Difference between revisions of "Scilab/C4/Digital-Signal-Processing/English-timed"
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| − | | On the console window, type '''x= | + | | On the console window, type '''x= x equals to square bracket one comma two comma three comma four''' |
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|04:49 | |04:49 | ||
| − | |Press Enter and type | + | |Press Enter and type y equals to fft within bracket x comma minus one |
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|05:33 | |05:33 | ||
| − | |and Press EnterType | + | |and Press EnterType x equals to fft within bracket y comma 1 and Press Enter |
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| 05:45 | | 05:45 | ||
| − | | The output will be displayed as | + | | The output will be displayed as this |
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|05:56 | |05:56 | ||
| − | |Type '''x | + | |Type '''x equals to within square bracket one comma two comma three comma four'''and press Enter |
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|07:12 | |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 |
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Latest revision as of 14:50, 8 April 2019
| 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. |
| 00:19 | To record this tutorial, I am using Ubuntu 11.04 as the operating system with Scilab 5.3.3 version |
| 00:30 | Before practicing this tutorial, a learner should have a basic knowledge of Scilab. |
| 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 |
| 00:45 | In this tutorial, I will describe about 3 basic Signals.Plotting continuous and discrete sine wave.Plotting step function. Plotting ramp function. |
| 00:58 | Let me start with “Plotting continuous and discrete sine wave” |
| 01:02 | Let us switch to the Scilab Console Window. |
| 01:06 | Here type: t equal to zero colon zero point one colon two multiplied by precentage pi semicolon. |
| 01:17 | Then x equal to sin of t semicolon then plot 2D into bracket t comma xand press Enter key on your keyboard. |
| 01:33 | This is a continous sine wave |
| 01:36 | Let us discuss the discrete sine wave. |
| 01:39 | On the console window type: plot two d3 within bracket invertes comma gnn comma t comma x and press Enter. |
| 01:54 | This is discrete sine wave. |
| 01:57 | Let us now discuss about Plotting step function and plotting ramp function. |
| 02:04 | I have already written the code to generate step and ramp signal in the file called signals.sce. |
| 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 |
| 02:27 | Step and Ramp signal is displayed in this plot. |
| 02:32 | Now let us learn how to perform different operations to analyse signals.Let us see how to perform Convolution between two signals. |
| 02:43 | Let us switch to the Scilab Console window and typex equals to within square bracket one comma two comma three comma four |
| 02:55 | Then type h equals to within square bracket one comma one comma one |
| 03:04 | Now let us apply the convolution by typing convol opening bracket x comma h closing bracket and press Enter on your keyboard. |
| 03:17 | An output can be seen here. |
| 03:20 | Now let us learn Discrete fourier transform for a discrete sequence by using the inbuilt command dft(). |
| 03:30 | On the console window here type x equals to within square bracket one comma two comma three comma four |
| 03:41 | ThenType within square bracket xf equals to dft into bracket x comma minus 1Where x is the input vector and flag value is -1 for DFT. |
| 03:59 | Let us press Enter |
| 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(). |
| 04:15 | On the Scilab console window type: squareBracket x equals to dft within bracket xf comma 1Here the flag value is 1 for idft. |
| 04:31 | This is the output |
| 04:34 | Let us calculate discrete fourier transform using fft() |
| 04:39 | 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 equals to fft within bracket x comma minus one |
| 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 equals to fft within bracket y comma 1 and Press Enter |
| 05:45 | The output will be displayed as this |
| 05:49 | Let us now find out the correlation between two vectors. |
| 05:53 | To do this on the Scilab console window, |
| 05:56 | Type x equals to within square bracket one comma two comma three comma fourand 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 x two equals to corr within bracket x comma x two comma four and press Enter |
| 06:34 | The output will be displayed as shown. |
| 06:38 | Let us learn how to sample the given signal |
| 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. |
| 06:56 | Let us summarise. |
| 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. |
