Analog vs digital communication

Analog vs digital communication Table of Contents Introduction Communication System Definition Analog Communication Digital Communication Advantages of Digital Communication Disadvantages of Digital Communication Comparison of Analog and Digital Communication 1. INTRODUCTION: Analog Communication is a data transmitting technique in a format that utilizes continuous signals to transmit data including voice, image, video, electrons etc. An analog signal is a variable signal continuous in both time and amplitude which is generally carried by use of modulation. Digital communicationsis the physical transfer ofdata over a point-to-point or point-to-multipointtransmission medium. Examples of such media arecopper wires,optical fibers,wirelesscommunication media, andstorage media. 2. COMMUNICATION SYSTEM Communications is the field of study concerned with the transmission of information through various means. It can also be defined as technology employed in transmitting messages. It can also be defined as the inter-transmitting the content of data (speech, signals, pulses etc.) from one node to another. A communication system is a combination of processes and the hardware used to accomplish the transfer of the Information (communication). Acommunications subsystemis afunctional unitoroperational assemblythat is smaller than the larger assembly under consideration. Examples of communications subsystems in theDefense Communications System(DCS) are: (a)A satellite linkwith oneEarth terminalinCONUSand one in Europe (b)The interconnect facilities at each Earth terminal of the satellite link (c)An optical fiber cablewith its driver and receiver in either of the interconnect facilities. Communication subsystem (b) basically consists of a receiver,frequency translatorand a transmitter. It also containstranspondersand other transponders in it andcommunication satellitecommunication system receives signals from theantenna subsystem. A communication system providesus only with a channel for the mutual informationexchange which is not apriori dedicated to certain categories ofinformationonly. Communication system consists of Analog and Digital communication. 3. ANALOG COMMUNICATION Analog communication is a communication method of conveying voice, data, image, signal or video information using a continuous signal which varies in amplitude, phase, or some other property in proportion to that of a variable. It could be the transfer of an analog source signal using an analog modulation method such as FM or AM, or no modulation at all. Analog transmission is still very popular, in particular for shorter distances, due to significantly lower costs and complex multiplexing and timing equipment is unnecessary, and in small short-haul systems that simply do not need multiplexed digital transmission. However, in situations where a signal often has high signal-to-noise ratio and cannot achieve source linearity, or in long distance, high output systems, analog is unattractive due to attenuation problems. Furthermore, as digital techniques continue to be refined, analog systems are increasingly becoming legacy equipment. Recently, some nations, such as the Netherlands, have completely ceased analog transmissions on certain media, such as television, for the purposes of the government saving money. Analog systems are very tolerant to noise, make good use of bandwidth, and are easy to manipulate mathematically. However, analog signals require hardware receivers and transmitters that are designed to perfectly fit the particular transmission. If you are working on a new system, and you decide to change your analog signal, you need to completely change your transmitters and receivers. Analog signals are signals with continuous values. Analog signals are used in many systems, although the use of analog signals has declined with the advent of cheap digital signals. 4. DIGITAL COMMUNICATION Digital communications is the physical transfer of data(a digital bit stream) over a point-to-point or point-to-multipoint transmission medium. Examples of such media are copper wires,optical fibers,wireless communication media, and storage media. The data is often represented as an electro-magnetic signal, such as an electrical voltage signal or an infra-red signal. Data transmitted may be digital messages originating from a data source, for example a computer or a keyboard. It may also be ananalog signal such as a phone call or a video signal,digitized into a bit-stream for example using pulse-code modulation(PCM) or more advanced source coding(data compression) schemes. This source coding and decoding is carried out by codec equipment. Digital communication enables the data to be transmitted in an efficient manner through the use of digitally encoded information sent through data signals. These data signals are easily compressed and, as such, can be transmitted with accuracy and speed. Unlike in an analog communications where the continuity of a varying signal can not be broken, in a digital communication a digital transmission can be broken down into packets as discrete messages. Transmitting data in discrete messages not only facilitates the error detection and correction but also enables a greater signal processing capability. Digital communication has, in large part, replaced analog communication as the ideal form of transmitting information through computer and mobile technologies. The