GCSE Computer Science Sound

Which is true of sound waves and computers?

• Sound waves are analogue but computers only understand digital signals.

• Sound waves are digital but computers only understand analogue signals.

• Sound waves and computers both use digital signals

• Sound waves and computers both use analogue signals

When recording a sound, computers take measurements at regular intervals. This is called

• Interval selection

• Parameters

• Sampling

• Digital signals

When sampling sound waves, computers take various measurements such as (tick all)

• loudness

• frequency

• quality of the music

• genre

• height/amplitude of sound wave

An audio CD is typically sampled at

• 44 times per second (44.1kHz)

• 4,410 times per second (44.1kHz)

• 44,100 times per second (44.1kHz)

• 44,100,000 times per second (44.1kHz)

A higher sample rate means (tick all that apply)

• A better quality/more accurate recording

• A lower quality/less accurate recording

• A larger file size required to store the final recording

• A small file size required to store the final recording

A lower sample rate means (tick all that apply)

• A better quality/more accurate recording

• A lower quality/less accurate recording

• A larger file size required to store the final recording

• A small file size required to store the final recording

A common method of reducing the size of a sound file is

• reduction

• compression

• shortening

• squishing

When compressing an audio file, the algorithm tries to

• Remove the beginning and end of the file

• Remove the audio that humans typically can't hear

• Remove every other note

• Change the frequency of the recording

When a sound wave is sampled..

• ...the parameters/measurements are converted into binary

• ...the parameters/measurements are converted into denary

• ...the parameters/measurements are converted into hexadecimal

• ...the parameters/measurements are converted into analogue waves

In sampling, the interval rate means

• The number of samples per second

• The height of the wave

• The beat of the track

• The number of bits in a byte