Audio Engineering - Audio File Compression

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| By Chris_s_brookes
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Audio Engineering Quizzes & Trivia

In relation and preparation for worksheet 3


Questions and Answers
  • 1. 

    What does MP3 stand for?

    • A.

      MPG Layer 3

    • B.

      Motion Picture Entertainments Group Layer 3

    • C.

      Motion Picture 3

    • D.

      Music Process 3

    Correct Answer
    B. Motion Picture Entertainments Group Layer 3
    Explanation
    MP3 stands for Motion Picture Entertainments Group Layer 3. This format is commonly used for audio files and is known for its ability to compress audio data without significant loss in quality. The term "Motion Picture Entertainments Group" refers to the organization responsible for developing the MP3 format, while "Layer 3" refers to the specific layer within the format that handles audio compression.

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  • 2. 

    What does WMA stand for?

    • A.

      Windows Media Audio

    • B.

      Wireless Movie Audio

    • C.

      Wireless Media Audio

    • D.

      Word Media Access

    Correct Answer
    A. Windows Media Audio
    Explanation
    WMA stands for Windows Media Audio. This audio format was developed by Microsoft and is commonly used for compressing and storing audio files. It provides a high level of audio quality while maintaining a relatively small file size, making it suitable for streaming and downloading music online.

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  • 3. 

    What does FLAC stand for?

    • A.

      File Lossy Audio Codex

    • B.

      Function Lossless Audio Codec

    • C.

      Free Lossless Audio Codec

    • D.

      F-Codec

    Correct Answer
    C. Free Lossless Audio Codec
    Explanation
    FLAC stands for Free Lossless Audio Codec. It is a widely used audio format that allows for lossless compression, meaning that the audio quality remains unchanged while reducing the file size. Unlike lossy codecs, such as MP3, FLAC retains all the audio data, resulting in an identical reproduction of the original audio source. FLAC is popular among audiophiles and music enthusiasts who prioritize high-quality sound and want to preserve the integrity of their audio files.

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  • 4. 

    Which of the following file types use lossy compression

    • A.

      Wav

    • B.

      AIFF

    • C.

      MP3

    • D.

      WMA

    • E.

      RA / RAM (Real Audio Media)

    • F.

      FLAC

    • G.

      AAC

    • H.

      ALAC

    • I.

      REX

    Correct Answer(s)
    B. AIFF
    C. MP3
    D. WMA
    E. RA / RAM (Real Audio Media)
    G. AAC
    Explanation
    AIFF, MP3, WMA, RA/RAM (Real Audio Media), and AAC are file types that use lossy compression. Lossy compression is a method of reducing file size by permanently discarding certain information that is deemed less important to the overall quality of the audio. This results in a smaller file size but also a loss in audio quality. These file types are commonly used for music and audio files where a slight loss in quality is acceptable in exchange for smaller file sizes and easier file sharing.

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  • 5. 

    Which of the following are examples of Lossless Audio Compression?

    • A.

      Wav

    • B.

      AIFF

    • C.

      MP3

    • D.

      WMA

    • E.

      RA / RAM (Real Audio Media)

    • F.

      FLAC

    • G.

      AAC

    • H.

      ALAC

    • I.

      REX

    Correct Answer
    H. ALAC
    Explanation
    ALAC (Apple Lossless Audio Codec) is an example of lossless audio compression. Lossless compression algorithms reduce the file size of audio without sacrificing any audio quality. ALAC is specifically designed for Apple devices and provides high-quality audio playback while maintaining the original audio data. It achieves compression by removing redundant information from the audio file, resulting in a smaller file size without any loss of audio fidelity.

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  • 6. 

    Which of the following factors have an impact upon the file size of an uncompressed file

    • A.

      Sample Rate

    • B.

      Bit Depth

    • C.

      Stereo Image

    • D.

      Whether the file is mono or stereo

    • E.

      Length of the Audio File

    • F.

      Number of different frequencies used

    • G.

      Dynamic Range

    • H.

      Repetitions within the audio file

    Correct Answer(s)
    A. Sample Rate
    B. Bit Depth
    D. Whether the file is mono or stereo
    E. Length of the Audio File
    Explanation
    The file size of an uncompressed file is impacted by the sample rate, bit depth, whether the file is mono or stereo, and the length of the audio file. The sample rate determines the number of samples taken per second, so a higher sample rate will result in a larger file size. The bit depth determines the number of bits used to represent each sample, so a higher bit depth will also result in a larger file size. Whether the file is mono or stereo affects the number of audio channels, with stereo requiring more data. Finally, the length of the audio file directly affects the file size, as longer files contain more data.

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  • 7. 

    If a typical dance song was stored in the following formats, which is likely to have the smallest file size

    • A.

      WAV @ 44.khz, 16 bit, Stereo

    • B.

      AIFF @ 48khz, 16bit, Mono

    • C.

      FLAC @ Medium Processing Time Compression

    • D.

      MP3 @ 192kb/ps

    Correct Answer
    D. MP3 @ 192kb/ps
    Explanation
    MP3 @ 192kb/ps is likely to have the smallest file size compared to the other formats mentioned. MP3 is a compressed audio format that uses lossy compression, meaning it reduces the file size by discarding some audio data that is less perceptible to the human ear. The bitrate of 192kb/ps indicates the amount of data processed per second, and a lower bitrate results in a smaller file size. Therefore, the MP3 format with a bitrate of 192kb/ps would have a smaller file size compared to the uncompressed WAV and AIFF formats, as well as the lossless FLAC format.

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  • 8. 

    Which of the following file types would VBR relate to?

    • A.

      WAV

    • B.

      MP3

    • C.

      ALAC

    • D.

      FLAC

    Correct Answer
    B. MP3
    Explanation
    VBR stands for Variable Bit Rate, which is a method of encoding audio files. It allows for the compression of audio files by varying the number of bits used to represent the audio data, depending on the complexity of the sound at any given moment. This results in a smaller file size compared to a constant bit rate encoding. MP3 is a widely used audio file format that supports VBR encoding, making it the correct answer in this case.

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  • 9. 

    In relation to a lossy audio file, which of the following statements are true about Bit Rate

    • A.

      The higher the bit rate the lower the accuracy to the original uncompressed file

    • B.

      The lower the bit rate the higher the accuracy to the original uncompressed file

    • C.

      Bit Rate is the maximum amount of data that can be stored per second

    • D.

      Bit Rate is the minimum amount of data that can be stored per second

    Correct Answer
    C. Bit Rate is the maximum amount of data that can be stored per second
    Explanation
    The statement "Bit Rate is the maximum amount of data that can be stored per second" is correct. Bit rate refers to the amount of data that is processed or transmitted per unit of time, usually measured in bits per second (bps). In the context of a lossy audio file, a higher bit rate means that more data is being used to represent the audio, resulting in a higher quality and closer accuracy to the original uncompressed file.

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  • 10. 

    Which of the following is NOT likely to affect the file size of a lossless compression process

    • A.

      Repetition within the content of the audio

    • B.

      Frequency Range

    • C.

      Time taken by the encoder

    • D.

      Bit Rate of the encoder

    Correct Answer
    D. Bit Rate of the encoder
    Explanation
    The bit rate of the encoder is not likely to affect the file size of a lossless compression process. Bit rate refers to the amount of data processed per unit of time, and it determines the quality and size of the compressed file in lossy compression. However, in lossless compression, the file size is determined by the redundancy and patterns within the content, repetition within the audio, frequency range, and the time taken by the encoder. Therefore, the bit rate of the encoder does not directly impact the file size in lossless compression.

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