Difference between revisions of "Codecs"
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| speex(24.6 Kbps)||66 Bytes || 20ms || 56 bytes || 25ms || 42.4 Kbps | | speex(24.6 Kbps)||66 Bytes || 20ms || 56 bytes || 25ms || 42.4 Kbps | ||
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| speex(18.2 Kbps)||46 Bytes || 20ms || 56 bytes || 20ms || 42.4 Kbps | |||
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* A more detailed guide about bandwidth calculations ant related [http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml metrics] | * A more detailed guide about bandwidth calculations ant related [http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml metrics] | ||
* Also [http://www.voip-info.org/wiki/view/Codecs here] | * Also [http://www.voip-info.org/wiki/view/Codecs here] | ||
* A simple bandwidth calculator can be found [http://www.asteriskguide.com/bandcalc/bandcalc.php here] | |||
* [[Speex codec install]] | |||
<br><br> | <br><br> | ||
Revision as of 15:13, 24 November 2011
Description
Codecs are used to convert an analog voice signal to digitally encoded version. Codecs vary in the sound quality, the bandwidth required, the computational requirements, etc
Per Call Bandwidth requirements for various codecs
| Codec & Bit Rate (Kbps) | Codec Sample Size (Bytes) | Codec Sample Interval (ms) | Voice Payload Size (Bytes) | Voice Payload Size (ms) | Bandwidth Ethernet (Kbps) |
| G.711 (64 Kbps) | 80 Bytes | 10ms | 160 bytes | 20ms | 87.2Kbps |
| G.729 (8 Kbps) | 10 Bytes | 10ms | 20 bytes | 20ms | 31.2Kbps |
| G.723.1 (6.3 Kbps) | 24 Bytes | 30ms | 24 bytes | 30ms | 21.9Kbps |
| G.723.1 (5.3 Kbps) | 20 Bytes | 30ms | 20 bytes | 30ms | 20.8Kbps |
| G.726 (32 Kbps) | 20 Bytes | 5ms | 80 bytes | 20ms | 55.2Kbps |
| G.726 (24 Kbps) | 15 Bytes | 5ms | 60 bytes | 20ms | 47.2Kbps |
| G.728 (16 Kbps) | 10 Bytes | 5ms | 60 bytes | 30ms | 31.5Kbps |
| G722_64k(64 Kbps) | 80 Bytes | 10ms | 160 bytes | 20ms | 87.2Kbps |
| ilbc_mode_20(15.2Kbps) | 38 Bytes | 20ms | 38 bytes | 20ms | 38.4Kbps |
| ilbc_mode_30(13.33Kbps) | 50 Bytes | 30ms | 50 bytes | 30ms | 28.8Kbps |
| speex(24.6 Kbps) | 66 Bytes | 20ms | 56 bytes | 25ms | 42.4 Kbps |
| speex(18.2 Kbps) | 46 Bytes | 20ms | 56 bytes | 20ms | 42.4 Kbps |
For more information please visit
- A more detailed guide about bandwidth calculations ant related metrics
- Also here
- A simple bandwidth calculator can be found here
- Speex codec install
