(a) (b) (c) In a MPEG-2 system, the Group of Picture (GOP) is [ 11 P1...

   

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(a) (b) (c) In a MPEG-2 system, the Group of Picture (GOP) is [ 11 P1 P2 B1 B2 B3 P3 P4] (i) Define the reference frame for 11, P1, P2, B1, B2, and P3. (6 marks) During transmission, a random bit error happened in frame P3. List all frames in this GOP that are affected by the error. (3 marks) Both analog signal and digital signal are used during video processing and transmission. Compare the differences between analog and digital signals, and then list at least THREE (3) advantages of the digital signal over the analog signal. (6 marks) Tom prepares to fax a message "happy happ hap day" to Jerry. The message has a total of 18 characters. (i) Calculate the entropy of the message. (ii) (ii) (3 marks) Construct a Huffman tree to code the characters. Calculate the average number of bits per character. (7 marks) (a) (b) (c) In a MPEG-2 system, the Group of Picture (GOP) is [ 11 P1 P2 B1 B2 B3 P3 P4] (i) Define the reference frame for 11, P1, P2, B1, B2, and P3. (6 marks) During transmission, a random bit error happened in frame P3. List all frames in this GOP that are affected by the error. (3 marks) Both analog signal and digital signal are used during video processing and transmission. Compare the differences between analog and digital signals, and then list at least THREE (3) advantages of the digital signal over the analog signal. (6 marks) Tom prepares to fax a message "happy happ hap day" to Jerry. The message has a total of 18 characters. (i) Calculate the entropy of the message. (ii) (ii) (3 marks) Construct a Huffman tree to code the characters. Calculate the average number of bits per character. (7 marks)