PowerPoint Presentation

DIGITALISASIKonversi informasi dari kontinu ke diskrit

Typically from external energy source, usually in order to produce a specified response from the control system.Basic unit of information in computing and telecommunications

Two stable states of a flip-flop, two positions of an electrical switch, two distinct voltage or current levels allowed by a circuit, two distinct levels of light intensity, two directions of magnetization or polarization, etc

Numerical digits 0 and1BIT (Binary Digit)

Analog - Digital

16 x 16 grids = 169 pixels

2 bits (4 color)4 bits (16 color)8 bits (256 color)2 bits (2 color)

8 bits (256 color)16 bits (16,777,216 true color)

OrangeBlue

Numeric Representation

VGA (Video Graphics Adapter) Color CodeASCI Code

Units of SizeUnitAbbreviationSize (bytes)bitb1/8byteB1kilobyteKB210 = 1024megabyteMB220 = 1,048,576gigabyteGB230 = 1,073,741,824terabyteTB240 = 1,099,511,627,776petabytePB250 = 1,125,899,906,842,624 How do hard drive manufactures cheat you?15Units of TimeUnitAbbreviationDuration (seconds)secondsec/s1millisecondms10-3 = 1/1,000microsecondms10-6 = 1/1,000,000nanosecondns10-9 = 1/1,000,000,000picosecondps10-12 = 1/1,000,000,000,000femtosecondfs10-15 = 1/1,000,000,000,000,00016Units of FrequencyUnitAbbreviationCycles per secondhertzHz1kilohertzKHz103 = 1,000megahertzMHz106 = 1,000,000gigahertzGHz109 = 1,000,000,00017Picture ConversionPixels ( x grid )Brightness level / pixelColor level / pixelStorage capacityTotal storage bits = total pixel x bit of brightness x bit of color

Exp: black white picture with 256 x 256 pixel with 6 bits of brightness (64 brightness level)Ans: 256 x 256 x 6 = 393216 bits393216 / 8 = 49152 bytes49152 / 1024 = 48 kb

Color Code RGB SystemHas 3 different number (Red, Green and Blue)Has Intensity level of each color

Exp: - 3 bits of each color = 3 x 3 = 9 bits- 23 = 8 color intensity- 8 x 8 x 8 = 512 possible combinations

Video StorageColor TV with 512 x 512 pixels 3 bits/color/pixel = 9 bits/pixelScene change = 60 frames/second

512 x 512 x 9 x 60 x 3600 = 500 x 109 bits/hour

Titanic Movie (3 hours duration) = 191 GB