Author 
Message 
clusardi2k@aol.com science forum beginner
Joined: 20 Oct 2005
Posts: 16

Posted: Mon Jun 26, 2006 11:55 am Post subject:
What is an integrator with a variable gain, and how to implement in C (Min/Max Limiters and One Frame Delays)



Can you tell me everything there is to know about these to a C
programmer?
How would they be implemented in the C language? I would like intuitive
explanations. How would you explain them to a highschool student?
I think I've seen these in conversations on control theory. Is the
integrator
that 1/S stuff?
In books, I saw descriptions of integrators. I saw two definitions of
what I
assume to be the same thing. They used examples such as these two:
(1) If you take the Fourier (or maybe Laplace) Transform of equation
described via Circuits 101 steps and you have a term 1/S then that's an
integrator?
(2) It's an actual mathematical integration operation being performed
to determine the output voltage of a circuit?
What about MIN/MAX limiters, and one frame delays? What are they?
How would they be implemented in C?
Is a MIN/MAX limiter like a minimum function in a computer language?
Where a value under consideration would pass through the gate if it's
between the min and max inclusive? Otherwise, a default value is
output.
Is a MIN/MAX limiter like a hard limiter. A hard limiter will output 1
if input
is positive, and output 1 if input is negative. Can this be
implemented in
the C computer language with a "sign" function?
Are one frame delays a register that holds the value until the time of
the delay is over? What is a frame?
Help with intuitive explanations of these,
Chris Lusardi 

Back to top 


Ian Parker science forum Guru Wannabe
Joined: 15 Jul 2005
Posts: 100

Posted: Mon Jun 26, 2006 1:47 pm Post subject:
Re: What is an integrator with a variable gain, and how to implement in C (Min/Max Limiters and One Frame Delays)



Chris L wrote:
Quote:  Can you tell me everything there is to know about these to a C
programmer?
How would they be implemented in the C language? I would like intuitive
explanations. How would you explain them to a highschool student?
I think I've seen these in conversations on control theory. Is the
integrator
that 1/S stuff?
In books, I saw descriptions of integrators. I saw two definitions of
what I
assume to be the same thing. They used examples such as these two:
(1) If you take the Fourier (or maybe Laplace) Transform of equation
described via Circuits 101 steps and you have a term 1/S then that's an
integrator?
(2) It's an actual mathematical integration operation being performed
to determine the output voltage of a circuit?
What about MIN/MAX limiters, and one frame delays? What are they?
How would they be implemented in C?
Is a MIN/MAX limiter like a minimum function in a computer language?
Where a value under consideration would pass through the gate if it's
between the min and max inclusive? Otherwise, a default value is
output.
Is a MIN/MAX limiter like a hard limiter. A hard limiter will output 1
if input
is positive, and output 1 if input is negative. Can this be
implemented in
the C computer language with a "sign" function?
Are one frame delays a register that holds the value until the time of
the delay is over? What is a frame?
Help with intuitive explanations of these,
Chris Lusardi

i = sqrt(1). Note that we obtain real functions where C(k) =C*(Nk)
where * denotes the complex conjugate.
In the case of a Fourier transform you can readily
integrate/differentiate.
exp(ikx) > ikexp(ikx) on differentiation and exp(ikx)/ik on
integration. Hence differentiation/integration is a trivial function.
In general.
A simple C program would be simple summation. In control theory you
have something called a "tranfer function". This is a juju word in
control theory. The simple way of looking at it in high school Physics
is to say that we have a fairly large aircraft and we perform rapid
movements on the control stick. Quite clearly a large aircraft cannot
move, it has too much intertia. To find out how a plane behaves you
need.
T(k)I(k)exp(ikx) where T(k) represents the transfer function and I(k)
the impulse applied. We obtain I(k) by taking the Fourier Tranform of
the control signals appied. Because a system is essentially low pass
control signals in an autopilot are often bang bang (0 or 1) and
applied fast. This is not noticed by the crew or passengers. 

Back to top 


Google


Back to top 



The time now is Sat Jun 24, 2017 1:53 pm  All times are GMT

