) a spectrum analyzer shot, in color, with about a 3 or 4 second span for confirmation.

thanks.

[Samizdat]

Originally Posted by jameskg

^^^ this looks ok, but please post (only) a spectrum analyzer shot, in color, with about a 3 or 4 second span for confirmation.

thanks.

I've tested quite a few different frequency analysis programs, from EAC to Cool Edit, but never did I see anything about a "span."

You process the .wav file, you analyze it. How doe you do a "span" in Cool Edit Pro 2.1?

[paddington]

span, meaning time range...

I'd like to see a few seconds, in color, rather than the entire thing squashed together in B&W.

View the spectrum, highlight 3-4 seconds and hit that 'zoom to selection' button.

[Five]

yeah james means set it to a 2-second view setting and just post the spectral. this one's most probably okay from what I've seen here so far but there's some things in the grain you just can't see with 4mins crammed into the window.

[pattison2]

have a show where there is a sharp dropoff at just over 20 khz (20386hz); (mp3's are usually at 16 khz). checked with tlh and it says sourced from cdda. would this be lossy or lossless?

[uninvited94]

Originally Posted by pattison2

have a show where there is a sharp dropoff at just over 20 khz (20386hz)

Doesn´t that also happen with VHS-sourced material, only with this visible "pilot tone" left from the dropoff? I have some shows by myself with the dropoff in that area, probably VHS-sourced.

[ameyer17]

I don't think a sharp dropoff over 20 kHz is a VHS thing.
It's not that uncommon for a lowpass filter at about 20 kHz to be used when mastering something to 16/44.1 for some reason that escapes me at the moment.

[Chaosu]

Not that long ago I asked a question about sample and was misleaded with analysis in Audacity because i picked wrong calculating function, anyway, I figured that You can also check spectrum in Audacity. Perhaps it's obvious (took me some time and I found it accidentally) but it's was never mentioned in this topic. This is much faster for spectrum than real-time analyzers like Spectrogram 16 which I used before for spectrum. Hope that helps.

[Five]

thanks for the post!

also note that in audacity you need to go into preferences>spectrograms and change the maximum frequency to 22050Hz (the default is something like 8kHz, which is not very useful for our purposes...).

[pissah]

Hello! has anybody had trouble with Trader's Little Helper's tool for checking for lossy files?
I have taped a few things straight to WAV, then after a bit of tweaking and EQing I often get a "source cannot be specified" or even "looks like MP3"
I KNOW there was no mp3 in the lineage so what's up with that??