Sound Files, Part 3: Understanding MP3 Files and Compression

Why is it important to reduce the size of sound files on your device?

• To improve sound quality

• To save storage space

• To increase the volume

• To make files easier to edit

How many times per second does a sound wave get sampled?

• 16,000 times

• 44,000 times

• 65,000 times

• 100,000 times

What is a key characteristic of WAV files?

• They are highly compressed

• They are only used for video

• They are non-compressed

• They have low quality

Why are MP3 files more commonly used than WAV files?

• They are smaller in size

• They are larger in size

• They have better sound quality

• They are easier to create

What is the main method used to reduce the size of MP3 files?

• Increasing the sampling rate

• Changing the file format

• Removing some information

• Adding more bits

What type of information is removed during MP3 compression?

• Information that is hard to hear

• All low frequencies

• All high frequencies

• Important tones

Why can certain tones be removed without affecting the perceived sound quality?

• They are redundant

• They are too quiet

• They are too loud

• They are inaudible to human ears

What does the 'standard' level of MP3 compression do?

• Removes very little information

• Removes a lot of information

• Removes a reasonable amount of information

• Removes no information

What is the benefit of using the 'insane' level of MP3 compression?

• It removes a lot of information

• It keeps the file size large

• It maintains high quality

• It makes the file very small

What is the main trade-off when using higher levels of MP3 compression?

• Larger file size

• Lower sound quality

• More storage space

• Better sound quality