WJEC GCSE DigiTech Unit 1.1.2 Sound

What causes sound waves to be created?

• Vibrations in the air

• Light reflections

• Water movement

• Magnetic fields

What does technology do to sound waves?

• Converts them into digital form

• Changes them into light waves

• Makes them louder

• Turns them into images

What is the process of taking samples at regular intervals when recording sound called?

• Sampling

• Filtering

• Amplifying

• Mixing

What is the unit used to measure sample rate?

• Hertz (Hz)

• Decibels (dB)

• Watts (W)

• Volts (V)

What happens to the quality of a digital sound file if more samples are taken at regular intervals?

• The quality increases

• The quality decreases

• The file becomes quieter

• The file becomes unreadable

What is a direct result of increasing the number of samples taken when digitizing sound?

• Increase in file size

• Decrease in file size

• Lower sound quality

• Faster playback speed

What does ADC stand for in the context of sound digitization?

• Analogue to Digital Converter

• Audio Data Controller

• Automatic Data Calculator

• Analogue Data Computer

During the conversion process, what are samples converted from and to?

• From analogue to digital

• From digital to analogue

• From binary to decimal

• From text to sound

What is bit depth?

• The number of bits available for each sample

• The number of samples per second

• The length of a sound file

• The speed of sound

How does increasing bit depth affect a sound file?

• Increases the dynamic range of volume

• Decreases the file size

• Makes the sound quieter

• Reduces the number of samples