IPB

Welcome Guest ( Log In | Register )

Distinguishing between lossless and lossy
Unrealmaster287
post Apr 27 2012, 11:44
Post #1





Group: Members
Posts: 9
Joined: 24-December 11
Member No.: 96002



Hey,

I would like to ask a question about lossless audio. How can you distinguish between a lossless song and one which has just been converted into a lossless format but isnít actually lossless.

From what I understand you have to use a spectrum analyzer, but that is the extent of what I understand.

Thank you so much in advance wink.gif
Go to the top of the page
+Quote Post
 
Start new topic
Replies
j7n
post Apr 28 2012, 02:10
Post #2





Group: Members
Posts: 813
Joined: 26-April 04
Member No.: 13720



Besides a sharp cutoff, lossy encodes also have the upper spectrum in large, unmistakable chunks, that are encoded only when the signal is above a certain threshold, and rapidly appear and disappear during playback. Otherwise the cutoff is even lower. This screenshot shows a 320 kBit/s high quality MP3. Notice the missing chunk near 16k.

http://www.fileden.com/files/2012/4/26/3297107/juliasays.png

Even after moderate processing, such as a radio transmission, MP3 files can be recognized by this anomaly from streams that have merely been band-limited with a sharp digital filter.
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 30th October 2014 - 18:13