Chapter 1 : Binary numbers Flashcards
Digital data. Reading binary numbers. Adding in binary. Decimal to binary. Digital text and numbers. Sound and vision.
What are the four rules of binary addition?
0+0 =0, 1+0=1, 1+1=10, 1+1+1=11
What is base 2?
Base 2 is another name for the binary system. It uses 2 digits (0 and 1), each column holds a value two times greater than the previous column.
What is the largest decimal number than can be shown in bits?
255
Why is ASCII limited to 256 characters?
It is because ASCII was made for the English language and in the English language, there are only 256 characters.
How are pixels used to make digital images?
Each pixel stores a different colour based on the image and are arranged in a grid format. They are so small that they cannot be seen.
How do you improve the quality of the image?
By making the imaging higher resolution and with colour depth.
What is colour depth?
Colour depth is using more colours to make an image look more realistic.
What is resolution?
Resolution is to increase the number of pixels to make an image more realistic.
How are colour depth and resolution used to create high-quality images?
Photos need many colours to look realistic. Colour depth is to use kore colours to make an image more realistic. Resolution is to increase the number of pixels in an image to make it more realistic. In low-resolution images, you would be able to see the pixels.
Why are high-quality files larger than low-quality files?
It is because high quality files have high quality resolution and colour depth which needs to be stored using more bytes. The bytes store the pixels and colours.
What is digital data?
Digital data is data stored as numbers.
Name 4 things which can be stored using digital data.
- Instructions
- Text
- Sound
- Images
What is a bit?
A bit is a digit in a binary number.
What is a byte?
A byte is made up of 8 bits.
What is the difference between a bit and a byte?
A bit is a digit in a binary number and a byte is made up of 8 bits.
How are pixels used to make digital images?
Pixels store colour data based on the image and are arranged in a grid format. Each pixel is so small that you cannot see it.
What is colour depth?
Colour depth is to use more colours to make an image more realistic.
What is resolution?
Resolution is to increase the number of pixels to make an image more realistic.
How are colour depth and resolution used to create high quality images?
Pictures need many colours to look realistic. Colour depth is to use more colours to make an image more realistic. Resolution is to use more pixels to make an image more realistic. In low quality images, you would be able to see the pixels.
Why are high quality files larger than low quality files?
It is because high-quality files have higher resolution and colour depth which require more pixels and colour. These pixels and colours need be stored using more bits.
What are pixels?
Pixels are tiny squares that make up an image. Each pixel stores a colour and are arranged in a grid format.
High quality audios have ….
A high sampling rate
How is sampling used to store digital audio?
A computer cannot store continuous data so it uses sampling to break the data into chunks which and then saves as bytes.
What is sampling?
A computer cannot store continuous data. Sampling is the process of breaking the data into chunks which are then saved as bytes and put together to make the audio sound continuous.
