|Checksums||shn-md5 , st5|
|Disc Counts||2 / 3|
|Source Summary||Sbd > Cassette Master > Dat x 2 > CDR > SHN; plus AUD patches from Jeff Silberman Senn source (see info file); to gdlive via Bob Harrell Note: This is exactly the same seed as the one seeded to etree with the same lineage, but it has noise reduction applied and was seeded to gdlive. ; upgrade in circulation|
|Other Sources (comments)
FOB Sennheiser 441's >... (0) Sbd > Cassette Master > Dat... (0) Peter Braverman 'fix' of... (3) noise-reduced and Bertha... (3) Recording Info: Beyer M160... (0) flac16; Recording... (0) flac16; Lineage:... (2) flac16; Lineage:... (0) flac16; Beyerdynamic... (0) flac16; source:... (0) flac16; 2 source... (0) flac24; Updated... (0) flac16; 2 Source... (0) flac16; Master... (0) flac24; Master... (0) flac24; Updated... (2) flac16; Updated... (2) flac16/48kHz; Jim... (0) flac24; Jim Wise's... (0)
|01/15/2003||Willy||Is there any more info available as to who did the processing? Tx, Willy|
|01/16/2003||Ben Neuman||If you read the comments on the similar pair of 10.15.83, you'll see that Bob Harrell seeded both the non-NR copy to Etree and his own, personally NRed copy to GDLive. The situation appears to be the same here.|
Unfortunately, this source was found to have some type of compression scheme applied. I am not sure which of the lossy formats was used, but the compression can be clearly seen in frequency analysis. I have not tested the source used to produce this version, but will do so once I can get ahold of a copy.
I have tested both noise reduction and compression extensively. Noise reduction can be seen at the high end as scalloping or slight dropoff. Compression such as mp3 is very different. I will be happy to show anyone interested how to detect it.
I can be contacted at: [email protected]
This is a compressed source and I stand by my analysis.
|05/10/2004||Jay, can you please explain how you've come to the conclusion that this seed is from a lossy compressed source?|
|05/10/2004||Alex||Frequency analysis. A diagram of the frequency shows if the audio file is compressed or lossless. It can easily be seen as the upper regions of the frequency is totally black on MP3-files, meaning loss in quality, while lossless audio files have the peaks going all the way up. It?s not too easy to explain, I think Jay can do it better, and it?s much easier with actual screenshots. It can be done using the Tools in EAC and i?m using it regularly to check on sources from SharingTheGroove, for instance. The difference between compressed and un-compressed are very easy to detect.|
I finally got to look at the source this source was said to be made from. Though the frequency analysis has many points that are similar to Mini Disc compression, I just don't think there are enough to conclude the original source has MD in the lineage.
Therefore, I am reversing my original conclusion. I believe the original source, and thus, this source, DO NOT have compression in the lineage.
I believe the anomolies are due to the upper limit of the cassette deck used for transferring. Coincidentally, that limit is around 18khz, which is the same frequency where the MD signature appears.
Keep in mind, this is not an exact science, however, through testing and comparing known souces it becomes easier to detect sources that are not what they are purported to be. And, there are a whole lot of those circulating.
In response to Alex. Yes, the high frequency range is where compression is detected. There are many types of compression, however. Mini Disc is not so straight forward to detect as mp3. And, some mp4 files are nearly impossible to detect. I first look at the signature as the track is playing. This gives a good overall picture, ie, cassette, pcm, compression. Then, if there are anomolies, I will look at individual points on the frequency analyzer, moving through the entire wav file to see if the anomoly is consistant. Between frequency analysis and spectral analysis, everything from FM to Noise Reduction to Compression can be detected.
|12/21/2004||Diana||Discursive chitchat/flamebait now pruned.|