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VoIP Codecs

VoIP Codecs  
Codecs are used to change analog data into digitally encoded files that can be sent through the internet before eventually being decoded back into its original format that the recipient can then see/hear. Each codec uses it's own unique technique to convert the data, and as a result, codecs used for VoIP will vary according to the quality of sound preserved, the amount of bandwidth required to send the files, and the number of resources required in order to make the conversion.

The following is a chart of some of the codecs currently available for VoIP encoding:

- Codec Chart -

Codec

Algorithm

Bit Rate (Kbps)

GIPS Family

13.3+

GSM-Half Rate

CELP-VSELP

11.4

GSM-Full Rate

RPE-LTP

13

GSM-Enhanced Rate

ACELP

12.2

ILBC

Internet Low Bitrate Codec

13.33 & 15.20

ITU G.711

PCM

64

ITU G.722

SBADPCM

48, 56, & 64

ITU G.723

Multi-rate Coder

5.3 & 6.4

ITU G.726

ADPCM

16, 24, 32, & 40

ITU G.728

LD-CELP

16

Speex

CELP

2.15-44.2

LPC10

2.5

DoD FS-1016

CELP

4.8




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