Q3. Fig. Q3(a) shows the transport packet header in a digital TV broadcast system. Transpont Packet header 13-bit PID +4-bit continuity counter (CC) 2-bit adaptation field control PacketPacket synchronization 2-bit conditional access Priority (optional) Fig. Q3(a) (a) Describe the uses of (i) 13-bit packet identification (PID); (ii) 4-bit continuity counter (CC); and (iii) 2-bit conditional access. (6 marks) (b) Fig. Q3(b) shows one audio bitstream, and two video bitstreams that make up an MPEG-2 transport stream. Fill in possible values of PID and CC. Give your answer on the answer sheet atlached in the Appendix of this examination paper.) Packet 1 23 4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 PID Fig. Q3(b) (5 marks) (c) In digital TV broadcast, the packets of a transport stream are decoded in a channel. After decoding, various tables are formed by the packets with different PIDs, and they are listed as follows: Table formed by ackets with PID=0 Table formed by packetsTable formed by with PID- ackets with PID 15 PID 26 27 28 PID 15 PID Video Audio-1 Audio-2 PCR ECM EMM-program H 54 EMM- Program H 13 Table formed by ackets with PID 18 Table formed by ackets with PID-13 PID 32 Video Data ECM PCR Audio-1 Video PCR 42 19 Q3. Fig. Q3(a) shows the transport packet header in a digital TV broadcast system. Transpont Packet header 13-bit PID +4-bit continuity counter (CC) 2-bit adaptation field control PacketPacket synchronization 2-bit conditional access Priority (optional) Fig. Q3(a) (a) Describe the uses of (i) 13-bit packet identification (PID); (ii) 4-bit continuity counter (CC); and (iii) 2-bit conditional access. (6 marks) (b) Fig. Q3(b) shows one audio bitstream, and two video bitstreams that make up an MPEG-2 transport stream. Fill in possible values of PID and CC. Give your answer on the answer sheet atlached in the Appendix of this examination paper.) Packet 1 23 4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 PID Fig. Q3(b) (5 marks) (c) In digital TV broadcast, the packets of a transport stream are decoded in a channel. After decoding, various tables are formed by the packets with different PIDs, and they are listed as follows: Table formed by ackets with PID=0 Table formed by packetsTable formed by with PID- ackets with PID 15 PID 26 27 28 PID 15 PID Video Audio-1 Audio-2 PCR ECM EMM-program H 54 EMM- Program H 13 Table formed by ackets with PID 18 Table formed by ackets with PID-13 PID 32 Video Data ECM PCR Audio-1 Video PCR 42 19