Difference between revisions of "ExpEYES/C2/Characteristics-of-Sound-Waves/English"

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* '''ExpEYES''' v 3.1.0
 
* '''ExpEYES''' v 3.1.0
  
−
* '''Ubuntu Linux''' OS v. 14.10.
+
* '''Ubuntu Linux''' OS v 14.10.
 
|| Here I am using,
 
|| Here I am using,
  
Line 85: Line 85:
 
'''Definition of Sound'''.
 
'''Definition of Sound'''.
  
−
'''Sound''' is a vibration that propagates  
+
'''Sound''' is a vibration that propagates as audible mechanical wave of pressure & displacement.
−
*as an audible mechanical wave of pressure and displacement,
+
 
−
*through a medium.
+
It requires a medium to propagate.
−
* Eg; Air, water or metal surface.
+
 
 +
Air, water or metal surface.
 
|| Let's first begin with definition of Sound.
 
|| Let's first begin with definition of Sound.
  
−
'''Sound''' is a vibration that propagates  
+
'''Sound''' is a vibration that propagates as an audible mechanical wave of pressure & displacement.
−
*as an audible mechanical wave of pressure and displacement,
+
 
−
*through a medium.
+
It requires a medium to propagate.
−
*The medium can be air, water or any metal surface.
+
 
 +
The medium can be air, water or any metal surface.
 
|-
 
|-
 
|| '''Slide Number 7'''
 
|| '''Slide Number 7'''
  
−
'''Characteristics of sound.'''
+
'''Characteristics of sound'''
  
 
Carry out various experiments to show characteristics of sound waves.
 
Carry out various experiments to show characteristics of sound waves.
Line 105: Line 107:
 
|| '''Slide Number 8'''
 
|| '''Slide Number 8'''
  
−
'''Frequency of sound'''.
+
'''Frequency of sound'''
  
−
Experiment to show frequency of sound waves.
+
Experiment to show frequency of sound.
 
|| Let's perform an experiment to show frequency of sound waves.
 
|| Let's perform an experiment to show frequency of sound waves.
 
|-
 
|-
 
||Show the circuit diagram.
 
||Show the circuit diagram.
−
|| In this experiment, ground('''GND''') is connected to '''Piezo buzzer'''('''PIEZO''').
+
|| In this experiment, ground('''GND''') is connected to '''Piezo buzzer(PIEZO)'''.
  
 
'''Piezo buzzer(PIEZO)''' is connected to '''SQR1'''.
 
'''Piezo buzzer(PIEZO)''' is connected to '''SQR1'''.
Line 124: Line 126:
 
|| Let's see the result on the '''Plot window'''.
 
|| Let's see the result on the '''Plot window'''.
 
|-
 
|-
−
|| Point to '''Setting Square waves''' set frequency as ''3500Hz''.  
+
||Point to '''Setting Square waves''', set frequency as ''3500Hz''.  
−
|| On the '''Plot window''', under '''Setting Square waves, '''set the frequency as ''3500Hz''.  
+
||On the '''Plot window''', under '''Setting Square waves, '''set the frequency as ''3500Hz''.  
 
|-
 
|-
 
|| Click on '''SQR1''' check box.
 
|| Click on '''SQR1''' check box.
Line 136: Line 138:
 
Frequency of '''SQR1''' is set to ''3500Hz''.  
 
Frequency of '''SQR1''' is set to ''3500Hz''.  
  
−
A digitised sound wave is generated.
+
A digitized sound wave is generated.
 
|-
 
|-
−
|| Move the frequency slider.
+
|| Move the '''frequency''' slider.
−
|| Move the frequency slider to change the waveform.
+
|| Move the '''frequency''' slider to change the waveform.
 
|-
 
|-
−
|| Click on '''SQ1''' drag to''' CH2'''.
+
|| Click on '''SQ1''', drag to''' CH2'''.
  
 
Point to the assigned data.
 
Point to the assigned data.
Line 153: Line 155:
 
|-
 
|-
 
|| Drag the '''mSec/div''' slider.
 
|| Drag the '''mSec/div''' slider.
−
|| Drag the '''mSec/div''' slider to set in proper '''compressions''' and '''rear-fractions'''.
+
|| Drag the '''mSec/div''' slider to set in '''compressions''' and '''rarefactions'''.
 
|-
 
|-
 
|| Click on '''CH2''', drag to '''FIT'''.
 
|| Click on '''CH2''', drag to '''FIT'''.
Line 160: Line 162:
 
|| Click on '''CH2 '''and drag to '''FIT'''.
 
|| Click on '''CH2 '''and drag to '''FIT'''.
  
