White Gaussian Noise
in [Matlab]
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From: Rupika Bandara on 29 Apr 2010 19:03 I want to add white Gaussian noise of four intensities (i.e. 1%, 2%, 5% and 10% noise to signal ratio) to impact force signals and the acceleration response time histories. Can anyone give me a help?
From: ade77 on 29 Apr 2010 19:17 "Rupika Bandara" <rupika23(a)yahoo.com> wrote in message <hrd378$4e$1(a)fred.mathworks.com>... > I want to add white Gaussian noise of four intensities (i.e. 1%, 2%, 5% and 10% noise to signal ratio) to impact force signals and the acceleration response time histories. Can anyone give me a help? if you have communications toolbox: doc awgn doc wgn
From: TideMan on 29 Apr 2010 19:21 On Apr 30, 11:03 am, "Rupika Bandara" <rupik...(a)yahoo.com> wrote: > I want to add white Gaussian noise of four intensities (i.e. 1%, 2%, 5% and 10% noise to signal ratio) to impact force signals and the acceleration response time histories. Can anyone give me a help? For a single percentage: y1=y + pc/100*std(y)*randn(length(y),1); I'll leave to you the upgrading of this into a matrix equation to compute all the pcs at once.
From: Rupika Bandara on 29 Apr 2010 23:40 TideMan <mulgor(a)gmail.com> wrote in message <ec0f1675-e601-4583-9888-83ff192fd004(a)a18g2000prd.googlegroups.com>... > On Apr 30, 11:03 am, "Rupika Bandara" <rupik...(a)yahoo.com> wrote: > > I want to add white Gaussian noise of four intensities (i.e. 1%, 2%, 5% and 10% noise to signal ratio) to impact force signals and the acceleration response time histories. Can anyone give me a help? > > For a single percentage: > y1=y + pc/100*std(y)*randn(length(y),1); > > I'll leave to you the upgrading of this into a matrix equation to > compute all the pcs at once. Hi, Sorry. I am not good at Matlab. So can you explain me further. what is std (is it standard deviation), what is the meaning of randn, and length (y). my force vectors are [100 300 700 800]. Then how can I add 1%, 2%, 5% and 10% noise to signal ratio to these forces?
From: Mark Shore on 29 Apr 2010 23:59 "Rupika Bandara" <rupika23(a)yahoo.com> wrote in message <hrdjf7$llb$1(a)fred.mathworks.com>... > TideMan <mulgor(a)gmail.com> wrote in message <ec0f1675-e601-4583-9888-83ff192fd004(a)a18g2000prd.googlegroups.com>... > > On Apr 30, 11:03 am, "Rupika Bandara" <rupik...(a)yahoo.com> wrote: > > > I want to add white Gaussian noise of four intensities (i.e. 1%, 2%, 5% and 10% noise to signal ratio) to impact force signals and the acceleration response time histories. Can anyone give me a help? > > > > For a single percentage: > > y1=y + pc/100*std(y)*randn(length(y),1); > > > > I'll leave to you the upgrading of this into a matrix equation to > > compute all the pcs at once. > > Hi, > Sorry. I am not good at Matlab. So can you explain me further. what is std (is it standard deviation), what is the meaning of randn, and length (y). my force vectors are [100 300 700 800]. Then how can I add 1%, 2%, 5% and 10% noise to signal ratio to these forces? Type help std, help randn, help length from the command line. Or read http://www.mathworks.com/access/helpdesk/help/pdf_doc/matlab/getstart.pdf or one of the numerous introductory books available.
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