Data Storage And Compression
Muhtasari
A phone with 128 gibibytes of storage fills up faster than the number on the box suggests, and a photo saved as a JPEG is a fraction of the size of the same photo saved as a bitmap. Neither of these is a coincidence. They come from two ideas that sit behind almost everything a computer stores: the units used to measure data, and the algorithms used to shrink it.
In this lesson you will learn how to convert between binary and denary multiples of a byte, why files are compressed and the difference between doing so losslessly and lossily, how the run-length encoding algorithm compresses repetitive data, and how to calculate the storage a file will need before it is saved.
Malengo
- Understand how to use and convert between binary and denary multiples (bit, nibble, byte, kibibyte, mebibyte, gibibyte, tebibyte, kilobyte, megabyte, gigabyte, terabyte)
- Understand the need for data compression and methods of compressing data (lossless, lossy), and that JPEG and MP3 are examples of lossy algorithms
- Understand how a lossless, run-length encoding (RLE) algorithm works
- Understand that file storage is measured in bytes and be able to calculate file sizes
Ramani ya mawazo
Mada hii imechorwa ili uone jinsi mawazo yanavyounganika.
Fungua ramani ya mawazo kwenye programu
Kadi za kumbukumbu
Mazoezi ya haraka ya kumbukumbu kuhusu kinachopimwa katika mada hii.
Fanya mazoezi ya kadi hizi kwenye programu
Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Data Storage And Compression. 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.
- How many bits are there in 1 nibble? A) 2 B) 4 C) 8 D) 16 Answer: B
- Which of these is the correct value of 1 mebibyte? A) 1,000,000 bytes B) 1,024 bytes C) 1,048,576 bytes D) 1,000 bytes Answer: C
- Which compression method discards data that cannot be recovered? A) Lossless B) Lossy C) Run-length encoding D) Archiving Answer: B
- A string contains the run WWWWWBBB (5 Ws then 3 Bs). What is the run-length encoded output? A) WWWWWBBB B) 5W3B C) W5B3 D) 8WB Answer: B
- Which file format is named by the Edexcel specification as an example of lossy compression? A) ZIP B) PNG C) JPEG D) TXT Answer: C
Fanyia kazi maswali haya kwenye programu
Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Data Storage And Compression? 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.
