Edexcel GCSE Computer Science Topic 3 b

Sound waves must be samples to create digital sound. A sample is...

• a measure of amplitude at a point in time

• the number of samples taken per second

• the file size of an image

When recording sound, the number of samples recorded per second is called the:

• sample rate

• sample resolution

• colour depth

• File size

To calculate the size of a sound file:

• colour depth * resolution

• sample rate * sample resolution * length in seconds

• number of samples * sample rate

• sample resolution squared

Increasing the sample rate of a recording will result in...

• Higher-quality sound recording

• Increased file size

• Better compression

• Higher colour depth

• Increased amplitude

how many bits are in 2 kilobytes?

• 2
• 2 x 1024 x 8 = 16384
• 2 x 1024 = 2048

A byte is

• 8 bits
• 4 bits

In computing, a bit is

• 8 bytes
• a single    0 or 1     on or off

How many megabytes are in 1 gigabyte?

• 1024
• 1
• 1024 x 10 = 10240

how many megabytes are in 4 gigabytes?

• 4
• 4 x 1024 = 4096
• 1024

A gigabyte consists of 1024:

• megabytes
• terabytes
• kilobytes
• nibbles