Standard Audio Codecs

In this Section, we discuss the most used audio and speech codecs that can be used in real-time streaming. The list is not exhaustive as there are many working audio codecs, but we focus on the most popular, namely PCM, ADPCM, GSM, CELP, and LPC. The sampling rate distinguishes codecs used for speech from those used for audio (music) codecs. Speech (voice) codecs use in general 8000 sample per second. In most cases, it is sufficient to use mono channel. Whereas, in audio demanding high fidelity (like music), higher sampling rates are used (up to 44.1 KHz, for CD quality), and stereo channels are used some times.