Telecommunication in the 21st Century

Telecommunication in the 21st Century Telecommunication in the 21st century have improved over the decade by the introduction of better techniques through which signals can be transmitted from a transmitter through a medium to a receiver. These techniques have improved mobile communications, satellite transmissions and helped to improve data security. Some of these techniques are amplitude modulation (AM), frequency modulation (FM), sampling and link analysis (SLA) and PCM. The acronym PCM represents ‘Pulse-code modulation’, which is used for digitizing analogue data, for instance, audio signals. This is carried out by sampling analogue signals at uniform interval and then quantized to a series of symbols in a digital code (e.g. 10001).Its technically a way in which analogue signals are converted to digital form. PCM technique has its advantages; It makes processing of signals cheap since PCM is digital. It helps to filter off frequencies above the highest signal frequency. Pulse-code modulation has been a form used for some compact disc formats, digital video and for digital audio in computers. In PCM, there are series of processed to be followed; Filtering Sampling Quantizing Binary coding Companding Filtering This is a process where frequencies above the highest signal frequency are removed. The reason for this is that if this frequency is not removed, problems would occur when going to the next stage of sampling. Sampling This stage of the PCM is performed through PAM (pulse amplitude modulation).It answer the question of how signals change from one form to another (analogue to digital). It makes use of the original analog signal and uses it for the amplitude modulation of a pulse which has constant amplitude and frequency, this constant frequency is known as the sampling frequency (i.e. the number of samples per second ).The sampling frequency have to be more than the maximum frequency of the analogue signal. To work out the sampling rate, Nyquist theorem is used; â€Å"That in order to be able to reconstruct the original analogue signal, a minimum number of samples had to be taken†.It could be stated as: Fs > 2(BW) Fs = Sampling frequency BW = Bandwidth of original analog voice signal Quantizing and Coding This basically means the converting of each of the analogue sample into a discrete value (in the form of a binary code) that can be given a digital code word. It is done by assigning each sample a certain quantization interval. The instantaneous amplitude is been rounded off to certain levels, this thereby introduces some uncertainties (quantization noise).This is given by this expression; Number of levels = 2 ^ Bn (Bn is the number of bits used in the encoding) It was proven from the experiment that the higher the number of quantization levels the lesser the amount of quantizing noise. However this process of increasing the quantizing level to lower the quantizing noise introduces complexity into the system as the PCM system would need to be able to handle more code word. Companding It is a word derived from the combination of compressing and expanding. This is another stage in pulse–code modulation. It is a process of compressing a given analogue signal and this signal is expanded to its original size on getting to destination. In this process, the input signal is compressed into logarithmic segments and then quantized and coded. The more the signals increase the more the compression increases. Since the larger signals are compressed more than the smaller signals, the quantization noise increases. This indirectly keeps the SNR (signal to noise ratio) constant. EXPRERIMENTATION AND OBSERVATION Apparatus Oscilloscope PCM ENCODER module Connection cable The experiment was carried out by sending an input (analogue message) into the PCM ENCODER module. This input is constrained to a defined bandwidth and amplitude range in order to make sure the Nyquist criterion is observed. The PCM ENCODER module looks like the diagram below: A suitable encoding scheme for the analogue sample is selected. For example a 4-bit or 7-bit encoding scheme. The analogue signal is fed through the Vin. For this experiment, the clock rate us 8.33 kHz TTL signal from MASTER SIGNAL module. Time frame is also very essential as each binary word is located in a time frame. It’s 8 clock periods long and has 8 slots of equal length (i.e. 0 – 7). The LSB (consisting of 1’s and 0’s) are embedded in the encoder itself. This is useful in determining the location of each frame in the data stream. Initially the 4-bit linear coding scheme is selected and patched up with the 8.33 kHz TTL sample clock.CH-2A displays the clock signal on the oscilloscope. The display below shows a 4-bit PCM output for zero amplitude input; Quantization in PCM ENCODING is the next stage after sampling. The quantization level is rather transmitted instead of the sample value. The quantization levels are binary coded (i.e. binary ‘1’ in the presence of a pulse and binary ‘0’ in the absence of a pulse) RESULTS AND OBSERVATION The output of the variable DC is connected to Vin and sweeping the DC voltage