Howtosignalprocessing
Common VoIP Codecs
| Codec | Bandwidth/kbps |
|---|---|
| G.723.1 | 5.3/6.3 |
| G.726 | 16/24/32/40 |
| G.729 | 8 |
| GSM | 13 |
Why are codecs used in VoIP?
VoIP codecs are used to compress the data sent during those calls, allowing for lower latency and higher audio quality. Codec comes from the words Compression and Decompression. A codec is an algorithm that is used to compress audio and/or video, allowing high-quality media content to be transmitted over the internet.
What is better G711 and G729?
The most efficient is G729, followed by G711 and then G722 and the other wideband codecs. Each codec is listed at G729 (8 kbps), G 711 (64kbps) and G722 (48, 56 & 64 kbps) with network overhead for UDP and ethernet the real rates per call are approx. G729 (26kbps), G711 (82 kbps) & G722 etc. (50-80 kbps).
What is codec and DSP in VoIP?
One common application for CODECs is with Digital Signal Processors (DSPs) in audio electronics devices. CODECs convert sound (using the ADC) to digital signals for a processor to compress and store and for playback, the stored digital data is decompressed and converted to analog signals via the DAC.