information source generates particular symbols at a particular rate. The source encoder translates these symbols in sequences of 0s and 1s. The channel encoder is oriented towards translating sequences of 0s and 1s to other sequences of 0s and 1s, to realize high transmission reliability and efficiency. The modulator accepts streams of 0s and 1s, and converts them to electrical waveforms suitable for transmission. The communication channel provides the electrical connection between the source and destination. It has a finite bandwidth, and the waveform transmitted suffers from amplitude distortion and phase distortion. In addition to distortion, power is decreased due to attenuation of the channel. Finally, the waveform is corrupted by unwanted electrical signals, referred to as noise. The primary objective of a communication system is to suppress the bad effects of noise as much as possible. The inverse process takes place at the destination side. The demodulator converts the electrical waveforms to sequences of 0s and 1s, the channel decoder translates the sequence of 0s and 1s to the original sequence of 0s and 1s. It also performs error correction and clock recovery. The source decoder finally translates the sequence of 0s and 1s into symbols. 5. ADVANTAGES OF DIGITAL COMMUNICATION: a). It is fast and easier. b). No paper is wasted. c). The messages can be stored in the device for longer times, without being damaged, unlike paper files that easily get damages or attacked by insects. d). Digital communication can be done over large distances through internet and other things. e). It is comparatively cheaper and the work which requires a lot of people can be done simply by one person as folders and other such facilities can be maintained. f). It removes semantic barriers because the written data can be easily chaned to different languages using software. g). It provides facilities like video conferencing which save a lot of time, money and effort. 6. DISADVANTAGES OF DIGITAL COMMUNICATION: a). It is unreliable as the messages cannot be recognised by signatures. Though software can be developed for this, yet the software can be easily hacked. b). Sometimes, the quickness of digital communication is harmful as messages can be sent with the click of a mouse. The person does not think and sends the message at an impulse. c). Digital Communication has completely ignored the human touch. A personal touch cannot be established because all the computers will have the same font! d). The establishment of Digital Communication causes degradation of the environment in some cases. Electronic waste is an example. The vibes given out by the telephone and cell phone towers are so strong that they can kill small birds. In fact the common sparrow has vanished due to so many towers coming up as the vibrations hit them on the head. e). Digital Communication has made the whole world to be an office. The people carry their work to places where they are supposed to relax. The whole world has been made into an office. Even in the office, digital communication causes problems because personal messages can come on your cell phone, internet, etc. f). Many people misuse the efficiency of Digital Communication. 7. COMPARISON OF ANALOG AND DIGITAL COMMUNICATION ANALOG Analog signals are signals with continuous values. Analog signals are used in many systems, although the use of analog signals has declined with the advent of cheap digital signals. Analog systems are very tolerant to noise, make good use of bandwidth, and are easy to manipulate mathematically. However, analog signals require hardware receivers and transmitters that are designed to perfectly fit the particular transmission. If you are working on a new system, and you decide to change your analog signal, you need to completely change your transmitters and receivers. DIGITAL Digital signals are signals that are represented by binary numbers, 1 or 0. The 1 and 0 values can correspond to different discrete voltage values, and any signal that doesnt quite fitinto the scheme just gets rounded off. Digital signals are intolerant to noise, and digital signals can be completely corrupted in the presence of excess noise. In digital signals, noise could cause a 1 to be interpreted as a 0 and vice versa, which makes the received data different than the original data. Imagine if the army transmitted a position coordinate to a missile digitally, and a single bit was received in error? This single bit error could cause a missile to miss its target by miles. Luckily, there are systems in place to prevent this sort of scenario, such as checksums and CRCs, which tell the receiver when a bit has been corrupted and ask the transmitter to resend the data. The primary benefit of digital signals is that they can be handled by simple, standardized receivers and transmitters, and the signal can be then dealt with in software (which is comparatively cheap to change). Analog communication systems, amplitude modulation (AM) radio being a typifying example, can inexpensively communicate a bandlimited analog signal from one location to another (point-to-point communication) or from one point to many (broadcast). Although it is not shown here, the coherent receiver provides the largest possible signal-to-noise ratio for the demodulated message.An analysis of this receiver thus indicates that some residual error will always be present in an analog systems output. Although analog systems are less expensive in many cases than digital ones for the same application, digital systems offer much more efficiency, better performance, and much greater flexibility. 