+ Post New Thread
Results 1 to 9 of 9
 26th January 2008, 10:51 #1
 Join Date
 Dec 2006
 Posts
 188
 Helped
 21 / 21
 Points
 2,238
 Level
 10
Convolution
What is the differance between convolution and correlation
 26th January 2008, 10:51
 26th January 2008, 10:52 #2
 Join Date
 Jan 2008
 Posts
 8
 Helped
 3 / 3
 Points
 941
 Level
 6
Re: Convolution
Originally Posted by sundarmeenakshi
1 members found this post helpful.
 26th January 2008, 14:30 #3
 Join Date
 Dec 2007
 Location
 jordan
 Posts
 100
 Helped
 58 / 58
 Points
 2,396
 Level
 11
Re: Convolution
correlation is used to compare the similarity of two signals, the result is a signal that shows this similarity and reaches its maximum at the time when the two signals match best. correlation can be used to measure the delay of a certain system.
convolution is used to compute the output of a certain linear system when a certain input signal is applied to it. this is done by applying convolution between the input signal and the impulse response of the system
2 members found this post helpful.
 27th January 2008, 08:59 #4
 Join Date
 Jan 2008
 Posts
 61
 Helped
 8 / 8
 Points
 1,180
 Level
 7
Re: Convolution
From mathematical point of view convolution of two function is:
x(t)*y(t)=∫x(Θ)y(tΘ)dΘ
and correlation is
E[x(t)y(t)]=∫x(Θ)y(t+Θ)dΘ
1 members found this post helpful.
 27th January 2008, 08:59
 27th January 2008, 11:48 #5
 Join Date
 Aug 2005
 Posts
 39
 Helped
 5 / 5
 Points
 1,462
 Level
 8
Re: Convolution
Convolution is the operation / transformation that governs the i/p  o/p relationship in a LTI system.
Correlation is a statistical measure of how similar two waveforms or random processes are.
In the case of a matched filter, correlation and convolution becomes the same.
1 members found this post helpful.
 29th January 2008, 07:33 #6
 Join Date
 Jan 2008
 Posts
 15
 Helped
 1 / 1
 Points
 960
 Level
 7
Convolution
convolution is specifically used for the multiplication of continous and discrete time signal in time domain and valid for LTI system but correlation is matching and comparision of signal and there are two types auto and cross correlation and its example in missile imaging
Added after 22 seconds:
convolution is specifically used for the multiplication of continous and discrete time signal in time domain and valid for LTI system but correlation is matching and comparision of signal and there are two types auto and cross correlation and its example in missile imaging and using correlators and matched filters for taht
 30th January 2008, 08:12 #7
 Join Date
 Jan 2008
 Location
 Bangalore,India
 Posts
 207
 Helped
 35 / 35
 Points
 2,684
 Level
 12
Re: Convolution
Hi,
Convolution of two signals can be interpreted graphically as folows:
supose you take convolution between x(t) and y(t). Then in t domain just reverse the signal y(t) i.e. plot the signal y(t). Now translate the signal y(t) from ∞ to Γ. The overlap area is the convolution between x(t) and y(t). at the point Γ.
On the otherhand the correlation is the same thing, only thing is that, you dont have to invert the signal y(t) in t domain. Translate y(t) itself from ∞ to Γ. The overlap area gives the correlation between these two signals.
 23rd February 2008, 04:08 #8
 Join Date
 Nov 2007
 Posts
 14
 Helped
 10 / 10
 Points
 1,093
 Level
 7
Convolution
Completly agree with asoom
 23rd February 2008, 15:28 #9
 Join Date
 Sep 2007
 Posts
 143
 Helped
 3 / 3
 Points
 1,833
 Level
 9
Convolution
Correlation + Shifting = Convolution
This is the difference between the both.
+ Post New Thread
Please login
LinkBacks (?)

Untitled document
Refback This thread15th May 2014, 11:06