−
Voltage and frequency of '''SQ1''' is displayed on the rightside.
+
Voltage and frequency of '''SQ1''' is displayed on the right-side.
 
|-
 
|-
−
|| Move the frequency slider.
+
|| Move the '''frequency''' slider.
−
|| Move the frequency slider to set in '''sound waves'''
+
|| Move the '''frequency''' slider to set in '''sound waves'''
 
|-
 
|-
 
|| Point to the sound wave.
 
|| Point to the sound wave.
  
−
Point to the''' amplitutde'''.
+
Point to the''' amplitude'''.
 
|| Sound wave produced by the '''Piezo buzzer''' is shown in black colour.
 
|| Sound wave produced by the '''Piezo buzzer''' is shown in black colour.
  
−
'''Amplitude''' of the wave changes as '''Piezo buzzer''' is moved closer and away from the '''MIC'''.  
+
'''Amplitude''' of the wave changes as '''Piezo buzzer''' is moved closer and away from the '''MIC''' respectively.  
 
|-
 
|-
 
|| '''Slide Number 9'''
 
|| '''Slide Number 9'''
Line 200: Line 202:
 
|| Point to '''Frequency response''' of the '''Piezo buzzer'''.
 
|| Point to '''Frequency response''' of the '''Piezo buzzer'''.
  
−
Point to the '''amplitide'''.  
+
Point to the '''amplitude'''.  
 
|| '''Frequency response''' of the '''Piezo buzzer''' is set in.
 
|| '''Frequency response''' of the '''Piezo buzzer''' is set in.
  
 
'''Frequency response''' has maximum '''amplitude''' at ''3700Hz''.  
 
'''Frequency response''' has maximum '''amplitude''' at ''3700Hz''.  
 
|-
 
|-
−
|| click on '''Grace''' button.
+
|| Click on '''Grace''' button.
  
 
Point to the '''Grace''' window '''Frequency response Curve'''
 
Point to the '''Grace''' window '''Frequency response Curve'''
Line 232: Line 234:
 
|| Point to the new windows.
 
|| Point to the new windows.
  
−
Point to the circuit daigram on '''Schematic''' window.  
+
Point to the circuit diagram on '''Schematic''' window.  
 
|| Two new windows '''EYES Junior: Velocity of Sound''' and '''Schematic''' open.
 
|| Two new windows '''EYES Junior: Velocity of Sound''' and '''Schematic''' open.
  
Line 248: Line 250:
 
||'''Slide Number 11'''
 
||'''Slide Number 11'''
  
−
From the various '''Phase''' values we will use ''178deg'' and ''106deg'' to calculate velocity of sound
+
'''Measure Phase'''
 +
 
 +
Various '''Phase''' values we will use, ''178deg'' & ''106deg'' to calculate velocity of sound.
 
||From the various '''Phase''' values we will use ''178deg'' and ''106deg'' to calculate velocity of sound.
 
||From the various '''Phase''' values we will use ''178deg'' and ''106deg'' to calculate velocity of sound.
 
|-
 
|-
 
||'''Slide Number 12'''
 
||'''Slide Number 12'''
−
These values can be obtained when '''Piezo buzzer''' is kept close to the '''MIC''' and ''2cm'' away from the '''MIC'''
+
 
−
||These values can be obtained when '''Piezo buzzer''' is kept close to the '''MIC''' and ''2cm'' away from the '''MIC''' respectively.
+
'''Measure Phase'''
 +
We can obtain these values when '''Piezo''' is kept close & ''2cm'' away from '''MIC'''.
 +
||We can obtain these values when '''Piezo ''' is kept close and ''2cm'' away from the '''MIC'''.  
 
|-
 
|-
 
||'''Slide Number 13'''
 
||'''Slide Number 13'''
Line 259: Line 265:
 
'''Note'''
 
'''Note'''
  
