MP3 Compression — Questions and answers
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What group was created in 1988 to help make standards for audio and video compression?
Choices
- The Fraunhofer Society
- The ASPEC team
- The Moving Picture Experts Group (MPEG) ✓
- The International Sound Organization
Answer: The Moving Picture Experts Group (MPEG)
From page 5
What two main techniques were essential for MP3 compression?
Choices
- Simple truncation and aggressive filtering
- The Modified Discrete Cosine Transform (MDCT) and a sophisticated psychoacoustic model ✓
- Just making sounds quieter and louder
- Using only loud sounds and no quiet sounds
Answer: The Modified Discrete Cosine Transform (MDCT) and a sophisticated psychoacoustic model
From page 6
What two kinds of 'masking' did the MP3 psychoacoustic model use to reduce file size without losing sound quality?
Choices
- Color masking and shape masking
- Loudness masking and quietness masking
- Frequency masking and temporal masking ✓
- Echo masking and distortion masking
Answer: Frequency masking and temporal masking
From page 7
In what year was the MP3 format officially standardized?
Choices
- 1980
- 1993 ✓
- 2000
- 1988
Answer: 1993
From page 8
How did MP3 technology change the music industry?
Choices
- It made music only available on CDs and tapes.
- It made music harder to find and share.
- It made music available to more people and helped create online music stores and streaming services. ✓
- It made all music free forever.
Answer: It made music available to more people and helped create online music stores and streaming services.
From page 9
What is one lasting effect of MP3 compression, even with newer audio formats available?
Choices
- It stopped people from listening to music on the go.
- It showed that high-quality audio could not be in small files.
- It helped create personal music players and streaming services we use today. ✓
- It made all music sound bad.
Answer: It helped create personal music players and streaming services we use today.
From page 10