Data Storage And Compression
Gbogbo ọrọ náà
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.
Ebumnobi
- 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
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Data Storage And Compression. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Data Storage And Compression? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
