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Lengel, WWGT Multimedia
Test Bank, Chapter 4
Short Answer
1. Describe 3 different types of sounds on the web.
Answer: voice, music, sound effects
2. List at least 4 purposes for including sound on your web site.
Answer: Sound can convey information, set a mood, capture attention, explain a process, or
provide a sense of personal contact.
3. What is the difference between downloaded sound and streaming sound?
With downloaded sound, the sound is first downloaded to the user’s computer. Then it either
plays automatically or when the user clicks on a link. Each sound must be created and saved as a
separate file. In streaming sound, the file plays as it arrives at the user’s computer and is never
actually downloaded to a disk. In live streaming sound, no file is prepared in advance.
4. What are the two major types of sound files for the web?
Answer: sampled sound and MIDI sound
5. Explain what is meant by “a 44 kHz sampling rate?”
Answer: The computer divides a continuous sound into samples, or records the loudness and
pitch at particular moments. The loudness and pitch of each sample are represented by numbers.
If one sample is taken 44,000 times per second, it is called a sampling rate of 44 kilohertz.
6. What are the three stages in preparing a sampled sound for the web?
Answer: A sampled sound must be digitized, edited and saved in a suitable format
7. What is a MIDI sound? What is the main advantage of this method?
Answer: MIDI is a method for representing sounds produced by electronic musical instruments.
MIDI files are much smaller than other formats. The instruments produce numbers instead of
soundwaves, and require less data.
8. Describe the path from a human voice to an audience via the internet.
Answer: The person speaks into a microphone. The microphone converts the sound waves into
an electric signal, which the computer samples and converts to numbers. This digital file is
uploaded to a web server. Through the web browser, the audience computer downloads the
digital file from the web server through data packets. When the audience plays the sound, the
computer converts the string of numbers into a continuous electrical signal, which is sent to a
speaker or headphones. The computer speakers create sound waves in the air which are picked
up by the ears of the listener.
9. Under which conditions would you use streaming audio?
Answer: When you are presenting live events, when the sound requires very large files, if you
need to save download time, if you need to secure your files from being copied, if you need to
conserve bandwidth
10. What are some factors to consider in choosing a file format for sound?
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Lengel, WWGT Multimedia
Test Bank, Chapter 4
The nature of the sound, the way you plan to embed the sound in your site, the plug-ins your
audience is likely to have, the type of sound-editing software you use, the kind of streaming
server that your organization uses
11. What hardware is necessary to sample sound?
Answer: A sound input device such as a microphone, a sound input connector on the computer,
and analog-to-digitry circuitry inside the computer.
12. What are the functions of sound-editing software?
Answer: Capture the sound from a source, display the sound on the screen in a form which
makes editing possible, edit the sound, combine sounds from several sources, apply effects, mix
various tracks into a single file, and compress and save the file.
13. What are some methods for capturing sound into your computer?
Answer: through a microphone or tape player, from music CDs or music data files.
14. What are two methods of including sound in a web page? What are the advantages to each
method?
Answer: Embedding and linking. Embedding provides a smoother viewer experience and lets
you integrate the sound more carefully with the other page elements. It also lets you play the
sound in the background with no visual interruption and the developer can set certain user
control parameters to control how the sound s plays. Linking sets up a separate browser window
for the sounds, and this window can be manipulated by the user independently from the rest of
the content of the page.
15. What should you consider before you decide to add sound to your web site?
Answer: the amount of bandwidth available to visitors, should the sound be hidden, automatic,
and uncontrollable, should the sound be embedded or linked, will the audience tire of a sound on
a menu page, will the audience have the patience to wait for a large sound file to download.
Multiple Choice
1. Which is not a correct filename extension for sound?
a) .aif
b) .mov
c) .mp3
d) .gif
Answer: d
2.
a)
b)
c)
d)
<a href=”click.ram”>click here</a> is the html for the following:
an increase in memory
a linked sound
a QuickTime file
an embedded sound
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Lengel, WWGT Multimedia
Test Bank, Chapter 4
Answer: b
3. Sound editing software allows you to
a) stream sound from a server
b) embed the sound in a web page
c) compress sound files
d) all of the above
Answer: c
4. Which is an advantage of streaming sound?
a) easy set-up
b) saves download time
c) a network does not need to be multicast enabled
d) better sound quality
Answer: b
5. In order to be used for a website, a sampled sound must be
a) digitized
b) converted to MIDI
c) streamed from a server
d) embedded in a website
Answer: a
True/False
1. Sound is a newcomer to the web
Answer: T
2. A web server does not send out an entire website file in one continuous string of data.
Answer: T
3. 22 kHz is an acceptable sampling rate for the human voice.
Answer: T
4. MIDI files are much smaller than sampled sound.
Answer: T
5. Only high-pitched sounds can be successfully sampled.
Answer: F
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