BSc (Hones)
in Information Technology Specialized in Interactive Media
Batch 2016
Multimedia Systems
Tute 4
R.A.P.C.P RANASINGHE
IT14115394
Discuss the implications of using audio in a production,
focusing on the purpose of the audio, how to manage audio files, and copyright
issues.
Audio is the most entertainment
path of the life. Music can touch human’s heart easily. Sound can get the
attention rapidly, there for music clip embedded with a presentation it can get
the attention and can remember very well. Copyright
protection can exist for all works created in any medium.
1.
List the four main sampling rates and the two sampling depths. Briefly
describe what each is most useful for. How does mono versus stereo come into
the equation?
Main Sampling Rates
32,000 Hz - Standard
Broadcast Rate
44,100 Hz - CD
Quality
48,000 Hz - Standard
DVD
96,000 Hz - Blu-Ray DVD
Quality
Sampling Depths
16 bit - CD/DVD Audio/Pro
Tools & LogicPro software.
24 bit - Blu-Ray Disc//Pro
Tools & LogicPro software.
Stereo - Stereo
has two independent channels. One for left and other one for Right. Both these
signal are similar but not exactly the same.
Mono - Mono
has only one channel. There for using Mono, listener can’t get the feeling
sense of depth as Stereo.
The Equation of the Mono and
Stereo
Mono
 Sampling rate * duration of recording
in seconds * (bit resolution / 8) * 1
Stereo
 Sampling rate * duration of
recording in seconds * (bit resolution / 8) * 2
No of channels
|
2.
You have been assigned to design and produce the audio portions of a
multimedia project. The program will be delivered on a CD-ROM, and video clips
will take up most of the CD. You have only 50MB of storage space to store 20,
one-minute clips of speech, 10 songs averaging three minutes long, and a
background sound loop. What sampling rates and depths should you use for the
speech, for the music, and for the background sound? Why? Roughly calculate the
file size totals for these specifications, and be sure that you end up with
less than the 50MB of storage space allotted. Discuss your reasoning.
20 minute Speech
60 seconds * 96 kbps = 5760 kb
5760/8 = 720 kB
20 * 0.72 = 14.4 MB
Average 3 Minute Music tracks
180 seconds * 128kbps = 23,040
kb
23,040/8 = 2880 kB
10 * 2.88 = 28.8 MB
Background Sound
180 seconds * 128kps = 23,040 kb
23,040/8 = 2880 kB
Total space required: 14.4 +
28.8 + 2.8 = 46 MB
For 20 one-minute speech, I
choose to use 96 kbps bit rate. It’s good if I choose 128 kbps bit rate same as
others. But when I used 128 kbps bitrate to the speeches it will exceed the 50 MB
file size (50.8 Mb). I used 128kbps bit rate for the songs and 128kbps bit rate
for background sound because Music feels us than speeches. We can spot the
distortion of the music easily than speech.
3.
Describe what MIDI is, what its benefits are, and how it is best used in
a multimedia project.
MIDI stands for Musical Instrument Digital Interface. MIDI allows
electronic instruments and other digital musical tools to create a bridge and
make excellent music. A MIDI instrument is developed using part of the Software
and part of the Hardware. We can use compose music..
Benefits of MIDI
1. Minimum file size - An entire Music can be
stored within a few bytes.
2. Easy to modify - Change
pitch, duration, and other parameters without having
to rerecord.
3. Quality - Can get Better Quality
Sounds
4.
List the steps you would go through to record, edit, and process a set of
sound files for inclusion on a web site. How would you digitally process the
files to ensure they are consistent, have minimum file size, and sound their
best?
·
Quality of the music
·
Be simple
·
Allow the user to customize settings whenever possible
·
The file size
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