slowly forward and backward shows discrete jumps in the data pattern, e.g. The maximum voltage is recorded as -2.51V.Also increasing the amplitude of the DC input signal looks like the diagram below; Changing the DC voltage from the maximum to minimum gave a range of binary code variations as listed below; The following measurements were later made after recording the quantizing levels and associated binary numbers; Sampling rate – 16.6 kHz Frame width – 950 µs Width of a data bit 120 µs Width of a data word 480 µs Number of quantizing level – 16 From the measurement above it could be concluded that the quantizing levels are linearly spaced .The same process would be applicable to a 7-bit linear encoding using the toggle switch on the front panel, though it would take longer than the 4-bit linear encoding done earlier. The Companding stage in a PCM is the process by which an analogue signal is been compressed at the source and then expanded back to its original size when it gets to its destination. During this process, the signal is compressed into segments which are quantized using uniform quantization. As the sample signal increases, the compression increases (i.e. the larger samples gets more compressed than the smaller samples). The standard of companding used in this experiment is the A-law .The equation is; Where A = 87.7 in Europe and X is the normalized integer to be compressed. RESULTS AND OBSERVATION The toggle switch is changed back to a 4-bit companding and the TIMs A4 companding law pre-selected is selected from the switch board. This gave the measurement below; In PCM decoding, the TIMs PCM DECODER module is used for decoding. This is the first operation in the receiver towards regenerating the received pulses. Amplitude of the pulse generated is the linear sum of all pulses in the coded word. In other to be able to recover the information on the PCM decoder, the knowledge of the sampling rate used to encode the signal is essential. RESULTS AND OBSERVATION The setup is similar to the earlier setup with CH-1A connected to the scope selector to the PCM output of the PCM ENCODER.A large negative DC is used for the message, the alternating ‘0’ and ‘1’ bits produced are measured to be 1920ms apart. The 4-bit linear decoding scheme is now selected to carry out the decoding process. The 8.33 kHz TTL signal is stolen from the transmitter and connected to the clock input. Time division multiplexing (TDM) is an alternative to the method of multiplexing using frequency sharing. Each channel is allocated a specific time slots, and each slots contain frames which must be repeated at the sampling rate. It can only be used for pulsed signals and not for analogue signals because they are continuous in time. The importance of TDM is that it enables many independent signals to be transmitted. RESULTS AND OBSERVATION A PCM TDM signal could be generated using PCM ENCODER; each driven by the same clock ( one the MASTER and the other SLAVE).Interconnecting in this way eliminates other frames and gives room for the two output to be added together to form the TDM signal. The display on the oscilloscope is shown below; The connection of the MASTER and the SLAVE generates the diagram below; Patching up the two PCM data outputs generates the display below; The next step which is shown below is to confirm that the frame synchronization bit is a ‘1’ for the MASTER and ‘0’ for the SLAVE The last stage of this experiment is to separate the two messages that have been multiplexed earlier. The PCM demodulator is patched up, with each module receiving the same clock stolen from the transmitter and each module also receives an external FS signal. The diagram below confirms the two messages have been recovered and appear at the correct outputs; CONCLUSION Pulse Code Modulation is however a very effective way of conveying audio signal by sampling the signal and transmitting binary coded pulse representing the sample values. It has emerged the most favored modulating scheme for transmitting analogue information such as voice and video signals. The advantages of PCM over the other forms of modulation (e.g. analogue modulation) are; PCM suppresses wideband noise. It is effective in the regeneration of the coded signal along the transmission path. It enables digital multiplexing. It enables the efficient exchange of increased channel bandwidth for improved signal-to-noise ratio. All these advantages however come at the expense of increased system complexity and increases channel bandwidth. REFERENCES http://www.webopedia.com/TERM/P/PCM.html [last accessed 25/03/08] http://cbdd.wsu.edu/kewlcontent/cdoutput/TR502/page13.htm [last accessed 25/03/08] http://www.cisco.com/warp/public/788/signalling/waveform_coding.pdf [last accessed 25/03/08] http://www.comlab.hut.fi/opetus/245/2004/09_PCM.ppt#20 [last accessed 25/03/08] Rodger E.Ziener and William H.Tranter, â€Å"Principles of Communication†, Chapter 3, John Wiley and sons, NY, 2002. Simon Haykin, â€Å"Communication Systems†, Chapter 3, John Wiley and sons, NY, 2001. David Petersen, â€Å"Audio, Video and Data Telecommunications†, Chapter 2, McGraw-Hill, Cambridge, 1992.