1. Efficiency: The Source Coding Theorem allows quantification of just how complex a given message source is and allows us to exploit that complexity by source coding (compression). In analog communication, the only parameters of interest are message bandwidth and amplitude. We cannot exploit signal structure to achieve a more efficient communication system. 2. Performance: Because of the Noisy Channel Coding Theorem, we have a specific criterion by which to formulate error-correcting codes that can bring us as close to error-free transmission as we might want. Even though we may send information by way of a noisy channel, digital schemes are capable of error-free transmission while analog ones cannot overcome channel disturbances; see this problem for a comparison. 3. Flexibility: Digital communication systems can transmit real-valued discrete-time signals, which could be analog ones obtained by analog-to-digital conversion,andsymbolic-valued ones (computer data, for example). Any signal that can be transmitted by analog means can be sent by digital means, with the only issue being the number of bits used in A/D conversion (how accurately do we need to represent signal amplitude). Images can be sent by analog means (commercial television), but better communication performance occurs when we use digital systems (HDTV). In addition to digital communications ability to transmit a wider variety of signals than analog systems, point-to-point digital systems can be organized into global (and beyond as well) systems that provide efficient and flexible information transmission.Computer networks, explored in the next section, are what we call such systems today. Even analog-based networks, such as the telephone system, employ modern computer networking ideas rather than the purely analog systems of the past. Consequently, with the increased speed of digital computers, the development of increasingly efficient algorithms, and the ability to interconnect computers to form a communications infrastructure, digital communication is now the best choice for many situations. Advantages and disadvantages of analog vs digital communication: 1. The first advantage of digital communication against analog is its noise immunity.In any transmission path some unwanted voltage or noise is always present which cannot be eliminated fully.when signal is transmitted this noise gets added to the original signal causing the distortion of the signal.However in a digital communication at the receiving end this additive noise can be eliminated to great extent easily resulting in better recovery of actual signal. In the case of analog communication its difficult to remove the noise once added to the signal. 2. Security is the another priority of messaging the services in the modern days.The Digital communication provides better security to messages than the analog communication.It can be achieved through various coding techniques available in digital communication. 3. In a digital communication the signal is digitised to a stream of 0 s and 1 s. So at the receiver side a simple decision has to me made whether the received signal is a 0 or a 1.Accordingly the receiver circuit becomes simpler as compared to the analog receiver circuit. 4. When signal is travelling through its transmission path gets faded gradually. So on its path it needs to be reconstructed to its actual form and re-transmitted many times.For that reason AMPLIFIERS are used for analog communication and REPEATERS are used in digital communication.amplifiers are needed every 2 to 3 Kms apart where as repeaters are neede every 5 to 6 Kms apart.So definitely digital communication is cheaper.Amplifiers also often add non-linearities that distort the actual signal. 5. Bandwidth is another scarce resource.Various Digital communication techniques are available that use the available bandwidth much efficiently than analog communication techniques. 6. When audio and video signals are transmitted digitally an AD(Analog to Digital) converter is needed at tansmitting side and a DA(Digital to Analog) converter is again needed at receiver side.While transmitted in analog communication these devices are not needed. 7. Digital signals are often an approximation of the analog data(like voice or video) that is obtained through a process called quantisation. The digital representation is never the exact signal but its most closely approximated digital form.So its accuracy depends on the degree of approximation taken in quantisation process. Digital communication has several advantages over analog communication system. Some are explained below: 1. Analog circuits require amplifiers, and each amplifier adds distortion and noise to the signal. 2. In contrast, digital amplifiers regenerate an exact signal, eliminating cumulative errors. An incoming (analog) signal is sampled, its value is determined, and the node then generates a new signal from the bit value; the incoming signal is discarded. With analog circuits, intermediate nodes amplify the incoming signal, noise and all. 3. Voice, data, video, etc. can all by carried by digital circuits. What about carrying digital signals over analog circuit? The modem example shows the difficulties in carrying digital over analog.

