ETS 300 726 : 20002

Foreword
1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
   3.1 Definitions
   3.2 Symbols
   3.3 Abbreviations
4 Outline description
   4.1 Functional description of audio parts
   4.2 Preparation of speech samples
   4.3 Principles of the GSM enhanced full rate
       speech encoder
   4.4 Principles of the GSM enhanced full rate
       speech decoder
   4.5 Sequence and subjective importance of encoded
       parameters
5 Functional description of the encoder
   5.1 Pre-processing
   5.2 Linear prediction analysis and quantization
   5.3 Open-loop pitch analysis
   5.4 Impulse response computation
   5.5 Target signal computation
   5.6 Adaptive codebook search
   5.7 Algebraic codebook structure and search
   5.8 Quantization of the fixed codebook gain
   5.9 Memory update
6 Functional description of the decoder
   6.1 Decoding and speech synthesis
   6.2 Post-processing
7 Variables, constants and tables in the C-code
   of the GSM EFR codec
   7.1 Description of the constants and variables
       used in the C code
8 Homing sequences
   8.1 Functional description
   8.2 Definitions
   8.3 Encoder homing
   8.4 Decoder homing
   8.5 Encoder home state
   8.6 Decoder home state
9 Bibliography
Annex A (informative): Document change history
History

Specifies the detailed mapping between input blocks of 160 speech samples in 13-bit uniform PCM format to encoded blocks of 244 bits and from encoded blocks of 244 bits to output blocks of 160 reconstructed speech samples.