−
Ensure that '''MIC''' and '''Piezo''' are placed on the same axis.
+
Ensure that '''MIC''' and '''Piezo buzzer''' are placed on the same axis.
−
|| To obtain accurate results, ensure that '''MIC''' and '''Piezo''' are placed on the same axis.  
+
|| To obtain accurate results, ensure that '''MIC''' and '''Piezo buzzer''' are placed on the same axis.  
 
|-
 
|-
 
|| '''Slide Number 14'''
 
|| '''Slide Number 14'''
Line 273: Line 279:
  
 
''v=350m/sec''  
 
''v=350m/sec''  
−
|| To calculate the value of velocity of sound, we have the formula as shown:
+
|| To calculate the value of '''velocity of sound''',
 +
 
 +
we have the formula as shown:
  
 
Velocity of sound obtained from the experiment is “350m/sec”.
 
Velocity of sound obtained from the experiment is “350m/sec”.
Line 291: Line 299:
 
|-
 
|-
 
||'''Slide Number 16'''
 
||'''Slide Number 16'''
 +
 +
'''Sound Waves'''
  
 
* Interference
 
* Interference
Line 311: Line 321:
 
||'''Slide Number 17'''
 
||'''Slide Number 17'''
  
−
Grace plots
+
'''Grace plots'''
  
 
* python-imaging-tk
 
* python-imaging-tk
Line 318: Line 328:
  
 
* scipy  
 
* scipy  
 +
 
* python-pygrace.  
 
* python-pygrace.  
 
|| To show '''Grace''' plots in the experiments:
 
|| To show '''Grace''' plots in the experiments:
Line 332: Line 343:
 
|-
 
|-
 
|| Show the picture.
 
|| Show the picture.
−
|| In this experiment we use two '''Piezo buzzers ''' as source of sound.
+
|| In this experiment we use two '''Piezo buzzers''' as source of sound.
 
|-
 
|-
 
|| Point to the circuit diagram.
 
|| Point to the circuit diagram.
−
|| In this experiment '''Piezo1''' is connected to '''SQR1''' and ground'''(GND)'''.
+
|| In this experiment '''Piezo 1''' is connected to '''SQR1''' and ground'''(GND)'''.
  
−
'''Piezo2''' is connected to '''SQR2''' and ground'''(GND)'''.
+
'''Piezo 2''' is connected to '''SQR2''' and ground'''(GND)'''.
  
 
This is the circuit diagram.
 
This is the circuit diagram.
Line 356: Line 367:
 
Frequency of '''SQR1 '''and''' SQR2''' is set to “3500Hz”.  
 
Frequency of '''SQR1 '''and''' SQR2''' is set to “3500Hz”.  
  
−
A digitised sound wave is generated.
+
A digitized sound wave is generated.
 
|-
 
|-
−
|| Click on '''Experiments ''' button, '''Interference of Sound'''.
+
||Move the '''frequency''' slider.
 +
||Move the '''frequency''' slider to change the waveform.
 +
|-
 +
|| Click on '''EXPERIMENTS''' button, '''Interference of Sound'''.
  
 
Point to '''EYES: Interference of Sound''' window.
 
Point to '''EYES: Interference of Sound''' window.
Line 374: Line 388:
 
|| Click on '''SQR1''' and '''SQR2''' check boxes.
 
|| Click on '''SQR1''' and '''SQR2''' check boxes.
  
−
Click on '''START''' button, '''Interference''' pattern is seen.  
+
Click on '''START''' button.
 +
 
 +
'''Interference''' pattern is seen.  
 
|-
 
|-
 
|| Click on '''Xmgrace''' button.
 
|| Click on '''Xmgrace''' button.
  
 
Point to the '''Grace''' pattern.
 
Point to the '''Grace''' pattern.
−
|| Now click on '''Xmgrace''' button.
+
||Now click on '''Xmgrace''' button.
  
 
A new window opens with a '''Grace''' pattern.
 
A new window opens with a '''Grace''' pattern.
Line 386: Line 402:
 
|| Now we will show '''Beats''' pattern.
 
|| Now we will show '''Beats''' pattern.
 
|-
 
|-
−
|| Click on '''Experiments '''button, select '''Interference of Sound'''.
+
|| Click on '''EXPERIMENTS '''button, select '''Interference of Sound'''.
  