Gender Roles Exploited with Humor Essay

The use of gender roles and stereotypes in commercials has slowly become more of an issue as men and women’s true societal roles have undoubtedly changed over time. The push for women’s equality over the past 50 years has been progressing each and every year, and rightly so. As women have become more self-sufficient in their everyday lives, their dependency from males and gender stereotypes have been changing drastically. These social changes have also sparked the progression of gender roles in advertisement and how men and women are presented to the public through television. Recently, many commercials have made drastic efforts in order to present more equal gender roles by trying to eliminate some of the stereotypes that have been part of our society for years. However, despite many of the progressions that have been made, commercials tend to revert back to some of the old stereotypes and perceived gender roles in order to create humor. One type of humor that has been prevalent in many recent commercials is the exploitation of gender stereotypes in an attempt to make a mockery of certain socially acceptable gender roles and actions, while at the same time displaying some of the characteristics that are not accepted by society. The humor in these types of commercials comes through the comparison of the same actions performed by both men and women, but one of the genders looks ridiculous performing these actions, despite the fact that they are the same. This type of marketing technique tends to cause a disproportion of equality between the two genders, because it is displaying how the actions of one gender are accepted by society, while similar actions by the other gender just appear to be unreasonable. In order to create a comedic effect in their commercials, many companies have started to disregard the progression for equality in gender roles and have started to display some of the same old gender stereotypes that w e, as a society, have tried to separate from. Through my exploration of Snickers and Heineken commercials, I was able to outline a very particular style of comedy that affected both genders in negative ways. Two very well known brands, Heineken and Snickers, have started to show men displaying some of the female stereotypes we have seen in other commercials. Now, some might say that this is a good thing because it is trying to blur the line between the two stereotypes and show that men can experience some of the same things that women do. However, I see this as quite the opposite. It seems that use of men displaying female stereotypes is, in a sense, making fun of the women. While the brands have achieved their ultimate goal of providing a humorous commercial, this humor comes at the expense of us laughing at how ridiculous the men appear when they are acting out some of the women stereotypes. To get a better understanding of how the commercials are creating this style of satire, lets take a closer look at some examples from Heineken. In a Heineken commercial from 2009, the scene starts out inside a home, and the women of the house leads a group of her five girl friends through the living room, the kitchen, her bedroom, and eventually they arrive outside of a closet. The woman proceeds to proudly open up the closet doors, unveiling shelves full of shoes and clothes, with a table in the middle full of shimmering jewelry. All of the woman’s friends go absolutely crazy and begin jumping up and down while simultaneously releasing screams of excitement. As the excitement begins to die down, they hear faint cries of excitement coming from across the house. The scene then immediately switches over to the men’s closet, a walk-in freezer, full of Heineken beer. All of the men appear to be imitating the women’s excitement that was displayed moments earlier, with slight exaggeration, as one of the men begins to shed a tear. The two stereotypes displayed in this commercial were pretty clear. It shows men getting overly excited about a room full of beer, while women are getting excited over a room full of shoes and jewelry. These stereotypes are not what make the commercial offensive to any one of the particular genders though. When the audience sees men getting excited over beer as much as women get excited over shoes it tends to expose the ridiculousness in the actions of women because people are thinking â€Å"wow†¦imagine if men got as excited over beer as women got over shoes†¦that would be stupid†. This train of thought is what starts to draw the lines between men and women and how one gender’s actions can be accepted by society, but similar actions from the other cannot. It suggests that men should remain