Data Storage And Compression
Akopọ
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.
Awọn Afojusun
- 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
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Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
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Oriire fun ipari ẹkọ lori Data Storage And Compression. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Data Storage And Compression? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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