情報量・音声画像動画のA/D変換
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- れいな すえがら
- 9 years ago
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1 L06( Wed), A/D ( ) L06 A/D (2014) 1 / 24
2 : L05-S1 Quiz :int x , 16 0 x L05-S5 Quiz : 2 17 < , = 1024, 2 16 = log 10 2, log ( ) L06 A/D (2014) 2 / 24
3 1 : 2 A/D ( ) L06 A/D (2014) 3 / 24
4 n : } {{ } n =bit, b,. =, 1 bit n bit 2 n 1. log 2 W bit W 1. n, n bit. W, L, = L log 2 W. 2 L log 2 W. : W L = 2 L log 2 W. ( ) L06 A/D (2014) 4 / 24
5 bit Byte 8bit=1Byte. =Byte=B. 1MB=10 6 Byte T tera 10 9 G giga 10 6 M mega 10 3 k(k) kilo m milli 10 6 µ micro 10 9 n nano 2 40 = Ti tebi 2 30 = Gi gibi 2 20 = Mi mebi 2 10 = 1024 Ki kibi 2 0 gibi=giga binary , Gi G, Mi M, Ki k. iphone 32GB bit. ( ) L06 A/D (2014) 5 / 24
6 ( ),.,. 2. 1: L 1 = L 1 log 2 W L 2 = L 2 log 2 W L 1 + L 2 = (L 1 + L 2 ) log 2 W. 2: , (, ) W 1 = 4 = 1 log 2 4 bit W 2 = 16 1 log 2 16 bit log 2 (4 16) bit. ( ) L06 A/D (2014) 6 / 24
7 L06-Q1 Quiz( ) 16GB USB,., , 1 300, ( ) L06 A/D (2014) 7 / 24
8 1 : 2 A/D ( ) L06 A/D (2014) 8 / 24
9 ,. :,,,. :,, CD,.. A/D, D/A. A/D A/D D/A ( ) ( ) L06 A/D (2014) 9 / 24
10 L06-Q2 Quiz( ) ( )? ( ) L06 A/D (2014) 10 / 24
11 L06-Q3 A/D, D/A PC, A/D? D/A? ( ) L06 A/D (2014) 11 / 24
12 1 : 2 A/D ( ) L06 A/D (2014) 12 / 24
13 sampling (t, (x, y)) ( ) L quantization (z) W encoding W L ( ) L06 A/D (2014) 13 / 24
14 A/D ( ) z = f(t). :. t:. z. t. L f(t 1 ), f(t 2 ),..., f(t L ). z, W. W L. L log 2 W bit. ( ) L06 A/D (2014) 14 / 24
15 A/D t = 2, z = 5, W = 4 ( ) L06 A/D (2014) 15 / 24
16 L06-Q4 A/D t = 1, z = 2.5, W = 8. ( ) L06 A/D (2014) 16 / 24
17 ( ) L06 A/D (2014) 17 / 24
18 L06-Q5 Quiz( ) CD, ( 2 ), , = Byte? 1 480bit 2 480Byte 3 480KByte 4 480MByte 5 480GByte ( ) L06 A/D (2014) 18 / 24
19 ( ) A/D xy z. z = f(x, y). x, y f(x 1,y N2 ) f(x N1,y N2 ).. f(x 1,y 1 ) f(x N1,y 1 ) z = f(x, y) W. W = 2 =, 16, 256,.... W L = N 1 N 2. N 1 N 2 log 2 W bit.,,., 3 RGB. 3. ( ) L06 A/D (2014) 19 / 24
20 L06-Q6 Quiz( ) , , 1 16, b 2 640B 3 640kB 4 640MB 5 640GB ( ) L06 A/D (2014) 20 / 24
21 A/D., N 3 N 1 N 2 W A/D,. bit. ( ) L06 A/D (2014) 21 / 24
22 Quiz, A/D MByte????? ( ) L06 A/D (2014) 22 / 24
23 1-503, Quiz RaMMoodle :,,, 0. RaMMoodle 23:59. 6(1-539), (7-002/1-502) (1-614) ( ) L06 A/D (2014) 23 / 24
24 ! , 90, 30,..., Quiz,. ( , ) (L01) (L05). (L02)., (L03). 2 (L04). (L04). (L05) (1 ), (2 ) (L06).?(L07) ( ) L06 A/D (2014) 24 / 24
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