calm, cool, and collective at all times unless they want it to be viewed as a joke. On the reverse side, it suggests to women that their actions are only acceptable because they’re girls, and that if men were to do the same thing, it would appear ridiculous. The next commercial I looked at was a Snickers Super Bowl commercial from 2010. The commercial shows three men working at a construction site, all of the sudden one of the men transforms from a man in work boots and a hardhat, into a women with nice clothes and heels, while still standing in the middle of the construction site. After this transformation the â€Å"woman† begins to complain about the work and how hot it is outside. The two men look at the women with a disgusted look on their face and advise her to â€Å"eat a Snickers†¦you turn into a diva when you’re hungry†. The woman gets tossed a Snickers bar from one of the men, takes a bite, and suddenly transforms back into his original character as a construction worker. This commercial displays one of the very old and outdated stereotypes of women not being able to perform laborious tasks. When the man turns into a woman, he begins to start complaining about the hard work and the hot weather. This commercial again exposes how unacceptable it would be if a man were to act like a woman on the job. In contrast, it also tries to show how out of place a woman would look on a construction site by placing a nicely dressed woman in the middle of the dirt filled construction area. It attempts to show how men are expected to be tough and free of complaints, unless they want to be ridiculed by their co-workers with words such as â€Å"diva†. The commercial implies that as soon as men start to complain about work or being tired, they are immediately labeled as having female characteristics due to our current stereotypical views on gender roles and actions. Through these commercials I have discussed above, it is clear that some of the new tactics for adding humor to commercials has become a sort of mockery of the stereotypes between men and women. Heineken and Snickers have both tried to show scenarios in which we see men behaving like women in an attempt to show how ridiculous it would be if males were to exhibit some of the same social stereotypes we associate with women. By doing this, the two commercials begin to draw a line between the actions and characteristics that are acceptable for women, but not for men. These marketing schemes are detrimental because they provide a clear example of how society can accept the actions of one gender, but when the other gender performs some of the same actions it becomes humorous satire. I think that a comedic commercial without gender stereotypes would appear much more sophisticated and would be better received by the public. I hope that advertising agencies will begin to realize this and that future commercials will appear both humorous and professional.

Where to Find Dissertation Writing Services

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The Problem Of Evil And The Existence Of God - 1636 Words

The Problem of Evil is one of the most influential and common arguments in modern philosophy against the existence of a Greater Being, God (Trakakis, 2006). Both Theist, those who believe in the existence of God, and Atheist, those who don’t believe in the existence of God, argue that evil exists in the world. The Problem of Evil explores whether the existence of evil and suffering constitutes significance evidence for atheism. When looking at the definition of the greater being, most refer to the Omni-god in which is Omnipotent, Omniscient and Omnibenevolent, meaning God is all powerful, all knowing and all good. Atheist Philosophers therefore argue that no Omnipotent, Omniscient, Omnibenevolent greater being would allow evil and†¦show more content†¦The theological argument receives many criticisms however the main theodicy against the theological argument of evil is the free-will defence. Many theists believe that God allows evil to occur in order for human beings to be given free will. This defence suggest by allowing free will, God enables us to choose to believe in his greater power or to reject any belief in him. Theists argue that this free will outweighs all evil actions and it is the abuse of this free will leads to evil (Jackson, 2014). Atheists often turn to the evidential argument of the problem of evil. This argument directly enhances Rowe’s first and second premise in which lead to the consolidation of the third. To discuss the evidential argument, we will first look at premise 1 of Rowe’s argument. 