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Unformatted text preview: and fade-out, layering, zooming, and
rotation of objects.
Computer audio deals with synthesizing, recording, and playback of audio or
sound with the aid of a computer. Audio is another very important component of
multimedia because in many cases sound can substantially reinforce our
understanding of information presented in other ways, and in some cases sound is
the only way to provide the desired information. For example, in the multimedia
application meant for educating small children (our previous example), voice
explanation can be added to the animation clip describing what is being shown and
pointing out what to look for that makes a horse's gallop different from a horse's
walk. Similarly an animation clip can show the horse neighing and neighing sound
can be added to effectively convey the type of sound horses make. Note that it is
nearly impossible to provide an accurate description of a horse's neigh, a lion's
roar, or a bird's chirp using text, and graphics is of no help in these cases. Hence
sound is the only media that can accurately provide such information. Analog and Digital Audio
Audio information travels in natural media in the form of sound waves, which are
analog in nature. In order for the computer to be able to understand audio
information, sound waves must be converted from analog form to digital form.
Transducer is a device capable of changing signals from one form to another. For
example, microphone is an example of a transducer that converts sound waves into
electrical signals. Conversely, loudspeaker is an example of a transducer that
converts electrical signals into sound waves.
Information can be represented as analog signals or digital signals. Analog signals
exhibit a/ continuous tone of smooth fluctuations, while digital signals are
composed of discrete values represented by numbers. The transformation between
analog and digital signals is achieved by A/D (Analog-to-Digital) conversion and
D/A (Digital-to-Analog) conversion. A/D conversio...
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This document was uploaded on 04/07/2014.
- Spring '14