9.1 Data Representation

What are the individual elements in the image called?

• Resolutions

• Pixels

• Sample frequency

• Images

There are 448 individual elements in this image. What is this number called?

• Pixels

• Images

• Pictures

• Resolution

This image allows two colours, therefore its colour depth is

• 0

• 1

• 2

• 11

• 10

The most common sampling rate for sound files is 44.1 khz.

• True
• False

A microphone converts the changes in air pressure into voltage changes which are then digitised.

• True
• False

The following is true about sampling rates:

• They measure a number of snapshots of sound taken per second.
• They are not as important as bit rates.
• They are different for every song, depending on its loudness.

Identify a false statement:

• Higher bit rates usually improve the sound quality and result in smaller file size.
• Higher bit rates usually improve the sound quality but result in larger file size.
• To record a sound into binary format, ADC will be applied rather than DAC.

Which of the following is not a usual way of reducing sound file size:

• Erasing metadata and keeping recordings short.
• Using lossy compression.
• Using lossless compression.
• Reducing sampling rate or bit rate.

A bitmap image is made up of

• Pixels
• Colours
• Sounds
• Samples
• Characters

The number of pixels per inch in an image is known as the

• Dimensions
• Colour depth
• Resolution
• Megapixels