Data Storage And Compression
Gbogbo ọrọ náà
Every photo you take, every song you stream and every video you upload is, underneath, a long string of bits that has to be measured, stored and moved around. Knowing how to work out the exact size of an image or a sound file, and how compression shrinks that file without ruining it, turns a vague sense of 'big file, slow upload' into a precise, examinable skill.
In this lesson you will measure data in bits, bytes and the binary multiples up to the tebibyte, then calculate the size of an image file and a sound file from first principles. After that you will see exactly why files need compressing and how lossy and lossless methods, including run length encoding, achieve the saving.
Ebumnobi
- 1 Understand how data storage is measured
- 2 Calculate the file size of an image file and a sound file, using information given
- 3 Understand the purpose of and need for data compression
- 4 Understand how files are compressed using lossy and lossless compression methods
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
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 a byte? A. 2 B. 4 C. 8 D. 16 Answer: C
- An image is 200 x 100 pixels with a colour depth of 8 bits. Its size in bits is: A. 20 000 B. 160 000 C. 2 000 000 D. 1 600 Answer: B
- How many bytes are there in 1 kibibyte (KiB)? A. 8 B. 100 C. 1000 D. 1024 Answer: D
- Which statement about lossy compression is correct? A. It removes data permanently B. The original can always be rebuilt exactly C. It is ideal for text files D. It never reduces image quality Answer: A
- Run length encoding is best described as: A. a lossy method that deletes colours B. a lossless method that stores runs of repeating data as a value and a count C. a method only used on sound files D. a way of increasing file size Answer: B
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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