Watsons Theory of Caring Essay -- Nursing

Watson’s Theory of Nursing We live in a fast moving environment with longer tiring days. When we are ill we go to the doctor’s office or emergency room and expect fast and reliable service. Data is collected that is measuring satisfaction from the service and, of course that data helps to improve the service. Companies keep track of statistics, like income, housing, children, and cars. I also like numbers and statistics, and like the idea that everything can be measured and have a number associated with it. However, I am wondering if everything can be quantified. Can we reliably measure happiness, love, and care of one person for another? Attempts are made to quantify happiness in some countries, Bhutan and Great Britain, to name a few. Consider health care, we are counting admissions, discharges, hospital-days, and patient satisfaction scores, but this statistic does not reflect how a patient feels. How often was the patient scared, depressed and lonely in his statistical hospital room somewhere betwe en his admission and discharge? Did anyone care about this person? Watson's theory of caring concentrates on human aspect of nursing and gives nurses opportunity to connect and to care for patients. Background of Watson’s Theory of Caring Watson admits that her original intent was not to create a theory; she was only trying to solve some conceptual and empirical problems with nursing education, practice, and research. Her 1979 book, Nursing: The Philosophy and Science of Caring, was, in fact, an essay on nursing (Watson, 1999). Over 30 years, from 1979 to 2008, Watson develops and finalizes her Theory of Caring. She starts with her textbook for an integrated nursing curriculum at the University of Colorado. The theory starts wi... ...e. Easier, of course, to perform assigned task, but we know that in human interaction and especially in health care many more factors affect the outcome but not just well performed task. Watson’s theory gives a special attention and concentrates on the humanistic aspect of nursing. Works Cited Alligood, M. R., & Tomey, A. M. (2006). Nursing theory: Utilization & application (3rd ed.). St. Louis, MO: Mosby Elsevier. Cross, P. (1981). Adults as learners . Washington, DC : Jossey-Bass, a subsidiary of John Wiley & Sons . Watson, J. (1988). Nursing: Human science and human care. New York: National League for Nursing. Watson, J. (1999). Nursing: Human science and human care: A theory of nursing. Sudbury, MA: NLN Press, Jones and Bartlett Publishers. Watson, J. (2008). Nursing: The philosophy and science of caring. Boulder, CO: University Press of Colorado.

