# Integration involving the minimization of signal transmission error

• Sep 21st 2010, 06:19 PM
kaiser0792
Integration involving the minimization of signal transmission error
I'm studying the transmission of signals and have come across an integration that I don't understand. I understand the mechanics of the integration,
but not the purpose for solving it the way my textbook does.
Background: It is used to solve for a constant c which is a multiplier of signal error
function. The integration gives c, such that the signal error will be minimized.

The integral is: c = [1/pi] Definite integral (limits 0 to 2pi) f(t) sin(t) dt, where f(t)
represents the signal and sin t, an approximation of the signal.
My text evaluates as follows:
[1/pi] (Integral (limits 0 to pi) sint t dt + Integral (limits pi to 2pi) -sin t dt) = 4/pi

Again, I understand the integration, but not why it is broken into the sum of the 2 integrals. What is the reasoning behind this process? Thanks for the help.
• Sep 22nd 2010, 04:16 AM
CaptainBlack
Quote:

Originally Posted by kaiser0792
I'm studying the transmission of signals and have come across an integration that I don't understand. I understand the mechanics of the integration,but not the purpose for solving it the way my textbook does.

Background: It is used to solve for a constant c which is a multiplier of signal error
function. The integration gives c, such that the signal error will be minimized.

The integral is:

c = [1/pi] Definite integral (limits 0 to 2pi) f(t) sin(t) dt,

where f(t) represents the signal and sin t, an approximation of the signal.

My text evaluates as follows:

[1/pi] (Integral (limits 0 to pi) sint t dt + Integral (limits pi to 2pi) -sin t dt) = 4/pi

Again, I understand the integration, but not why it is broken into the sum of the 2 integrals. What is the reasoning behind this process? Thanks for the help.

What happened to f(t)? You are not telling us the whole story are you?

CB