Data Representation
Muhtasari
A photograph, a song and a paragraph of text look nothing alike, yet a computer stores all three the same way: as binary digits. The difference is entirely in how those digits are agreed to be interpreted, letter by letter for text, pixel by pixel for an image, sample by sample for sound.
In this lesson you will learn how characters are encoded using ASCII and Unicode, how a bitmap image's resolution and colour depth determine its uncompressed file size, how an analogue sound wave is converted into binary using sampling, and why the number of bits available always limits how faithful any of these digital representations can be.
Malengo
- Understand how computers encode characters using ASCII and Unicode
- Understand how bitmap images are represented in binary (pixels, resolution, colour depth)
- Understand how sound, an analogue signal, is represented in binary
- Understand the limitations of binary representation of data (sampling frequency, resolution) when constructed by the number of available bits
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Data Representation. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- The upper-case letter 'A' has the ASCII code 65. What is the ASCII code of the lower-case letter 'a'? A) 33 B) 66 C) 97 D) 129 Answer: C
- An image is 100 pixels wide, 50 pixels tall, and uses a colour depth of 8 bits. What is its uncompressed file size in bits? A) 4 000 B) 8 000 C) 40 000 D) 400 000 Answer: C
- Which setting controls how many amplitude levels a single digital audio sample can be stored as? A) Sample rate B) Bit depth C) Number of channels D) File format Answer: B
- A recording is made with too low a sample rate. What is the most likely effect on the digital recording? A) The file becomes larger than expected B) Rapid changes in the original sound are missed C) The recording gains extra colour depth D) The recording becomes louder Answer: B
- What is the main reason Unicode was developed alongside ASCII? A) To make text files smaller B) To represent far more characters than ASCII can, covering the world's writing systems and symbols C) To replace binary with a new number system D) To increase a computer's sample rate Answer: B
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Data Representation? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
