dear Sir,

Thank you for your replay,

you are correct sir, this cross-correlation computation between two digital
sequences,
1-The purpose of this calculation to calculate the highest value found form
the correlation, but later I want to use the position of the highest
value(for example: the highest value comes from first or second or third
or???. Calculation).
2-The original input data is digital signal with 1 or 0 , but later I will
change this to 1 or -1 only, so all the input values are 1 or -1  only.
3- Yes Sir, as I mentioned before I want to know the position in the M
sequence where the highest vale of Ax occurs.
4-the speed is important, but I do not understand the meaning of size of the
code.
5- Unfortunately I am not familiar with any programming language except a
little knowledge of C, and I am start already to Study a little about C++. I
sue personal computer.
6- The sequence M is known already, I mean the element of this sequence is
decided already, and should  be written in the program body as a known
sequence, in other hand, the sequence S is changeable so should be inter by
the user as sequence consist of nine element or number.

I hope my explanation is enough












>From: Bob Ammerman <rammerman@ADELPHIA.NET>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: M  and S sequences
>Date: Mon, 29 Apr 2002 07:15:23 -0400
>
>This looks like some sort of correlation computation.
>
>A couple of questions:
>
>1. Do you need to keep the individual values of A0, A1, A2, A3, etc. or
>only
>the highest value found?
>
>2. Are your inputs all either -1 or 1 (as shown in your example) with no
>other values possible?
>
>3. Do you need to know the position in the sequence M where the highest
>value of Ax occurs?
>
>4. What is most important in this calculation? Speed? Size of RAM? Size of
>code?
>
>5. What language do you want to implement it in? On a PIC? on a PC?
>
>Bob Ammerman
>RAm Systems
>
>
>----- Original Message -----
>From: "ali dawji" <ali_dawji@HOTMAIL.COM>
>To: <PICLIST@MITVMA.MIT.EDU>
>Sent: Monday, April 29, 2002 5:14 AM
>Subject: M and S sequences
>
>
> > Dear Sir
> > I have a question and I hope if you can answer me.
> >
> > I have tow one dimensional sequence or matrix.,
> > The first sequence is called M with length 511 number:
> > M[511]={ 1, 1, 1, 1, 1, 1, 1,-1,-1,1,1,-1,-1,1,-1,-1,-1,1?????..};
> > And the second sequence is called with nine numbers
> > S [9] = {1, 1, 1,-1,-1, 1,-1,-1,-1};
> >
> > I want to
> > 1- Multiplied the sequences S with first ninth number of the sequence M,
>and
> > keep the result as A0,
> > 2- The multiplication procedure as flows
> > The first number of M * the first number of S, if the answer is negative
>=>
> > (-1), and if the answer is positive => 1
> > Example:
> > M= {1, 1, 1, 1, 1, 1, 1,-1,-1};   /*(first ninth number of M sequence)*/
> > S= {1, 1, 1,-1,-1, 1,-1,-1,-1};
> > 1*1=1
> > 1*1=1
> > 1*1=1
> > 1*-1=-1
> > 1*-1=-1
> > 1*1=1
> > 1*-1=-1
> > -1*-1=1
> > -1*-1=1
> > The answer is 3= (6*1- (3*-1))
> > 3-shift the sequence M on number to the right and multiplied the
>sequence
>S
> > by the M sequence (from number 2-10). And keep the multiplication result
>in
> > A1,
> > repeat the procedure of the multiplication till  the end of the sequence
>M.
> > 4- Calculate the maximum value multiplication result A0, A1, A2?
> >
> >
> > sorry since my language is not so good
> > thank you
> >
> >
> >
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