Voip Codecs! What Are They?

Voip codecs also known as codec-decoder are used in voip technology to convert analog voice signal to digitally encoded version. It converts audio signal to compressed digital form to transmit and then uncompressed audio to receive it. Voip Codecs use are also referred to as vocoders, for “voice encoders”.There are two typles of codecs,Lossless codecs and Lossy codecs. Lossless codecs retain all the information contained in the original stream thus preserving the audio/video quality in a signal, while lossy codecs reduce the quality to achieve compression but also use lower data bandwidth. Voip codecs converts the sampling of audio signals several thousands time per second. There are three different sampling rates in voip codecs depending on each voip codecs.

• 64000 times per second
• 32000 times per second
• 8000 times per second

Voip Codecs user algorithms to sample, sort the audio data. CS-ACELP is widely used algorithm in voip technology.

The voip codecs works with algorithm to convert everything.

Each different software, phone, gateway supports several voip codecs. When communicating with each other, they will negotiate which codec they will use. Some codecs require payment for their use in a product or program. Each Voip codecs varies in call quality, bandwidth required and the computational requirements.

List of Voip Codecs

• AMR Codec
• BroadVoice Codec
• DoD CELP
• GIPS
• GSM
• iLBC
• ITU G.711
• ITU G.722
• ITU G.722.1
• ITU G.722.1C
• ITU G.722.2
• ITU G.722.2
• ITU G.723.1
• ITU G.726
• ITU G.726
• ITU G.728
• ITU G.728
• ITU G.729
• LPC10
• LPC10
• Speex

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Pete Zito