How does a higher picture resolution affect quality & file size?

Quality is improved as there is more detail, file size is larger

Metadata refers to information stored about an image.

What formula is used to calculate the file size of an image without knowing the DPI?

Width of pixels x Height of pixels x colour depth.

The number of bits used to encode each pixel and thus the number of available colours

How does a higher colour depth i.e. 16 bit instead of 4 bit effect quality & file size?

Quality is improved as there are more colours available per pixel but file size is larger

Vibrations travelling through air, water or metal.

The amplitude of a sound wave is...

How high the wave is from the crest or trough

Define what is meant by 'sampling'

Height of the wave is measured, at intervals and stored as binary.

The number of samples taken each second

The number of bits used per second of audio

Which three factors affect the quality of an audio clip?

Sample rate, bit rate and bit depth

How does sample rate affect the quality of an audio clip and file size?

The more bits that are sampled the better the accuracy of the file but also the greater the file size.

All the characters recognised/can be represented by a computer. Each character has a number.

Why was Unicode developed in 1991?

There was a need for a universal standard and more characters to cover all languages on earth.

What does Lossy Compression do to files?

Eliminates unnecessary information in a file to reduce file size

What is Lossless Compression?

There is no loss of information at all after compression

OCR GCSE Computer Science: Data Representation Flashcards

Student preview

49 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the smallest unit of data in computing?

Back

Bit

2.

FLASHCARD QUESTION

Front

How many bits are there in a byte?

Back

8

3.

FLASHCARD QUESTION

Front

What is a nibble equivalent to?

Back

4 bits

4.

FLASHCARD QUESTION

Front

What does binary data represent in computers?

Back

Analogue data

5.

FLASHCARD QUESTION

Front

What device converts analogue signals to digital data?

Back

Analogue-to-Digital Converter

6.

FLASHCARD QUESTION

Front

How many bytes are in 1 kilobyte?

Back

1000

7.

FLASHCARD QUESTION

Front

What is the binary system also known as?

Back

Base 2

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