G.728 is an ITU-T ADPCM speech codec standard covering the transmission of voice at rates of 16, 24, 32, and 40 kbit/s. It was introduced to supersede both G.721, which covered ADPCM at 32 kbit/s, and G.723, which described ADPCM for 24 and 40 kbit/s. G.726 also introduced a new 16 kbit/s rate. The four bit rates associated with G.726 are often referred to by the bit size of a sample, which are 2-bits, 3-bits, 4-bits, and 5-bits respectively.

G728(LD-CELP)
.............\api
.............\...\adapters.c
.............\...\consealg728.c
.............\...\g728api.c
.............\...\g728tables.c
.............\...\g728tables.h
.............\...\owng728.c
.............\...\owng728.h
.............\...\pitchg728.c
.............\...\pstg728.c
.............\...\scratchmem.h
.............\...\vq.c
.............\include
.............\.......\g728.h
.............\.......\g728api.h
.............\Makefile
.............\samples
.............\.......\Debug
.............\.......\g728decoder.c
.............\.......\g728decoder.h
.............\.......\g728encoder.c
.............\.......\g728encoder.dsp
.............\.......\g728encoder.dsw
.............\.......\g728encoder.h
.............\.......\g728encoder.ncb
.............\.......\g728encoder.opt
.............\.......\g728encoder.plg

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