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Smoothing analog signal

Created by: Anderson at: 5/22/2006 10:41 PM (26 Replies)

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27 Entries

Entries per page: 10 | 20 | all

6/12/2006 8:39 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 11/12/2024 Posts: 4785 Rating: (730)	[quote user="Late"] The blocks are working fine, also the one of Pagia. Late, Did you refer to this: "out = last out + k * in" (by Pegaia) ? Iwasnot so sure this could work.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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6/12/2006 4:13 PM	Rate (0)
MartAnd Posts: 31 Rating: (2)	Yes Jacek, I do mean moving average and nothing else. BTW I think linear regression is a pretty tough one to implement, can we use the least square method[:D]? World Cup is on so I better go home than annoying anyone..... Regards MartAnd
MartAnd Posts: 31 Rating: (2)
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6/12/2006 11:10 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Hi Jacek, I mean Anderson's program... [:blush:]
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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6/19/2006 9:16 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 11/12/2024 Posts: 4785 Rating: (730)	[quote user="MartAnd"] I do mean moving average and nothing else. So I'm amazed how you managed to transform the moving average (which is special case of a FIR) into some realization of an IIR.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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6/20/2006 8:40 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 11/12/2024 Posts: 4352 Rating: (1452)	Hi, sorry: first I am not in Office last days and I can follow the theme. Second, when I suggested a linear regression, I don’t would create so big repercution. Follow I send a document with a general explanation about linear regression. The graphic shows the difference between average method and linear regression method. I attach also a sample program. Attachment SA_en.zip (1949 Downloads)
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users Sebastian_NLS

6/22/2006 4:24 PM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 11/12/2024 Posts: 4785 Rating: (730)	Let's say that I have idea what a linear regression is. That's why I wrote that it's overkill. Like constructing a laser gun to kill a fly.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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6/27/2006 8:34 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 11/12/2024 Posts: 4352 Rating: (1452)	I really agree with your opinion. He applies only in very specific cases.
	Denilson Pegaia Siemens Industry Sector Technical Support
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12/25/2008 6:24 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	RAWAT Dear sir I use your program (FB201 block)for smoothing analog signal. In yourprogram you usezero error signal and filtout in output. Sir please tell when this zero error signal is high. Can i use this block in fb please reply with regards rawat Dear Rawat, The error is coming when the "F_Tau" signal is zero, when that happens the calculations go wrong. This is especially done for a changing variable on "F_Tau", This block could be used as a Multiple Instance if you mean, could it be ysed in a FB....
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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6/5/2011 11:12 PM	Rate (0)
KayBee Posts: 241 Rating: (7)	Pegaia I know, that it is a polemic theme, but I want do some considerations: If you use a filter of the type: out = last out + k * in, you have a new calculated value in each program cycle. However, a past value has a “weight” for a long time. So, it reacts quickly but has also inertia. If you use a mean (average) formulation, statisticly, you can clear any random noise. However you need some samplings, i.e. your filtered value is always “old”. So it is applicable if you can sample your signal quickly as you need. Better as mean is a regression analysis to a f(y)= a * t +b, so, you can obtain a more precise value at the last sample moment. Dear Pegaia, Could you please share your formula litle more detail. What I understand is f(y)= filtered valu a=contant value t=input unfiltered value b=another constant value that means we need again the fine tuning for parameter a & b?
KayBee Posts: 241 Rating: (7)	Last edited by: PowerTags at: 6/5/2011 11:13 PM some english
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6/6/2011 10:50 AM	Rate (0)
Krish Silver Member Joined: 5/24/2007 Last visit: 4/24/2024 Posts: 284 Rating: (27)	Hi Appreciate the work you have done in developing your own function blocks. But have you guys tried the Open Source Library which is available also for Siemens S7at this link www.oscat.de. You need to download the S7 library.You will find a lot of filter functions to achieve these same functions.Advantages is that many people are using and so well tested. Disadantage :- Bad English documentation. But I guess the program is clear and structured. Krish

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