LS - Computer Systems - HE.9.4

A ​ (a)   is an early sample of a product that allows the user to view or test what the product will be like when it is completed.

• prototype
• new product

Clients often provide product designers with ​ (a)   to help them make improvements to a product or a product’s design.

• ergonomics
• feedback

When designing a new product, developers must consider how well the product can be used by all users. This is known as product ​ (a)  

• feedback
• accessibility

(a)   relates to how a product is designed for efficient use.

• Feedback
• Ergonomics

Designing a simple interface with limited options in a new application for very young users shows that the developer has taken ​ (a)   into consideration.

• ergonomics
• user experience

Designing an application for users with a visual impairment, which uses large buttons with simple graphics to explain what task each button carries out, shows that the designer has taken ​ (a)   into consideration.

• ergonomics
• accessibility

Place each task in the correct column to show whether it is carried out by the operating system or by a utility program.

Groups:

(a) Operating system

,

(b) Utility program

• Manages the processor

• Reduces the size of files stored on a digital device

• Manages all of the hardware in the device

• Can prevent software from recording users’ key strokes on a digital device

• Helps to reduce the chance of viruses entering a digital device

• Retrieves files

• Provides an interface for users to interact with the device

• Allows users to back up data stored on a digital device

• Runs applications

• Reorganises the content of a hard disc drive to make file storage and retrieval quicker

The image shows a sound wave, sampled over a period of 1 second.

Complete the sentence below to explain how sound is digitised:

Sound creates a wave that can be described as being ​ (a)   in format. For a sound wave to be understood by a computer, it must be converted into ​ (b)   format.

• analogue
• simple
• digital

The image shows a sound wave, sampled over a period of 1 second.

Complete the sentence below to explain how sound is digitised:

Devices called ​ (a)   are used to convert sound waves into a format that a computer can understand.

• CAD
• DAC
• ADC

The image shows a sound wave, sampled over a period of 1 second.

Complete the sentence below to explain how sound is digitised:

Recording part of a sound wave at fixed intervals in time is known as ​ (a)   . Sound at a given moment in time is measured using ​ (b)   .

• hertz
• bit depth
• sampling