Unit 1 data compression

A single ASCII character, such as a the letter 'A', uses how much memory to represent a single character?

• 1 KiB

• 7 bits

• 7 bytes

• 1 bit

The letter 'A' in ASCII is represented using the code 65₁₀. Which code represents the letter 'G'?

• 68₁₀

• 69₁₀

• 70₁₀

• 71₁₀

The digit '0' is represented in ASCII by the code 48_10. How is the text '13' represented in ASCII?

• 00110001₂ 00110011₂

• 00110001₂ 00110001₂

• 00110001₂ 00110011₂

• 00100001₂ 00100001₂

An image has a resolution of 8 pixels in width, and 8 pixels in height. The color depth is 8 bits. How large is this image in bytes?

• 256 bytes

• 64 bytes

• 512 bytes

• 32 bytes

Audio is sampled at a rate of 10 Hz, and with a sampling resolution of 8 bits. If the resulting file size is 240 bits, what is the duration of the sampled audio?

• 3/8 seconds

• 10 seconds

• 19200 seconds

• 3 seconds

Run-Length Encoding (RLE) is a lossy compression algorithm.

• True
• False

When audio is sampled, the number of bits used to represent the amplitude of the audio signal is called the

• duration

• sampling resolution

• sampling rate

• pixel

Lossy compression will result in permanent loss of data.

• True
• False