Representing Data

Match the following keywords with their definitions.

​ (a)   the colour depth of an image will ​ (b)   the accuracy of the image and increase its ​ (c)   .​

An image uses a colour depth of 3-bit.

How many colours could be represented in the image?

Fill in the blank below:

An image is 100 pixels wide by 400 pixels high and uses a colour depth of 4 bit.

The estimated file size for this image would be (a)   KB.

Audio is recorded by digitising ​ (a)   sounds. To do this measurements of the sound wave's ​ (b)   , called ​ (c)   , are take at set intervals. This interval is dictated by the ​ (d)   . Each of these samples is stored as binary. The number of bits used for each sample is known as the ​ (e)   .

Which of these statements are true about increasing the sampling rate when recording audio?

A brief interview is recorded as part of a podcast. The interview is 10 seconds long. It is recording on one channel using a sample rate of 10KHz and a bit depth of 8-bit.

The estimated file size for this file would be (a)   KB.

A ​ (a)   is a list of all the ​ (b)   available for a computer to use each with a unique ​ (c)   value associated with it.

Organise these options into the character set they describe.