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8th -



A Room-Sized Computer in Your Digital Music Player


7 questions

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  • 1. Multiple Choice
    30 seconds
    1 pt

    According to the text, what did the disaster at Pearl Harbor show that the U.S. military leaders needed?

    a way to improve the speed of the telegraph code

    a secure system for communication with their troops

    a way to prepare military bases' defenses more quickly

    a secure system for recording and playing music

  • 2. Multiple Choice
    30 seconds
    1 pt

    In this text, the author describes a sequence of technological developments.

    In what order were these technologies created?

    the Vocoder, SIGSALY, CDs, MP3 music files

    MP3 music files, SIGSALY, CDs, the Vocoder

    CDs, MP3 music files, the Vocoder, SIGSALY

    SIGSALY, the Vocoder, CDs, MP3 music files

  • 3. Multiple Choice
    30 seconds
    1 pt

    The method used by SIGSALY to encode messages was more effective than the method used by the Scrambler to encode messages.

    What evidence from the text best supports this conclusion?

    More than 3,000 high-level conversations happened over SIGSALY, covering troop movements, equipment drops, and military strategy.

    Marshall didn't trust the Scrambler for his secure military communications, so he decided to send his message to Hawaii via telegraph code.

    The SIGSALY system saw the first transmission of speech using pulse-code modulation and the first effective use of bandwidth compression to recreate speech.

    The Germans were able to crack the code for the Scrambler, while no record has ever been found of the German or Japanese militaries decoding SIGSALY's messages.

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