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midterm_key1

# midterm_key1 - remains constant during the entire lifetime...

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Problem 1 (a) MIDI: (5pt) Musical Instrument Digital Interface represents a set of specification used in instrument development so that instruments from different manufacturers can easily exchange musical information . The MIDI protocol is an entire music description language in binary form . Please refer to section 3.4.1 on page 31 for complete information. . (b) RGB : (5pt) The RGB color model is an additive color model in which red, green, and blue light is added together in various ways to reproduce a broad array of colors. The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. Before the electronic age, the RGB color model already had a solid theory behind it, based in human perception of colors. (b) Strongly regular data stream : (5pt) If the quantity of data

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Unformatted text preview: remains constant during the entire lifetime of a data stream, then it is a strongly regular data stream. This characteristic is typical for an uncompressed digital audio-video stream. Problem 2 Huffman Code: A: 0001 B: 01 C: 1 D: 001 E: 0000 You can get different answers if you swap the order of the node’s childrens. 1 1 1 p(B)=0 .29 p(A)=0 .11 p(ADE)= 0.32 p(A,B,C,D, E)=1 P(ABDE)=0 .61 p(C)=0 .39 p(A,E)=0 .19 p(D)=0. 1333 p(E)=0 .08 1 But the shape of the tree should be the same. Problem 3 The JEPG decompression consists of the following steps. (You need to explain what is exactly done in each step. See the textbook for details. ) (1) Entropy decoding. (5pt) (2) Dequantization. (5pt) (3) Inverse discrete consine transform. (5pt) Problem 4 P-frames B-frames D-frames You should give the details of those frames and prove it give more compression ratio. And any other reasonable reasons...
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