 
Point to '''EYES: Interference of Sound''' window.
 
Point to '''EYES: Interference of Sound''' window.
−
|| Click on '''Experiments''' button and select '''Interference of Sound'''.
+
|| Click on '''EXPERIMENTS''' button and select '''Interference of Sound'''.
  
 
'''EYES: Interference of Sound''' window opens.
 
'''EYES: Interference of Sound''' window opens.
 
|-
 
|-
−
|| Click on SQR1 and SQR2 check boxes.
+
|| Click on '''SQR1 '''and '''SQR2'''check boxes.
 
|| At the bottom of the window, Click on '''SQR1 '''and '''SQR2''' check boxes.
 
|| At the bottom of the window, Click on '''SQR1 '''and '''SQR2''' check boxes.
 
|-
 
|-
Line 405: Line 421:
 
|| click on '''Xmgrace''' button.
 
|| click on '''Xmgrace''' button.
  
 +
Point to the Grace pattern.
 
|| Now click on '''Xmgrace''' button.
 
|| Now click on '''Xmgrace''' button.
  
Line 419: Line 436:
  
 
'''Fourier Transform'''
 
'''Fourier Transform'''
−
Fourier Transform please visit this
 
−
webpage.
 
  
−
'''https://en.wikipedia.org/wiki/Fourier_transform.'''
+
Fourier Transform please visit this webpage.
−
|| To know more about '''Fourier Transform ''' please visit this website.
+
 
 +
'''https://en.wikipedia.org/wiki/Fourier_transform'''
 +
|| To know more about '''Fourier Transform ''' please visit this webpage.
  
 
'''https://en.wikipedia.org/wiki/Fourier_transform'''.
 
'''https://en.wikipedia.org/wiki/Fourier_transform'''.
Line 436: Line 453:
 
This is the circuit diagram.
 
This is the circuit diagram.
 
|-
 
|-
−
|| Click on '''Experiments''' button select '''Interference of Sound'''.
+
|| Click on '''EXPERIMENTS ''' button select '''Interference of Sound'''.
  
 
Point to '''EYES: Interference of Sound''' window.
 
Point to '''EYES: Interference of Sound''' window.
Line 443: Line 460:
 
'''EYES: Interference of Sound''' window opens.
 
'''EYES: Interference of Sound''' window opens.
 
|-
 
|-
−
|| Set the value of '''SQR1'' to ''100'', check the box.
+
|| Set the value of '''SQR1''' to ''100'', check the box.
 
|| At the bottom of the window, set the value of '''SQR1''' to ''100'' and check the box.
 
|| At the bottom of the window, set the value of '''SQR1''' to ''100'' and check the box.
 
|-
 
|-
Line 449: Line 466:
  
 
Point to the wave.
 
Point to the wave.
−
|| Click on '''START''' button, a low '''amplitute''' wave is displayed.
+
|| Click on '''START''' button, a low '''amplitude''' wave is displayed.
 
|-
 
|-
 
|| Click on '''FFT'''.
 
|| Click on '''FFT'''.
Line 460: Line 477:
  
 
'''Summary'''
 
'''Summary'''
−
|| In this tutorial, we have learnt to demonstrate:
+
 
 +
* How to generate a sound wave
 +
 
 +
* Frequency response of a sound source
 +
 
 +
* How to calculate velocity of sound
 +
 
 +
* Interference and Beat pattern of sound waves
 +
 
 +
* Forced oscillations of sound source.
 +
 
 +
* Xmgrace plots
 +
 
 +
* Fourier Transforms
 +
 
 +
* Circuit diagrams
 +
|| In this tutorials we have learnt to demonstrate:
  
 
* How to generate a sound wave
 
* How to generate a sound wave
Line 470: Line 503:
 
* Interference and Beat pattern of sound waves  
 
* Interference and Beat pattern of sound waves  
  
−
* Forced oscillations of sound source  
+
* Forced oscillations of sound source.
  
 
And have shown:
 
And have shown:
Line 484: Line 517:
 
'''Assignment'''
 
'''Assignment'''
  
 +
1. Capture a sound burst
 +
 +
2. Hint: A bell or a clap can be used as
 +
source of sound
 
|| As an Assignment,  
 
|| As an Assignment,  
  
−
* Capture a sound burst  
+
1. Capture a sound burst  
  
−
* Hint: A bell or a clap can be used as source of sound.  
+
2. Hint: A bell or a clap can be used as source of sound.  
  
