IPB

Welcome Guest ( Log In | Register )

IMA ADPCM encoding
Megaman
post Oct 21 2005, 04:52
Post #1





Group: Members
Posts: 148
Joined: 27-October 02
From: Buenos Aires
Member No.: 3626



Hi, I recently acquired a cheap chinese MP3 Player with voice recording/encoding capability.

The max voice quality you can get from this is "IMA ADPCM 16bit 32kbps mono".

I downloaded some voice encodings from the player and opened them with Adobe Audition, edited useless parts and saved as the same format.

There is supposedly a re-encoding process going on, but I can´t notice any quality degradation. I really don´t want to save to plain PCM because, correct me if I´m wrong, the files would be 4 times bigger (I already tried with approximately 4x size increase).

What would you do to preserve as much quality as possible without increasing the size (I mean keeping it around the same bitrate)?

Thanks.

Edit: it was actually 32kbps

This post has been edited by Megaman: Oct 23 2005, 01:40


--------------------
No se porqué
imaginé
que estabamos unidos
y me sentí mejor
pero aquí estoy
tan solo en la vida
que mejor me voy
Go to the top of the page
+Quote Post
 
Start new topic
Replies
kjoonlee
post Oct 31 2005, 14:26
Post #2





Group: Members
Posts: 2526
Joined: 25-July 02
From: South Korea
Member No.: 2782



If you crop a .jpeg file, you'll have to recompress. You'll lose quality. On the other hand, if you crop a 255 colour .gif file, you still have to recompress, but you won't lose quality.

ADPCM is a bit like .gif; quantization will be lossy but the storage is lossless.


--------------------
http://blacksun.ivyro.net/vorbis/vorbisfaq.htm
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: 24th September 2014 - 06:08