The Killer Angels Book Review

I believe that the author wrote this book because he wanted people to view the Battle of Gettysburg from not Just the view point that we receive in our textbooks but from different points of views so that we may interpret the battle as a whole instead of bits and pieces. This book, in my opinion, was written for both informative and entertainment for those who enjoy learning about history and the Civil War. This novel began with a person spying on the Union army then goes back to report o General Longest that he had found that an Union army was seen moving nearby where he was located.When the spy told Longest that information, it seemed to shock him a little bit. In Longitude's mind he believed that another general, General Stuart, was supposed to be tracking the Union army's movement. Now that he has received this information, he thought that he should move the Confederate army north to cut off the Union army. While heading north, the Confederate's come across a small town in Pennsy lvania known as Gettysburg. While patrolling the town of Gettysburg on his horse, a Union general had noticed that the Confederate soldiers were close.The general who saw the confederate army, General Afford, was under the impression that the two armies would start to battle inside the town. So he set up to brigades along the hills outside of town. His way of thinking was that the higher ground the Union army was, the better it was to fight the Confederate army. He believed using the geography of the north was a good idea. I agree with his thinking because it is certainly an advantage when it comes to warfare. As General Afford is aging arrangements to make that happen, General Longest was meeting with other generals to discuss strategy and tactic.The book then turns to the date of July 1st. It starts as General Lee is waking up and discovering General Stuart absence from camp. Without the absent man, Lee had no idea where the Union army was located and that troubled him. Not knowin g where the enemy was is never a good thing because you have no idea what your next plan or step would be. While at camp, he met with Longest. Longest was confident that the Confederates can use defensive tactics that has helped them in revises battles to help them win this one.He believes that the Confederacy would have a much better chance of winning because of their defensive skills that have proven to be top notch. General Lee refused Longitude's way of thinking because he wanted to smash the Union army aggressively in one blow. The book then transitions to where the battle was beginning when the confederate soldiers attacked the men who were station amongst the hills due to Brood's command. Reinforcements soon arrived to help out Brood's men since they were getting killed.The reinforcement quad was led by General Reynolds whom was later killed in the battle. As Lee arrives to the battleground, the battle is in full swing. He is ordering his men to attack since some Union troops were coming from the South to help out. As the first day ends, Union forces retreated back into the hills to take cover and get some rest for the upcoming day when they would continue to battle. Longest becomes nervous because he knew that the hills were a good defensive position. He knew that they would have the advantage if they went to attack them within the hills.He was also ware that General Lee would attack them instead of retreating to another location and wait for them to attack. On the second day of the battle, Chamberlain is the one who makes the first move this time by moving toward Gettysburg once again. As they were walking, they discovered an escaped slave. This gets Chamberlain into thinking about the reasoning for this war that has caused so many causalities of fellow Americans and what he believed in about different races. While that was happening, two confederate generals were suggesting to lee that they should attack the opposing army to weaken it.Lee likes the p lan, but Longest still wants to move to another location. Once again Lee had refused. As Lee and Longest lead the troops toward the hills, they discover that the army has come off of the hills and into the lowland where an orchard of some sort lied. They attack which causes a blood bath. Chamberlain and his men had to hold the ground against the Confederate attacks, but eventually they run out of bullets. They had followed by a motto to never retreat and fight while standing their ground. As day two came to an end, Lee decided on a Lana for the next day.As the final day approaches, Longest, for the final time, tries to convince Lee to move the army to another location, but Lee again refuses. Lee was determined to attack his enemy at this certain place. Longest had tried to convince him but he refused while launching an attack known as Picket's charge. After the failure of Picket's charge, the Confederates soon retreated, and the Battle of Gettysburg had finally come to an end. Perso nally, I believe Michael Sahara is the type of person who found this battle to be absolutely fascinating.I also believe that the author had done his research on the matter by using personal letters of these generals and other primary sources to help him write this book. This novel is an excellent example of a bloody battle fought on the US soil between the people of the US. To be honest, I really enjoyed this book. I like who the point of views changed to get the full coverage the battle and to have an insight on what was actually happening. I also happen to love learning about wars and the presidents so that helped a lot knowing some outside information.

Math 213 Reflective Paper - 839 Words

Reflective Paper - Math 213 Math 213 is a class packed full of information valuable to the development of a professional math teacher. There were several major mathematical concepts addressed in the class ranging from problem solving, numeration systems and sets, whole numbers and their operations, to algebraic thinking, integers and number theory, rational numbers as fractions, decimals and real numbers, and proportional reasoning, percents, and applications. This class enhanced my understanding of math in general, as well as enabled me to explore strategies on how to best present mathematical concepts in an elementary classroom setting. Since children learn differently than adults do, and do not have prior knowledge to†¦show more content†¦It is up to teachers to give students the skills to set up and solve algorithms that will help to build their math confidence and motivate them to expand on what they have learned. Teaching the concept of integers and number theory is a fundamental part of math curriculum. The ability of a professional mathematics teacher to tie in real world experiences, using hand on activities and manipulatives is essential in enabling students to build on mathematic ideas and understand how they interconnect. Also important is the concept of rational numbers as fractions, decimals, and real numbers. Teachers need to help ease the transition from whole numbers by clearly explaining the new rules and definitions students are unfamiliar with. By teaching the importance of ratios, proportions, proportional reasoning, percents, and their real life applications, teachers are giving students the skills they need to become productive members of society. Proportional reasoning is one of the big ideas in math and if students are able to grasp this concept, they will be able to apply it in many instances in their lives. 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