Grade VIII, Chapter 5

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Learn with Hafiza Palwasha


OXFORD (Book 8), KEYBOARD
Computer Science With Application Software (Third Edition).

Solution

Chapter No. 5
Audacity

NEW WORDS
Students should extract new words by themselves from chapter No. 1 and write them on neat copies as vocabulary words. There is no need to memorize these words but students should be able to read and understand these words as I explained and discussed in class.

NEW TERMS AND ABBREVIATIONS
Students should learn these terms and abbreviation. It will be the part of exam.
1.    Audacity:
       It is a free software which is used to record and edit the sound or audio.
2.    Envelope:
       It is a tool of Audacity which helps to make smooth volume changes.
3.    Time Shift:
       It is a tool of Audacity which helps to sync audio according to the timeline by dragging audio clips or tracks.
4.    Transcription Toolbar:
       It is responsible to change the speed of audio track depending on the requirement. We can play the audio track with fast or slow speed.
5.    Selection Toolbar:
       It is responsible to select the starting and ending time to adjust the correct timeframe of audio for videos. It is used to precise timings for audio tracks.
6.    Meter Toolbar:
       It determines the overall sound levels for audio track.
7.    Stereo waveform:
       The type of waves that are formed with two channels named right channel and left channel. In audacity left channel displayed in bottom half while right channel displayed in top half.
8.    Mono:
       Mono means one.
9.    Clipping:
       It is a type of distortion in which harsh sound produce at the distorted points during playback in the recording.
10.  Vocal Recording:
       It is the type or characteristic of recording in which the recording quality is maintain as much as possible in such a way that playback will be as true sounding as feels in original performance.
11.  Frequency:
       Rate of change of vibrations or waves with respect to time.
12.  Amplitude:
       It is the maximum peak of the wave or oscillation with respect to the equilibrium position.
13.  Sample:
       It is the unit of audio data.
14.  Sample Rate:
       It is the rate of change in audio data with respect to time.

Exercise
Solution

Page No. 98 & 99
Objective Type Questions
Q No. 1: Choose the correct option.
Solution:
a.   Which of the following audio file formats can be opened in Audacity?
       iv. all of these (is correct)
b.   You can listen to the selected audio by pressing the __________ key.
       i. Spacebar (is correct)
c.   To create a copy of the selected audio on a new track, press
       iii. Alt + D (is correct)
d.   The Noise Removal option is available in the __________ menu.
       i. Effect (is correct)
e.   To select the entire track, press
       i. Ctrl + A (is correct)
f.   The Audacity project files are saved in the __________ format.
       ii. .aup (is correct)
g.   Which of the following options are available in the File menu?
       i. Import (is correct)
h.   The keyboard shortcut for the Paste option is
       ii. Ctrl + V (is correct)

Page No. 99
Descriptive Type Questions
Q No. 1: Answer the following.
a. How can you create a copy of the selected audio on the same track?
Answer: Lab work (will be discuss in Computer lab. Students do not have to do this question on neat copies).

b. List the steps to export an audio file so that it can be opened in a program like Windows Media Player.
Answer: Lab work (will be discuss in Computer lab. Students do not have to do this question on neat copies).

c. What are the default values for the Default Sample Rate and the Default Sample Format?
Answer: The default value for the Default Sample Rate is 44100Hz and the default value for the Default Sample Format is 32-bit float.

d. List the different audio file formats that can be opened in Audacity?
Answer: Following are the audio file formats that can be opened in Audacity:
1. Wav
2. AIF
3. MP3

e. How can the duration of an audio be measured?
Answer: To measure the duration of an audio we use the ruler, representing timeline above the waveform. It is measured in minutes and seconds.

f. Mention two ways in which you can paly an audio.
Answer: Following are the two ways in which you can play an audio:
1. Using button on the transport toolbar.
2. By pressing button on the Spacebar.

g. Can you change the name of a track? How?
Answer: Lab work (will be discuss in Computer lab. Students do not have to do this question on neat copies).

h. How can you import a music file as a background?
Answer: Lab work (will be discuss in Computer lab. Students do not have to do this question on neat copies).

i. Asad has downloaded Audacity on to his computer to listen to music. Unfortunately, he is unaware of the file formats that are supported by this software programme. List the different formats that can be played on Audacity and give their properties. Do you think it is important for there to be restrictions on how this software can be used? Why is it important for 'free, open source' software to be available to use? Do you think it is actually free?
Answer: The different formats that can be played on Audacity and their properties are:
WAV:
1. It is used for raw data.
2. It is used for uncompressed data.
3. It is compatible with the following:
    * Windows
    * Mac OS
    * Linux OS
4. It's size is large, so usually we cannot share easily over internet.
AIFF:
1. It is compatible with the following:
    * Windows
    * Mac OS
    * Linux OS
2. It has better sound quality compare to WAV.
MP3:
1. The format is developed by moving pictures.
2. It is good quality of sound compare to WAV and AIFF.
3. It is most popular because the files can easily compress and because of this property the file size becomes small and can easily transfer.

* I think the importance depends on the situation. Sometimes it is important for there to be restrictions and sometimes not.

* It is important for 'free, open source' software to be available to use because of the following reasons:
1. Large number of people have the access of this software.
2. It becomes so cheap and it's help is easily available with different suggestions.
3. It is much compatible with other softwares.

* No, nothing is free. If something is shown free, it's because they are targeting to register large number of users world wide on this platform and for this they keep the basic facilities free of cost because the software is on developing stage. When we register with paid version then we are able to use all it's properties we want.

j. Saleem is working on a documentary about different kinds of birds and their sounds. How will the following options in Audacity help with this fascinating and informative documentary? What other properties could be used? Why?
* mixing narration with background music
* having multiple tracks in one project
* adding effects such as 'Fade in' and the silence generator
Answer: 1. By mixing narration with the background music gives so pleasing listening effect because chosen the music carefully can add to the mood of the narration.
2. Having multiple tracks in one project will allow dramas and movies to add sound effect like the thrilling sound of lion, playing music and dialogues in different scenes.
3. By using the effect 'Fade in' helps to avoid abrupt transitions, while the 'silence generator' helps to cut out unwanted words or language.

Additional Questions
Q: What are the common uses of Audacity software?
Answer: The common uses of Audacity software are:
1. Playing back music or sound.
2. Noise removal.
3. Piece of background music to sync it with video.
4. Removing or adding tracks.
5. Changing the speed of a narration.
6. Multitrack mixing.

Q: Why we use Device Toolbar?
Answer: Following are the reasons that why we use Device Toolbar:
1. To select Audio host.
2. To select Input device.
3. To select Output device.
4. To select Input channels.

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