G.723.1 BIT ALLOCATION 6.3kbit/s CODER

TABLE 5

Bit allocation of the 6.3 kbit/s coding algorithm

Parameters coded

Subframe 0

Subframe 1

Subframe 2

Subframe 3

Total

LPC indices

        

24

Adaptive codebook lags

7

2

7

2

18

All the gains combined

12

12

12

12

48

Pulse positions

20

18

20

18

73

Pulse signs

6

5

6

5

22

Grid index

1

1

1

1

4

Total

189

Ref. [3],Table 2

The number of code words in the fixed codebook is not a power of 2, therefore 3 additional bits
are saved by combining the 4 MSB of each pulse position index into a single 13-bit word.


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