Computer Science - 0478 CIE

Text, Sound And Images

Gbogbo ọrọ náà

Everything a computer stores, every essay, song and photograph, is held as nothing but ones and zeros. So how does a string of bits become the letter A, a drum beat, or a sunset? The answer is a set of clever, fixed rules for turning each kind of media into binary, and back again.

In this lesson you will see exactly how character sets like ASCII and Unicode encode text, how sampling captures sound, and how a grid of pixels stores an image. You will also learn the two dials, sample rate and resolution for sound, resolution and colour depth for images, that trade quality against file size, and you will calculate those file sizes yourself.

Ebumnobi

  1. 1 Understand how and why a computer represents text and the use of character sets, including American standard code for information interchange (ASCII) and Unicode
  2. 2 Understand how and why a computer represents sound, including the effects of the sample rate and sample resolution
  3. 3 Understand how and why a computer represents an image, including the effects of the resolution and colour depth

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

A computer can only store and process binary, so before any text, sound or image can be saved, it must be turned into a pattern of bits. Understanding the rules behind that conversion lets you explain why a high quality photo is a large file, why a sound clip recorded at a higher rate sounds better, and why ASCII cannot cope with every world language. These ideas appear in almost every Data representation question.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Text, Sound And Images. 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.

  1. How many different characters can a 7-bit ASCII code represent? A. 7 B. 64 C. 128 D. 256 Answer: C
  2. Which change increases the quality of a sound recording? A. lowering the sample rate B. increasing the sample resolution C. reducing the colour depth D. removing metadata Answer: B
  3. An image is 200 by 100 pixels with a colour depth of 8 bits. Its size in bits is: A. 2000 B. 20000 C. 160000 D. 1280000 Answer: C
  4. Why was Unicode created? A. to make files smaller B. to represent characters from many world languages C. to replace binary D. to remove the need for a character set Answer: B
  5. What does the colour depth of an image describe? A. the number of pixels in the image B. the width of the image C. the number of bits used per pixel D. the file format Answer: C

Rue ajuju ndi a n'ime ngwa ahu

Rue ajuju ndi a n'ime ngwa ahu

Akwụkwọ A Na-atụ Aro

Cambridge IGCSE and O Level Computer Science Coursebook
Cambridge IGCSE and O Level Computer Science Coursebook
Ìkọ̀wé-àbáojú: Second edition
Onye Mbipụta: Cambridge University Press
Afọ: 2021
ISBN: 978-1-108-91514-4
Akọkọ ọrọ.: Endorsed coursebook with full coverage of the 0478/0984 syllabus, worked tasks and exam-style questions.
Cambridge IGCSE and O Level Computer Science
Cambridge IGCSE and O Level Computer Science
Ìkọ̀wé-àbáojú: Second edition
Onye Mbipụta: Hodder Education
Afọ: 2021
ISBN: 978-1-3983-1828-1
Akọkọ ọrọ.: Endorsed textbook covering the theory and the algorithms, programming and logic content.

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Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Text, Sound And Images? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.

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