iGCSE Computer Science: Digital Audio

What piece of hardware is used to sample a sound wave?

• Digital-analogue converter

• Wave synthesizer

• Microphone

• Analogue-digital converter

What does the bit rate of a sampled sound refer to?

• The number of bits used for 1 second of audio

• The number of bits used for every sample

• The final file size of the sampled sound

• The speed at which the sampled sound is played back

What is the standard sampling frequency for CD audio?

• 20,000 Hz

• 44,100 Hz

• 33,300 Hz

• 96,000 Hz

What is the main uncompressed audio file format?

• .mp3

• .mp4

• .wav

• .mov

What is most commonly used compressed audio file format?

• .wav

• .mp3

• .mp4

• .ogg

One factor that affects the quality of digital audio is the bit depth. What does this refer to?

• The number of bits used to store each sample

• The overall size of the sampled sound

• The number of bits needed for 1 second of audio

• The number of samples taken every second

Which of these are factors in determining the amount of storage needed for a digitally sampled sound? (select all that apply)

• The number of samples taken per second

• The bit depth per sample

• The length of the sampled sound

• The range of wave frequencies present in the sound

• The type of audio sampled (voice, music, etc)

Which of these are factors in determining the quality of a sampled sound? (select all that apply)

• The number of samples taken per second

• The number of bits used to store each sample

• The length of the sampled sound in seconds

• The range of wave frequencies present in the sound

Which of these variables affect the file size of a sampled sound? (select all that apply)

• the bit depth

• the sampling frequency

• the bit rate

• the length of the sampled sound

• the type of sound (speech, music etc)

What is the name of a popular freeware audio manipulation software?

• Soundshop

• Sonacity

• Audacity

• Wave Studio