−
This is the circuit dagram.
+
This is the circuit diagram.
 
|-
 
|-
 
|| '''Slide Number 23'''
 
|| '''Slide Number 23'''
Line 500: Line 537:
 
'''http://spoken-tutorial.org/What is a Spoken Tutorial'''.  
 
'''http://spoken-tutorial.org/What is a Spoken Tutorial'''.  
  
−
It summarises the Spoken Tutorial project.  
+
It summarizes the Spoken Tutorial project.  
  
 
If you do not have good bandwidth,  
 
If you do not have good bandwidth,  
  
 
you can download and watch it.
 
you can download and watch it.
−
|| * This video summarises the Spoken Tutorial project
+
|| * This video summarizes the Spoken Tutorial project
  
 
* If you do not have good bandwidth, you can download and watch it.
 
* If you do not have good bandwidth, you can download and watch it.

Latest revision as of 11:17, 18 October 2016

Visual Cue Narration
Slide Number 1

Title Slide

Hello everyone.

Welcome to this tutorial on Characteristics of Sound Waves.

Slide Number 2+3

Learning Objectives

  • How to generate a sound wave
  • Frequency response of a sound source
  • How to calculate velocity of sound
  • Interference & Beats of sound waves
  • Forced oscillations of sound source

Show

  • Xmgrace plots
  • Fourier Transforms
  • Circuit diagrams
In this tutorial we will learn to demonstrate:
  • How to generate a sound wave
  • Frequency response of a sound source
  • How to calculate velocity of sound
  • Interference and Beats of sound waves
  • Forced oscillations of a sound source.

And Show

  • Xmgrace plots
  • Fourier Transforms and
  • Circuit diagrams for our experiments.
Slide Number 4

System Requirement

  • ExpEYES v 3.1.0
  • Ubuntu Linux OS v 14.10.
Here I am using,
  • ExpEYES version 3.1.0
  • Ubuntu Linux OS version 14.10
Slide Number 5

Pre-requisties

You should be familiar with:

ExpEYES interface.

For relevant tutorials, visit our website.

www.spoken-tutorial.org.

To follow this tutorial, you should be familiar with:

ExpEYES Junior interface.

If not, for relevant tutorials, please visit our website.

Slide Number 6

Definition of Sound.

Sound is a vibration that propagates as audible mechanical wave of pressure & displacement.

It requires a medium to propagate.

Air, water or metal surface.

Let's first begin with definition of Sound.

Sound is a vibration that propagates as an audible mechanical wave of pressure & displacement.

It requires a medium to propagate.

The medium can be air, water or any metal surface.

Slide Number 7

Characteristics of sound

Carry out various experiments to show characteristics of sound waves.

In this tutorial we will carry out various experiments to show characteristics of sound waves.
Slide Number 8

Frequency of sound

Experiment to show frequency of sound.

Let's perform an experiment to show frequency of sound waves.
Show the circuit diagram. In this experiment, ground(GND) is connected to Piezo buzzer(PIEZO).

Piezo buzzer(PIEZO) is connected to SQR1.

Microphone(MIC) is connected to A1.

Here Piezo buzzer(PIEZO) is a source of sound.

This is the circuit diagram.

Let's see the result on the Plot window.
Point to Setting Square waves, set frequency as 3500Hz. On the Plot window, under Setting Square waves, set the frequency as 3500Hz.
Click on SQR1 check box.

Point to SQR1 check box.

Point to the sound wave.

Click on SQR1 check box.

Frequency of SQR1 is set to 3500Hz.

A digitized sound wave is generated.

Move the frequency slider. Move the frequency slider to change the waveform.
Click on SQ1, drag to CH2.

Point to the assigned data.

Point to the square wave.

Click on SQ1 and drag to CH2.

Input data of SQ1 is assigned to CH2.

A square wave is generated.

Drag the mSec/div slider. Drag the mSec/div slider to set in compressions and rarefactions.
Click on CH2, drag to FIT.

Point to voltage and frequency of SQ1.

Click on CH2 and drag to FIT.

Voltage and frequency of SQ1 is displayed on the right-side.

