Data Storage And Compression
Muhtasari
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.
Malengo
- 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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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 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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