Chapter 4

Question 1

Introduction sound

Answer 1

• is the best way to attract attention
• often audio provides the only effective way to convey an idea, elicit an emotion, or dramatize point.
• sounds also can be combined in a multimedia presentation to provide information and enhance the other media being presented.

Question 2

What is sound

Answer 2

• Sound is a natural phenomenon that involves pressure and vibration
• What we perceive as sound traveling across time and distance is actually the invisible moving presence of a sound pressure wave
• sound waves are a special type of energy and require a molecular medium for propagation.
• they can travel through solids, gases, or liquids, but air molecules are the best transmission medium.
• amplitude (vertical), frequency (horizontal)

Question 3

Sound (digital audio, MIDI)

Answer 3

• digital audio data is the actual representation of sound, stored in the form of samples.
• samples represent the amplitude (or loudness) of sound at a discrete point in time
  -MIDI (Musical Instrument Digital Interface)
• shorthand representation of music stored in numeric form.
• not digitized sound
• require sequencer software and sound synthesizer.

Question 4

Adding sound to multimedia project

Answer 4

• file formats compatible with multimedia authoring software being used along with delivery mediums, must be determined
• sound playback capabilities offered by end user’s system must be studied
• the type of sound, whether background music, special sound effects, or spoken dialog, must be decided.
• digital audio or MIDI data should be selected on the basis of the location and time of use.