Move the frequency slider. Move the frequency slider to set in sound waves
Point to the sound wave.

Point to the amplitude.

Sound wave produced by the Piezo buzzer is shown in black colour.

Amplitude of the wave changes as Piezo buzzer is moved closer and away from the MIC respectively.

Slide Number 9

Frequency response

Demonstrate frequency response of Piezo buzzer.

Now we will demonstrate frequency response of Piezo buzzer.
Click on EXPERIMENTS button.

Select Experiment list opens, Click on Frequency Response.

On the Plot window click on EXPERIMENTS button.

Select Experiment list opens.

Click on Frequency Response from the list.

Point to two new windows.

Point to the circuit diagram

Two new windows Audio Frequency response Curve and Schematic open.

Schematic window shows, circuit diagram of the experiment.

Point to Audio Frequency response Curve window, click on START button. On the Audio Frequency response Curve window click on START button.
Point to Frequency response of the Piezo buzzer.

Point to the amplitude.

Frequency response of the Piezo buzzer is set in.

Frequency response has maximum amplitude at 3700Hz.

Click on Grace button.

Point to the Grace window Frequency response Curve

On the same window click on Grace button.

Grace window opens showing Frequency response Curve

Slide Number 10

Velocity of Sound

Measure velocity of the source of sound.

Now we will measure velocity of the source of sound.
Click on EXPERIMENTS button.

Point to the list.

Click on Velocity of Sound.

On the Plot window click on EXPERIMENTS button.

Select Experiment list opens.

Click on Velocity of Sound from the list.

Point to the new windows.

Point to the circuit diagram on Schematic window.

Two new windows EYES Junior: Velocity of Sound and Schematic open.

Schematic window shows the circuit diagram of the experiment.

Click on Measure Phase button. On EYES Junior: Velocity of Sound window click on Measure Phase button.
Move the Piezo buzzer to different distances. We can obtain different Phase values by changing the distance between MIC and Piezo buzzer.
Click on Measure Phasebutton. Click Measure Phase button to obtain different Phase values.
Slide Number 11

Measure Phase

Various Phase values we will use, 178deg & 106deg to calculate velocity of sound.

From the various Phase values we will use 178deg and 106deg to calculate velocity of sound.
Slide Number 12

Measure Phase We can obtain these values when Piezo is kept close & 2cm away from MIC.

We can obtain these values when Piezo is kept close and 2cm away from the MIC.
Slide Number 13

Note

Ensure that MIC and Piezo buzzer are placed on the same axis.

To obtain accurate results, ensure that MIC and Piezo buzzer are placed on the same axis.
Slide Number 14

Velocity of sound.

v=f *(360 * ∆D/X)

v= 3500(360*2/(178-106)

v=35000cm/sec

v=350m/sec

To calculate the value of velocity of sound,

we have the formula as shown:

Velocity of sound obtained from the experiment is “350m/sec”.

Slide Number 15

Assignment

As an assignment,

  • Calculate the value of wavelength of sound.
  • Formula: λ= v/f.
As an assignment, calculate the value of wavelength of sound.

Formula: λ= v/f.

Slide Number 16

Sound Waves

  • Interference
  • Beats
  • Xmgrace plot
  • Fourier Transform.
Now we will demonstrate:
  • Interference
  • Beats
  • Xmgrace plot and
  • Fourier Transform of the two sources of sound.
Slide Number 17

Grace plots

  • python-imaging-tk
  • grace
  • scipy
  • python-pygrace.
To show Grace plots in the experiments:

Make sure that you have installed

  • python-imaging-tk
  • grace
  • scipy and
  • python-pygrace on your system.
Show the picture. In this experiment we use two Piezo buzzers as source of sound.
Point to the circuit diagram. In this experiment Piezo 1 is connected to SQR1 and ground(GND).

Piezo 2 is connected to SQR2 and ground(GND).

This is the circuit diagram.

Let's see the result on the Plot window.
Set the value of SQR1 as 3500Hz. On the Plot window, set frequency as 3500Hz.
Click on SQR1 and SQR2 check boxes.

Point to the check boxes.

Point to the sound wave.

Click on SQR1 and SQR2 check boxes.

Frequency of SQR1 and SQR2 is set to “3500Hz”.

