# 1.2 Signal operations

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This module will look at two signal operations affecting the time parameter of the signal, time shifting and time scaling. These operations are very common components to real-world systems and, as such, should be understood thoroughly when learning about signals and systems.

## Introduction

This module will look at two signal operations affecting the time parameter of the signal, time shifting and time scaling. These operations are very common components to real-world systems and, as such, should be understood thoroughly when learning about signals and systems.

## Time shifting

Time shifting is, as the name suggests, the shifting of a signal in time. This is done by adding or subtracting aquantity of the shift to the time variable in the function. Subtracting a fixed positive quantity from the time variable will shiftthe signal to the right (delay) by the subtracted quantity, while adding a fixed positive amount to the time variable will shift the signal to the left (advance) by the added quantity.

## Time scaling

Time scaling compresses or dilates a signal by multiplying the time variable by some quantity. If that quantity is greaterthan one, the signal becomes narrower and the operation is called compression, while if the quantity is less than one, thesignal becomes wider and is called dilation.

Given $f\left(t\right)$ we woul like to plot $f\left(at-b\right)$ . The figure below describes a method to accomplish this.

## Time reversal

A natural question to consider when learning about time scaling is: What happens when the time variable is multipliedby a negative number? The answer to this is time reversal. This operation is the reversal of the time axis, or flippingthe signal over the y-axis.

## Signal operations summary

Some common operations on signals affect the time parameter of the signal. One of these is time shifting in which a quantity is added to the time parameter in order to advance or delay the signal. Another is the time scaling in which the time parameter is multiplied by a quantity in order to dilate or compress the signal in time. In the event that the quantity involved in the latter operation is negative, time reversal occurs.

what are free good
how do you determine price change
what is economics?
what is economic
Economics is the study of how Individual consumer, institution and society as a whole uses its available finite resources to satisfy infinite needs and wants
Richard
Explain the following concepts using suitable exemple. 1) National budget. 2) National debt
Rosalie
other things remain constant.
explain scarcity
scarcity occurs when there are not enough resources to satisfy human's needs and wants therefore we need to allocate our resources using the price mechanism.
Isha
scarcity is when there is inadequate resources to catch the unlimited wants which would compel individual to make choice.
Prince
scarcity simply means when there's a shortages of resources to satisfy Hunan's need and wants in a particular time, which means the demand for it at the moment is higher than the supply
Abu
scarcity simply means when there's a shortages of resources to satisfy humans need and wants in a particular time, which means the demand for it at the moment is higher than it supply.
Abu
😂😂😂
Isha
That escalated real quick😂
Isha
scarcity is sometimes considered as the basic problems of economics resources r scarce because we live in a world of humans in which wants are infinite but the land labor and capital r required to satisfy those wants are limited
Nkwenti
scarcity means unlimited resources
Rena
resources are limited but human wants can not be limited
Himanshu
joint or complementary demand
what is demand
it maybe define as the amount or quantity of goods and services which a consumer is willing to buy with the ability to pay at a given price at a particular time
Habib
yesoo thanks dear
Gyamfua
Explain 3 reasons why the manufacturer may decide to sell directly to the consumers
Rosalie
why is economics a science
Because science is all about thinking by making models whether a computational or Mathematical. Economics is a social sciences because it effects society but to understand Economics we use maths so it is a Science
Amit
hi
Mony
hello
Amit
I hope.......Economic is social science because it makes new new currency of money,it is decided the country’s depend system and the system be repeated others benefits in our ...
Anik
yeah
Habib
so what is the disadvantages of mix economic system
Habib
Economics is regarded as a social science because it uses scientific methods to build theories that can help explain the behaviour of individuals, groups and organisations.
Ali
The question is: why is Economic a "science" and not why is economics a "social science?" Alright folks?
Xavier
In my own understanding of why economics is a science it bcz it deals mainly on human resources just like biology that deals in the human body why economics is science it also deals on the management of human resources all over the world bcz without economics there will be no human resources
Ogbonnaya
what is technology
Nkwenti
my response to the earlier question is, economics is a science but not a pure science like biology, chemistry and physics. The reason is that those pure science study inanimate object while economics study human being, their experiment are predictable.
raimi
Economics is a social science subject that shows the relationship between ends and scarce means with their alternative uses
Ajenifuja
what is Equilibrium?
it means equal price and equal quality
Arthur
thank u Arthur!
Fatima
😇🙏
Fatima
Thanks
Moses
Equilibrium is a state of balance in an economy. In as far as market forces are reasonably concerned, equilibrium means the state at which the quantity of goods supplied is equal to the quantity of goods demanded.
Xavier
what is labour
Ayham
labor can be define as a both physical and mental effort of man put forward towards production
Habib
name the types of demand and explain any two
ALIMAMYISLA
Joint demand Composite demand Competitive demand
Ajenifuja
Labourcan be defined as man mental and physical exertion
Ajenifuja
equilibrium is a state of balance especially between opposing forces or influences
Nkwenti
equilibrium means the state of point in which a person is satisfied and after that point if that person consumes more than the satisfaction level will decrease.
Himanshu
Equilibrium is a state of balance in and economy. that mean equal privé and equal quality e.t.c.
Rosalie
Equilibrium is a situation in which economic forces such as supply and demand balance and in the absence of extremal lnfiuences the values of economic variables will not change.
Gyamfua
what is elasticity
difference between demand and supply
Demand- It is the desire of a buyer and his ability to pay for a particular commodity at a specific price. Supply- It is quantity of a commodity which is made available by the producers to its consumers at certain price.
Ali
yes OK thank you dear
Gyamfua
Demand can be defined as the ability a buyer is willing and able to pay at a specific price and in agiven period of time Supply can be defined as the ability the producer is willing to supply with a specific price
Ajenifuja
thanks
antony
what is labor force
Habib
demand represents the consumer while supply represents the firm
Nkwenti
formula for price elasticity of demand
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