PoojaMoolya at 09:20, 8 April 2019

2019-04-08T09:20:26Z

PoojaMoolya at 09:12, 8 April 2019

2019-04-08T09:12:54Z

Pratik kamble at 07:31, 8 April 2019

2019-04-08T07:31:41Z

PoojaMoolya at 10:13, 5 April 2019

2019-04-05T10:13:18Z

Pratik kamble: Created page with "{| Border = 1 | '''Time''' |'''Narration''' |- |00:01 |Dear Friends,Welcome to the spoken tutorial on “'''Signal Processing using Scilab'''” |- | 00:07 | In this tutoria..."

2016-10-26T07:07:36Z

Created page with "{| Border = 1 | '''Time''' |'''Narration''' |- |00:01 |Dear Friends,Welcome to the spoken tutorial on “'''Signal Processing using Scilab'''” |- | 00:07 | In this tutoria..."

New page

{| Border = 1
| '''Time'''
|'''Narration'''

|-
|00:01
|Dear Friends,Welcome to the spoken tutorial on “'''Signal Processing using Scilab'''”

|-
| 00:07
| In this tutorial, using Scilab, I will show you how to Generate different kinds of signals , and Perform different operations to analyse signals.

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| 00:19
| To record this tutorial, I am using '''Ubuntu 11.04''' as the operating system with '''Scilab 5.3.3''' version

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| 00:30
| Before practicing this tutorial, a learner should have a basic knowledge of Scilab.

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|00:35
|To know the basics of Scilab, please refer to the series of basic level of spoken tutorials in Scilab

|-
|00:42
|which is available on our website www.spoken-tutorial.org

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| 00:45
|In this tutorial, I will describe about 3 basic Signals.Plotting continuous and discrete sine wave.Plotting '''step function'''. Plotting '''ramp function'''.

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|00:58
|Let me start with “Plotting continuous and discrete sine wave”

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| 01:02
| Let us switch to the Scilab Console Window.

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|01:06
|Here type: '''t equal to zero colon zero point one colon two multiplied by precentage pi semicolon.'''

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|01:17
|Then '''x equal to sin of t semicolon then plot 2D into bracket t comma x'''and press '''Enter''' key on your keyboard.

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| 01:33
| This is a '''continous sine wave'''

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| 01:36
| Let us discuss the '''discrete sine wave.'''

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|01:39
|On the console window type: '''plot two d3 within bracket invertes comma gnn comma t comma x and press Enter.'''

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|01:54
| This is '''discrete sine wave.'''

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| 01:57
| Let us now discuss about Plotting '''step function''' and plotting '''ramp function.'''

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| 02:04
|I have already written the code to generate '''step''' and '''ramp''' signal in the file called '''signals.sce.'''

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|02:14
|Let us open this file '''signal.sce''' using '''scilab editor'''.Let us execute this code.Click on the “Execute” button in the Menu bar

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| 02:27
| '''Step''' and '''Ramp''' signal is displayed in this plot.

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| 02:32
| Now let us learn how to perform different operations to analyse signals.Let us see how to perform '''Convolution''' between two signals.

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| 02:43
| Let us switch to the Scilab Console window and type'''x equals to within square bracket one comma two comma three comma four'''

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|02:55
|Then type '''h equals to within square bracket one comma one comma one'''

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|03:04
|Now let us apply the '''convolution''' by typing''' convol opening bracket x comma h closing bracket''' and press Enter on your keyboard.

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| 03:17
| An output can be seen here.

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| 03:20
| Now let us learn '''Discrete fourier transform''' for a discrete sequence by using the inbuilt command '''dft().'''

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| 03:30
| On the console window here type '''x equals to within square bracket one comma two comma three comma four'''

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|03:41
|ThenType''' within square bracket xf equals to dft into bracket x comma minus 1'''Where x is the input vector and flag value is -1 for DFT.

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|03:59
|Let us press Enter

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| 04:01
|The output appears as this
'''10. '''
'''- 2. + 2.i '''
'''- 2. - 9.797D-16i '''
'''- 2. - 2.i '''

|-
| 04:05
| Now I will show you how to calculate inverse discrete '''fourier transform'''. This can be done by using the same inbuilt command '''dft().'''