A digitized sound wave is generated.

Move the frequency slider. Move the frequency slider to change the waveform.
Click on EXPERIMENTS button, Interference of Sound.

Point to EYES: Interference of Sound window.

Click on EXPERIMENTS button and select Interference of Sound.

EYES: Interference of Sound window opens.

Change NS value to 1000. At the bottom of the window, change NS that is number of samples value to 1000.
Click on SQR1, SQR2 check boxes.

Click on START button.

Click on SQR1 and SQR2 check boxes.

Click on START button.

Interference pattern is seen.

Click on Xmgrace button.

Point to the Grace pattern.

Now click on Xmgrace button.

A new window opens with a Grace pattern.

Now we will show Beats pattern.
Click on EXPERIMENTS button, select Interference of Sound.

Point to EYES: Interference of Sound window.

Click on EXPERIMENTS button and select Interference of Sound.

EYES: Interference of Sound window opens.

Click on SQR1 and SQR2check boxes. At the bottom of the window, Click on SQR1 and SQR2 check boxes.
Click onSTART button.

Point to Beats pattern.

Click on START button.

Beats pattern appears.

click on Xmgrace button.

Point to the Grace pattern.

Now click on Xmgrace button.

A new window opens with a Grace pattern.

Click on FFT.

Point to Fourier Transform.

Click on FFT.

A new window opens with Fourier Transform.

Slide Number 19

Fourier Transform

Fourier Transform please visit this webpage.

https://en.wikipedia.org/wiki/Fourier_transform

To know more about Fourier Transform please visit this webpage.

https://en.wikipedia.org/wiki/Fourier_transform.

Slide Number 20

Low Frequency Sound Wave

To show a low frequency sound wave.

Let us perform an experiment to show a low frequency sound wave.

This is the circuit diagram.

Click on EXPERIMENTS button select Interference of Sound.

Point to EYES: Interference of Sound window.

Click on EXPERIMENTS button and select Interference of Sound.

EYES: Interference of Sound window opens.

Set the value of SQR1 to 100, check the box. At the bottom of the window, set the value of SQR1 to 100 and check the box.
Click on START button.

Point to the wave.

Click on START button, a low amplitude wave is displayed.
Click on FFT. Click on FFT to obtain a Grace plot of Fourier Transform.
Let's summarize.
Slide Number 21

Summary

  • How to generate a sound wave
  • Frequency response of a sound source
  • How to calculate velocity of sound
  • Interference and Beat pattern of sound waves
  • Forced oscillations of sound source.
  • Xmgrace plots
  • Fourier Transforms
  • Circuit diagrams
In this tutorials we have learnt to demonstrate:
  • How to generate a sound wave
  • Frequency response of a sound source
  • How to calculate velocity of sound waves
  • Interference and Beat pattern of sound waves
  • Forced oscillations of sound source.

And have shown:

  • Xmgrace plots
  • Fourier Transforms and
  • Circuit diagrams for our experiments.
Slide Number 22

Assignment

1. Capture a sound burst

2. Hint: A bell or a clap can be used as source of sound

As an Assignment,

1. Capture a sound burst

2. Hint: A bell or a clap can be used as source of sound.

This is the circuit diagram.

Slide Number 23

Acknowledgement

Watch the video available at

http://spoken-tutorial.org/What is a Spoken Tutorial.

It summarizes the Spoken Tutorial project.

If you do not have good bandwidth,

you can download and watch it.

* This video summarizes the Spoken Tutorial project
  • If you do not have good bandwidth, you can download and watch it.
Slide Number 24

The Spoken Tutorial Project Team,

Conducts workshops using spoken tutorials.

Gives certificates to those who pass an online test.

For more details, please write to

contact@spoken-tutorial.org

* We conduct workshops using Spoken Tutorials and give certificates.
  • Please contact us.
Slide number 25

Spoken Tutorial Project is a part of the Talk to a Teacher project.

It is supported by the National Mission on Education through ICT,

MHRD, Government of India

More information on this Mission is available at,

http://spoken-tutorial.org/NMEICT-Intro.

The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India.
This tutorial is contributed by Kaushik Datta and Madhuri Ganapathi.

This is Sakina Sidhwa. Thank you for joining.

Contributors and Content Editors

Madhurig, Nancyvarkey

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