Quiz 2 on Noise-Cancelling Headphones(L3 공통영어1)

What is the technology used in noise-cancelling headphones?

• Echo cancellation

• Sound amplification

• Constructive interference

• Destructive interference

What do the microphones in noise-cancelling headphones do?

• Play music

• Pick up outside sounds

• Increase volume

  • increase 증가시키다

• Generate sound waves

  *generate 발생시키다

If outside noise has a value of +1, what value does the circuitry generate?

• 1

• +1

• -1

• 0

Why is it difficult to entirely eliminate external noise with noise-cancelling technology?

• It only works for predictable sounds

• It is too expensive

• It cannot process sounds quickly enough

• It needs too much power

Which type of sounds are noise-cancelling headphones most effective against?

• Soft sounds

• Inconsistent sounds

  일관되지 않은 소리

• Predictable sounds

• Loud sounds

What must the circuitry do to achieve full noise cancellation?

• Use larger speakers

• Increase the volume of music

• Reduce the battery usage

• Convert noise into digital data

How do noise-cancelling headphones transmit the opposite sound?

• Instantly to the speakers

• By using a remote control

• Via analog signals

  아날로그 신호를 통해(via)

• Through Bluetooth

What is a limitation of noise-cancelling headphones mentioned in the text?

• They are too heavy to wear

• They cannot cancel out all types of noise

• They only work with specific brands of music

• They need constant charging

  *constant 끊임없는

Which of the following is an example of a predictable sound?

• Birds chirping

  지저귐

• People talking

• Car engines

• Music playing

What is the main benefit of noise-cancelling headphones?

• Longer battery life

• Wireless

• Clear music without increasing volume

• Cheaper than regular headphones