This course looks at different types of voice coder used in GSM and UMTS networks and then investigates its basic operation looking at CELP and VSELP.
The course progresses to look at the functionality of the AMR voice codec and suggest its benefits and looks at Source Controlled Rate (SCR) operation finishes by looking at lost frame substitution.
Voice Coding
Linear Predictive Coders (LPCs)
The GSM Vocoder
Vocoder Action
RPE
Vocoder Output
GSM Coder and Decoder
Subjective Division of Codec Parameters
Categorization
The GSM Half-Rate Speech Coder
Code Excited Linear Predictor (CELP)
GSM Enhanced Full Rate Speech Coder
Adaptive Multi-Rate (AMR) Voice Codec
General Description
Source Controlled Rate (SCR) Operation
Lost Frame Substitution
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