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The evolution of encoding analog speech
waveforms into digital signals has resulted in a variety
of coder/decoder (or codec) algorithms implemented in
today’s telecommunication networks. G.711 is probably
the most common codec algorithm and standard, as this
is directly analogous with the 64 Kbps Pulse Code Modulation
(PCM) technology in traditional circuit-switched networks.
However, many additional codec formats are now available
intended to support equivalent audio quality and frequency
response across a voice network, while using lower bandwidth.
The process to convert digital signals from one codec
format to another is known as transcoding.
Transcoding is a fundamental feature of Convedia’s
Media Server family and has been supported since February
2001. Transcoding is usually invoked as an automatic background
task as required for audio conferencing (mixing participants
using different codecs), as well as for streaming announcements
encoded in one codec to endpoints using another codec.
Convedia’s transcoding features
include:
- Full transcoding between G.711
a-law, G.711 u-law, G.723.1, G.726, G.729a, G.729ab,
and AMR
- Automatic rate matching
In some applications, transcoding
becomes an important stand-alone media processing requirement
for scaleable VoIP networks. For example, Session Border
Controllers terminating RTP media streams encoded in different
codec formats can seamlessly request and control Convedia
media servers to provide adjunct transcoding of media
streams with incompatible encoding, providing a scalable,
carrier-class solution that encompasses both signaling
and media mediation.
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