1. There are instances of intense suffering which an omnipotent, omniscient being could have prevented without thereby losing some greats good or permitting some evil equally bad or worse Rowe supports this premise by presenting the List of Pointless Evils, in which look at cases of intense suffering that God have prevented without having lost a greater good or preventing a greater or worse evil occurring (Howard-Snyder, 2008). The most common example of pointless evil is of the fawn in a devastating bush fire, which badly burns however doesn’t kill the fawn instantly. The fawn therefore lies in agony for days, slowly dying. Rowe argues this is aShow MoreRelatedThe Problem Of Evil Questions God s Existence995 Words   |  4 PagesThe Problem of Evil Questions God’s Existence An argument against the existence of God is based on the presence of evil in the world. This deductively valid argument is divided into two categories; human action and natural evil (Sober, 2005, p. 120). Human action discusses how experiences makes us better people, while natural evil are tragic events that are not under the control of humans. Each category is used as evidence to refute God as an all-powerful omniscient, omnibenevolent, or omnipotentRead MoreThe Problem Of Evil : An Argument Against The Existence Of God1922 Words   |  8 PagesNotes †¢ The problem of evil (the problem of suffering) is an argument against the existence of God †¢ The argument against the existence of God is incompatible with the existence of an all-loving, all-powerful God. 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Throughout The Years As Human Beings1201 Words   |  5 PagesThe Existence of God Throughout the years as human beings keep learning about the world we are finding out that we are living in a world where evil surrounds us. This belief conflicts with the beliefs of theism, one who believes in a God or Gods, especially a personal God who’s in control of the world. If there was an all-powerful, all-knowing, and all-good God, then he should have the knowledge that there’s evil in the world, he should have the benevolence to want to stop the evil, and he shouldRead MoreThe Existence Of God : Evil1297 Words   |  6 PagesThe Existence of God Throughout the years as the human species keeps learning about the world we live in, we are finding out that we are surrounded everywhere by evil. This seems to conflict with the belief of theism, one who believes in a God or Gods, especially a personal God who’s in control of the world. If there was an all-omnipotent, all-omniscient, and all-benevolent God, then he should have consummate knowledge that there’s evil in the world. Given that, if he knows there’s corruptionRead MoreThe Nature And Existence Of God1364 Words   |  6 PagesThe existence of suffering in the world provides a case against the existence of God as the problem of evil. It seems that the God of classical theism is incompatible with the reality of the world around us; could such an all-loving, all-powerful and all-knowing God exists in conjunction with instances of immense and seemingly pointless suffering? It does seem unlikely that such a God exists alongside evil. However, it is ques tionable whether this is a proof that God does not exist. The problem ofRead MoreEssay on The Problem with Evil in Religion1259 Words   |  6 PagesThe problem of evil is widely considered as the most detrimental problem to the monotheist. It is also the primary objection to the overall existence of God. The problem is very easy to comprehend: If God is an all-perfect, all-knowing, all-powerful deity then why do we live in a world with any imperfection or negativity at all? Why do bad things happen at all? Especially to the good people in the world and the millions of innocent people who suffer on a daily basis. Gottfreid Leibniz was a philosopherRead MoreThe Existence Of Moral And Natural Evil1263 Words   |  6 Pagesto address the existence of moral and natural evil with the perception of an Omni-max god that encompasses three key properties; omnibenevolence all-good or all-loving, omnipotence all-powerful, and omniscience all-knowing. High theology accepts that God does exist in the universe as the greatest being of the Omnis, where as low theology acknowledges the existence of God without one of the key properties of the Omni-max god. 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Mackie wrote a very convincing piece on the problem of evil called â€Å"Evil and Omnipotence,† in which he attempts to show that one of the following premises must be false in order for them to be consistent with each other. #1. God is omnipotent. #2. God is morally perfect. #3. Evil exists. The problem of evil is a deductive a priori argument who’s goal is to prove the non-existence of God. In addition to Mackie’s three main premises