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| 04:15
| On the Scilab console window type: '''squareBracket x equals to dft within bracket xf comma 1'''Here the '''flag value''' is 1 for '''idft.'''

|-
| 04:31
|This is the output
''' + 5.551D-17i '''
''' - 1.225D-16i '''
''' - 5.551D-16i'''

|-
| 04:34
| Let us calculate discrete fourier transform using '''fft()'''

|-
|04:39
| On the console window, type '''x= square [1,2,3,4]x equals to square bracket one comma two comma three comma four'''

|-
|04:49
|Press Enter and type '''y = fft(x,-1)''' y equals to fft within bracket x comma minus one

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|04:59
|Press Enter and you can see the output as these:-'''10. - 2. + 2.i - 2. - 2. - 2.i '''

|-
| 05:05
| Let us now see how to calculate inverse discrete fourier transform by using '''fft().'''

|-
|05:12
|On the Scilab console window type '''y equals to within square bracket ten comma minus two plus two into percentage i comma minus two comma minus two minus two into percentage i.'''

|-
|05:33
|and Press EnterType '''x fft(y,1)''' x equals to fft within bracket y comma 1 and Press Enter

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| 05:45
| The output will be displayed as '''x =1. 2. 3. 4.'''

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| 05:49
| Let us now find out the correlation between two vectors.

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| 05:53
| To do this on the Scilab console window,

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|05:56
|Type '''x one equals to within square bracket one comma two comma three comma four'''and press Enter

|-
|06:08
|Type''' x2 equals to within square braccket one comma three comma one comma five '''and press Enter

|-
|06:20
|Type '''R x one x two equals to corr within bracket x one comma x two comma four '''and press Enter

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|06:34
|The output will be displayed as '''Rx1x2=1.25 0.3125 0.25 - 0.9375'''

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| 06:38
| Let us learn how to sample the given signal

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| 06:42
| Let me open sampling.sce where I have already written the code in sampling.sce .Here click on the “'''Execute'''”button.

|-
|06:52
|A plot is displayed.

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| 06:56
| Let us summarise.

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| 06:58
| In this tutorial we have learnt How to Plot sine, step and ramp signal.

|-
|07:04
|To perform Linear convolution by convol().To perform DFT and IDFT by dft().

|-
|07:12
|To perform FFT by fft().To find out the Correlation by corr().To do sampling

|-
| 07:20
| Watch the video available atthis URL http://spoken-tutorial.org/What is a Spoken Tutorial

|-
|07:23
|It summarises the Spoken TutorialprojectIf you do not have goodbandwidth, you can also download and watch it

|-
|07:30
| The Spoken Tutorial Project Team Conducts workshops using spokentutorials. Gives certificates to those who pass an online test Please contact us contact@spoken-tutorial.org

|-
|07:42
| Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education throughICT, MHRD, Government of India

|-
| 07:51
| This script has been contributed by Manas and this is Sheetal Prabhu signing off. Thank you for joining.

|}

@@ Line 180: / Line 180: @@
 |-
 |05:56
-|Type '''x one equals to within square bracket one comma two comma three comma four'''and press Enter
+|Type '''x equals to within square bracket one comma two comma three comma four'''and press Enter
 |-

@@ Line 141: / Line 141: @@
 |-
 |04:39
-| On the console window, type '''x= square [1,2,3,4]x equals to square bracket one comma two comma three comma four'''
+| On the console window, type '''x= x equals to square bracket one comma two comma three comma four'''
 |-
 |04:49
-|Press Enter and type '''y = fft(x,-1)''' y equals to fft within bracket x comma minus one
+|Press Enter and type  y equals to fft within bracket x comma minus one
 |-
@@ Line 161: / Line 161: @@
 |-
 |05:33
-|and Press EnterType '''x  fft(y,1)''' x equals to fft within bracket y comma 1 and Press Enter
+|and Press EnterType  x equals to fft within bracket y comma 1 and Press Enter
 |-
 | 05:45
-| The output will be displayed as '''x =1. 2. 3. 4.'''
+| The output will be displayed as this
-−
 |-
 | 05:49
@@ Line 217: / Line 216: @@
 |-
 |07:12
-|To perform FFT by fft().To find out the Correlation by corr().To do sampling
+|To perform FFT by fft(). To find out the Correlation by corr(). To do sampling
 |-

@@ Line 134: / Line 134: @@
 | 04:31
 |This is the output
 |-

@@ Line 188: / Line 188: @@
 |-
 |06:20
-|Type '''R x one x two equals to corr within bracket x one comma x two comma four '''and press Enter
+|Type '''R x  x two equals to corr within bracket x comma x two comma four '''and press Enter
 |-
 |06:34
-|The output will be displayed as '''Rx1x2=1.25 0.3125 0.25 - 0.9375'''
+|The output will be displayed as shown.
 |-

Scilab/C4/Digital-Signal-Processing/English-timed - Revision history

PoojaMoolya at 09:20, 8 April 2019

PoojaMoolya at 09:12, 8 April 2019

Pratik kamble at 07:31, 8 April 2019

PoojaMoolya at 10:13, 5 April 2019

Pratik kamble: Created page with "{| Border = 1 | '''Time''' |'''Narration''' |- |00:01 |Dear Friends,Welcome to the spoken tutorial on “'''Signal Processing using Scilab'''” |- | 00:07 | In this tutoria..."