This Recommendation contains the description of an algorithm extending ITU-T G.711 for the
scalable coding of narrowband and wideband speech and audio signals from 64 to 96 kbit/s.
This Recommendation is organized as follows. The references, definitions, abbreviations and
acronyms, and conventions used throughout this Recommendation are defined in clauses 2, 3, 4,
and 5, respectively. Clause 6 gives a general outline of the G.711.1 algorithm. The G.711.1 encoder
and decoder principles are discussed in clauses 7 and 8, respectively. The transmitted parameters
are presented in clause 9. Clause 10 describes the software that defines this coder in 16-32 bit fixedpoint
arithmetic. In addition to the algorithm specified in the main body of this Recommendation,
appendix I provides a supplemental functionality enhancing the quality of the decoded signal when
a legacy G.711 or only the basic log companded PCM part is available.