[M4IF Technotes] What does AMR stand for? / Where's CELP

[Ralph Neff]

Ben,
AMR is Adaptive Multi-Rate speech codec.
Regarding CELP, my interpretation is that low
bitrate speech codecs are most useful in the mobile
space, due to the low bandwidth and the fact that
2-way speech communication is a core application.
But MPEG-4 CELP isn't specified by any of the mobile 
standards (e.g. 3GPP, 3GPP2).
Sure it's in ISMA, but the target application for
ISMA (one-way multimedia delivery, wide range of content,
transport via internet) makes generic audio coding
(AAC) much more interesting/useful than speech coding.
-Ralph
-----Original Message-----
From: Ben Waggoner [mailto:ben   interframemedia.com]
Sent: Thursday, March 13, 2024 2:36 PM
To: Technotes   lists.m4if.org
Subject: [M4IF Technotes] What does AMR stand for? / Where's CELP
Folks,
    I know I should know this, but don't seem to.  What does the AMR acronym
actually stand for?
    Also, anyone have a good story for why CELP audio implementations are so
rare, even though the codec is part of ISMA?
Ben Waggoner <http://www.benwaggoner.com>
Compressed Video Consulting, Training, and Encoding
My Book:            <http://www.benwaggoner.com/books.htm>
Cleaner e-book:     <http://www.cmpbooks.com/cleaner>
Compression Classes at Stanford  June 30-July 4 and Aug 11-15
<http://www.digitalmediaacademy.org/compression.html>
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