Unit 1.2.4 - Sound

What unit is sample rate measured in? (1-4)

• Bits per second (bps)
• Hertz (Hz)
• Megabits per second (Mbps)

Which of the following is not true if you increase the sample rate? (3-6)

• Better quality of recording
• Needs greater storage space
• larger file size
• Decrease in quality

What is meant by bit depth? (3-6)

• The number of samples taken per second
• The amplitude of each sample
• The number of bits used per second of audio
• The number of bits used to store each sound sample

Which of the following is true if you decrease the bit rate? (3-6)

• File size increases
• Sound quality increases
• Sound quality decreases
• Number of sound samples taken per second increases

What is measured when the wave is sampled? (3-6)

• Amplitude
• Hertz
• Bit rate
• Frequency

What sample rate is used for CD quality sound? (6-8)

• 44,100 Hz
• 88,200 Hz
• 22,100 Hz

The purpose of a Digital to Analogue converter is to… (6-8)

• convert binary data into analogue form so we can hear it via a speaker
• convert sound waves into binary so it can be understood by a computer

What piece of hardware would you use to input sound into acomputer? (1-3)

• Speaker
• Analogue to digital converter
• Microphone
• Digital to analogue converter

If you increase the bit depth of an audio file then you increase thequality? (1-4)

• True
• False

The amplitude of a sound wave is… (6-9)

• how high the wave is from the crest or trough
• the frequency at which it is sampled
• the speed at which it travels through air