August 1999
Intermediate to advanced
328 pages
8h 50m
English
Content preview from Voice Over IP
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Chapter 4. Voice Coders
This chapter provides an overview of the prevalent coders/decoders (codecs) used in VoIP. They are also known as codecs, speech, coders, voice coders, or simply coders. There is a wealth of information on this subject, and it is not my intent to rehash these sources. Some recommendations for reading are [MINO98],[1] any of John Bellamy's books, and the BT Technology Journal. Several of BT's issues in the past two years have focused on voice coders, and the ITU-T specifications.
[1] [MINO98] Minoli, Daniel. Delivering Voice over IP Networks, John Wiley & Sons, 1998.
The approach in this chapter is to provide a brief tutorial on the major coder functions, provide a brief classification of coders, and then explain three coders ...