OCR Computer Science: 9 - 1 Sound

What unit is sample rate measured in?

• Bits per second

• Hertz

• Megabits per second

Which of the following is not true if you increase the sample rate?

• Better quality of recording

• Needs greater storage space

• Larger file size

• Decrease in quality

What is meant by bit depth?

• 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?

• File size increases

• Sound quality increases

• Sound quality decreases

• Number of sound samples take per second increases

What is measured when the wave is sampled?

• Amplitude

• Hertz

• Bit rate

• Frequency

What sample rate is used for CD quality sound?

• 44,100Hz

• 88,200Hz

• 22,100Hz

The purpose of a Digital to Analogue converter is to...

• 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 a computer

• Speaker

• Analogue to Digital converter

• Microphone

• Digital to Analogue converter

If you increase the bit depth of an audio file then you increase the quality?

• True

• False

The amplitude of a sound wave is...

• How high the wave is from crest to trough

• The frequency at which it is sampled

• The speed at which it travels through the air