IPB

Welcome Guest ( Log In | Register )

Am I correct that decompressing to WAV cannot reverse loss of quality?, [TOS #6: was "mp3 to wav quality" in General Audio]
Paul77
post Apr 18 2012, 14:59
Post #1





Group: Members
Posts: 4
Joined: 18-April 12
Member No.: 98943





Hi

I have just used winamp to convert some mp3 files to wav for recording to cd (as the tracks are only available on Amazon as mp3 currently).

Wav's are 7 or 8 times the size of mp3's due to the compression. When you decompress to wav can you only ever get the quality that was present in the mp3. That is when the mp3 was created from the original source some loss of quality is inevitable and decompressing to wav presumably cannot reverse that loss of quality so my wav files presumably cannot sound as good as on a purchased CD.

Can someone confirm this is about right or have I missed something?

Go to the top of the page
+Quote Post
 
Start new topic
Replies
Gainless
post Apr 21 2012, 23:59
Post #2





Group: Members
Posts: 173
Joined: 28-October 11
Member No.: 94764



I actually thought that the mp3 algorithm can make use of less information by distorting some sounds with overdrives, and just wondered if this clipping distortion can be exactly or just "approximately" recreated in a WAV file, as a gain higher than 1.00 is simply not possible, but seems to be in mp3 files. So the question is basically for me: Does a WAV contain exactly the same information as a decoded mp3 stream out of any audio player?
Go to the top of the page
+Quote Post
splice
post Apr 22 2012, 00:30
Post #3





Group: Members
Posts: 125
Joined: 23-July 03
Member No.: 7935



QUOTE (Gainless @ Apr 21 2012, 15:59) *
... So the question is basically for me: Does a WAV contain exactly the same information as a decoded mp3 stream out of any audio player?


Yes.

Think of it this way:
The decoder converts the MP3 information to standard 16 bit audio samples (assuming the original source was 16 bit stereo audio).
These samples can be:
- Fed to the DAC in your player so you can hear them.
- Written to a WAV file.
- Written to a CD.



--------------------
Regards,
Don Hills
Go to the top of the page
+Quote Post

Posts in this topic
- Paul77   Am I correct that decompressing to WAV cannot reverse loss of quality?   Apr 18 2012, 14:59
- - Kohlrabi   That's about right, though good good MP3 encod...   Apr 18 2012, 15:10
- - JimH   QUOTE (Paul77 @ Apr 18 2012, 08:59) I hav...   Apr 18 2012, 16:31
- - greynol   If such software doesn't honor gapless decodin...   Apr 18 2012, 16:39
|- - Paul77   I was using XP CD burner software so I don't t...   Apr 18 2012, 16:51
|- - dhromed   QUOTE (Paul77 @ Apr 18 2012, 16:51) I was...   Apr 18 2012, 18:39
|- - Paul77   QUOTE (dhromed @ Apr 18 2012, 18:39) QUOT...   Apr 19 2012, 16:32
|- - db1989   Notwithstanding that being pretty obvious, the poi...   Apr 19 2012, 16:36
||- - greynol   To add to dB1989's post, the mp3 must be compa...   Apr 19 2012, 17:52
||- - Paul77   Ok so the idea is to create an mp3 from the lossle...   Apr 20 2012, 13:37
||- - soulsearchingsun   http://wiki.hydrogenaudio.org/index.php?title=ABX ...   Apr 20 2012, 13:49
||- - db1989   QUOTE (Paul77 @ Apr 20 2012, 13:37) Ok so...   Apr 20 2012, 14:15
|- - pdq   QUOTE (Paul77 @ Apr 19 2012, 11:32) Have ...   Apr 19 2012, 17:02
- - greynol   That doesn't sound like it would be a proper a...   Apr 18 2012, 17:32
- - db1989   . . . because any compressed format (whether lossy...   Apr 18 2012, 18:55
- - benski   Decompressing an MP3 to WAV is the exact same proc...   Apr 18 2012, 18:56
|- - Gainless   QUOTE (benski @ Apr 18 2012, 18:56) Decom...   Apr 19 2012, 11:31
|- - greynol   QUOTE (Gainless @ Apr 19 2012, 03:31) But...   Apr 19 2012, 15:25
|- - Gainless   QUOTE (greynol @ Apr 19 2012, 15:25) QUOT...   Apr 21 2012, 12:05
- - DonP   With the right burner software, feeding it the mp3...   Apr 19 2012, 11:45
- - db1989   That is nonsensical. Notwithstanding that any such...   Apr 21 2012, 12:21
- - lvqcl   What do you mean by "the "sound" of...   Apr 21 2012, 12:23
- - Gainless   I actually thought that the mp3 algorithm can make...   Apr 21 2012, 23:59
|- - splice   QUOTE (Gainless @ Apr 21 2012, 15:59) ......   Apr 22 2012, 00:30
|- - greynol   QUOTE (Gainless @ Apr 21 2012, 15:59) I a...   Apr 22 2012, 04:07
- - lvqcl   There is no clipping distortion in an MP3 file. Cl...   Apr 22 2012, 00:38


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: 19th September 2014 - 09:44