Data Representation

These flashcards cover key concepts from the lecture on data representation, including binary systems, data units, compression methods, and encoding systems.

What number system do digital devices typically use for counting?

Binary system.

What is the most basic unit of data in digital devices?

Bit (represented as '0' or '1').

How many bits are in one byte?

8 bits.

What is the value of 1 Megabyte (MB) in Bytes?

1 MB = 1024 KB = 1024 × 1024 Bytes.

What does the term bitrate refer to?

The amount of data transferred per unit time.

How is a binary number represented?

Using only the digits '0' and '1'.

In binary to decimal conversion, what does the binary number 11012 equal in decimal?

13 in decimal.

How do you convert a decimal number to binary?

By repeatedly dividing the number by 2 and recording the remainders.

What are the two types of integers in digital representation?

Unsigned integers and signed integers.

What is the two’s complement representation?

A method for representing signed integers that can include negative values.

What is the range of a 4-bit two’s complement representation?

From -8 to 7.

What is the ASCII code used for?

To represent characters in the English language with a 7-bit binary number.

What is lossless compression?

Compression in which no data is lost and the original data can be perfectly reconstructed.

What is the frame rate of a video measured in?

Frames per second (fps).

What does the colour depth of an image represent?

The number of bits used to represent the color of a pixel.

What type of image format is BMP?

Bitmap format, typically uncompressed.

What is a QR code?

A two-dimensional barcode that represents a text string, usually a URL.

What happens when an overflow error occurs in digital representation?

The result of a calculation exceeds the maximum value that can be represented.

What is the main purpose of digitalisation?

To convert analog data into digital data.

What is the significance of sampling rate in audio files?

The number of audio samples taken per second.

What is a common format for compressed audio files?

MP3.