The iLBC codec operates at 38 bytes per sample per 20-millisecond interval. What is its codec bit
rate in kilobits per second?
A.
6.3
B.
13.3
C.
15.2
D.
16
E.
24
Explanation:
Explanation; The internet Low Bit Rate Codec (iLBC) is designed for narrow band
speech and results in a payload bit rate of 13.33 kbits per second for 30-millisecond (ms) frames
and 15.20 kbits per second for 20 ms frames. When the codec operates at block lengths of 20 ms,
it produces 304 bits per block, which is packetized as defined in RFC 3952. Similarly, for block
lengths of 30 ms it produces 400 bits per block, which is packetized as defined in RFC 3952.The
iLBC has built-in error correction functionality to provide better performance in networks with
higher packet loss