The performance of the computer simulated 32 kbit/s LD-CELP coder was assessed by comparing it to the G.722 CCITT standard wideband coder at 64 kbit/s as shown in Table 3. The coding delay of the G.722 coder is 3 msec, whereas that of the LD-CELP is only 0.94 msec. The result of Table 3 also suggest that the MOS quality score of the 32 kbit/s audio coder is close to 4.0.
Table 3: Listening test results for proposed LD-CELP and the
CCITT-G.722 wideband coders