Rank: 83 based on 779 downloads (last 30 days) and 21 files submitted
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Santhana Raj

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Personal Profile:

https://sites.google.com/site/santhanarajarunachalam/

Professional Interests:
Signal Processing, Condition Monitoring of rotating equipments

 

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Files Posted by Santhana View all
Updated   File Tags Downloads
(last 30 days)
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11 Sep 2014 Motion Estimation and Steganography This program does the Motion Estimation analysis and data hiding Author: Santhana Raj video, motion extimation, data hiding, steganography, video compression, video analysis 37 0
10 Sep 2014 Video Reading Frame by frame Reads the video and saves each frames as a png file Author: Santhana Raj video processing, video, frame 38 0
  • 5.0
5.0 | 1 rating
10 Sep 2014 Intra Prediction Re-Construction of Image in a video frame To perform the Intra prediction reconstruction to get the image of a video frame Author: Santhana Raj h264, h264avc, video encoding, decoding, intraprediction, temporal 15 0
10 Sep 2014 Intra Prediction Construction of Image in a video frame To perform the Intra prediction when an image of a video frame is provided Author: Santhana Raj h264, h264avc, video iencoding, intra prediction 17 0
10 Sep 2014 Interprediction Re-Construction of Image in a video frame To perform the Inter prediction reconstruction to get the image of a video frame Author: Santhana Raj h264, h264avc, video decoding, inter prediction, temporal 18 0
Comments and Ratings by Santhana View all
Updated File Comments Rating
10 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Haroldo
It seems that the length of the signal that you took is smaller than 4096. By default, I have taken a 4096 point FFT. So, unless you feed in a signal larger than 4096, the code will throw error.

Possible solutions are that you either pad zeros to your signal or reduce the No of points of the FFT(Variable N in the code)

30 Jul 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

The carrier must be present in the received signal for envelope detection to work. The formula is (1+m(t))*c(t)

Any specific doubts, you can drop me a mail.

30 Jul 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

Am not Fully Sure of the carrier frequency. But I have always assumed it to be the natural frequency of the system, either bearing or the motor itself. But whatever be the case, the carrier frequency is supposed to be very high and a generally a 0.1 cut off frequency would comfortably remove it here.

Hope this helps.

12 Jun 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

Yep. U guessed right. The shaft speed is about 29Hz.

Thanks for Rating.

17 Apr 2014 Morphological Analysis for Bearing Fault detection Applies the selected morphological operators on the signal. Author: Santhana Raj

@Anwesh
Ya, You are correct.
Fs- Sampling Frequency

N- No of points in FFT, preferably of 2^n format, less than the number of values in input

fault_tym=inverse of fault frequency

X- Fs*fault_tym. Can be proven that the result will be better if the number of structural elements taken is a multiple of Fs*fault_tym. Which multiple provides better result is being compared in this code. You can chk the ieee paper for further details...

Comments and Ratings on Santhana's Files View all
Updated File Comment by Comments Rating
10 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj Raj, Santhana

@Haroldo
It seems that the length of the signal that you took is smaller than 4096. By default, I have taken a 4096 point FFT. So, unless you feed in a signal larger than 4096, the code will throw error.

Possible solutions are that you either pad zeros to your signal or reduce the No of points of the FFT(Variable N in the code)

09 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj Haroldo

"Index exceeds matrix dimensions
Error in envelope (line 46)"

:(

11 Sep 2014 Segmentation of image Input black & white image is converted into segments. Author: Santhana Raj chow, n

11 Sep 2014 Video Reading Frame by frame Reads the video and saves each frames as a png file Author: Santhana Raj chow, n

11 Sep 2014 Spacial Prediction of Images This function spacial_predict does spatial prediction of the input image. Author: Santhana Raj chow, n

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