2019年6月30日星期日

THE DIGITAL REVOLUTION: ITS ADVANTAGES AND DISADVANTAGES | SOUKACATV.COM


The Digital Revolution is the newest economic revolution. Like the Industrial Revolution, the Digital Revolution marks a complete shift in our society, signals a new era, and alters many aspects of our lives. While not everyone is familiar with the term, the Digital Revolution refers to the shift from technology based on analog and mechanical electronics to digital technology.
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Digital technology allows information to be copied and replicated precisely. It is due to digital technology that our society is now so defined by computers, smart phones, internet access, and cell phone communication. The Digital Revolution, in fact, marks the beginning of a new age: the Information Age.
Advantages
It isn’t hard to see the advantages of the Digital Revolution. You probably benefit from it every day. In fact, if you are reading this article, then you are experiencing one of the benefits of the Revolution – it vastly increases the knowledge at our fingertips, expanding our understanding of the world, and compiling entire encyclopedias of knowledge in online databases. Consider some other advantages of this Revolution:
·         The Digital Revolution links individuals and groups together. Never before have we been able to communicate real-time with others in distant corners of the world. And this advantage is not limited to international communication – we now have instant access to our friends and family members a few miles away. Unlike traditional telephones, cell phones have brought this ‘communication power’ into our hands in the most remote locations.
·         The Digital Revolution has created tools that are catalysts for sharing ideas. No longer do you need to be the executive of a wealthy business in order to share your thoughts with others on a broad scale – using social media and common technologies, ideas can be shared and innovation can be accelerated.
·         Similarly, we now have a world of online opportunity. Start-up companies can begin in a bedroom with a single laptop. Jobs can be obtained – and worked – in the back of a truck deep in the forest. You can find and purchase rare books through online services without getting out of bed.
·         While not all may appreciate it, the Digital Revolution forces competitiveness on a global scale. Prior to the revolution, stores only needed to compete with other stores in their region. A book may not have been the best book on the subject, but only needed to be the best book that the library had. Now, the level of competition is global. If this competitiveness hurts smaller, less efficient and lower-quality entities, it allows us, the consumers, access to a far wider marketplace of goods and knowledge.

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Disadvantages
While we can all recognize and appreciate the powerful advantages that the Digital Revolution brings to our fingertips, I write this article primarily so that we would recognize the disadvantages that tag along. The Digital Revolution has become such an ubiquitous part of our lives that we may hardly notice the damaging effects that it brings along. My point is not to focus on those clear and obvious evils such as hackers and organized crime that are so obvious – you probably already understand those problems. Rather, consider how the Digital Revolution can bring about such disadvantages on a personal and societal level:
·         You and I are gifted beyond measure to live in an age when so much knowledge is available, but as I have previously described, people abuse this wealth of knowledge in three ways: (1) by only wishing to be acquainted with many things, (2) by turning its blessing into a curse, and (3) by wishing to know only for the sake of knowing. (You can read more about the abuse of knowledge here).
·         By opening up so much knowledge to us – and presenting it at our fingertips – the Information Age allows evil to spawn and grow at an alarming rate. From the questionable to the perverted, from the dubious to the depraved, the same information can be presented to us instantly and transit the globe in moments, without allowing society time to sit back and consider the information or ideas that are offered to us.
·         A whole family can now live in a single house and yet live like single people, because this Revolution breaks down many relationships and our sense of community. While we can maintain friendships in distant states and countries, it breaks down all those friendships which are not actively fostered in the digital realm. When you get on a bus or train full of people on their smartphones, it reveals this sad truth: that everyone is connected, but only to those whom they chose to connect with.
·         Similarly, digital technology breaks apart our sense of political and regional community. This has been in decay for some time now, but the Information Age is tearing it apart faster than ever. The idea that we can choose our friends through social media, and stay connected with only those – without spending time with those who live and interact around us – tears down the idea that we live in a community, in a special place in the world. It tears down the idea that we need our neighbors on a political level, which prepares for the abuse of democracy.
·         Finally, the digital realm encourages passivism, rather than discernment. Having information presented on a screen (as it constantly is in the Information Age) welcomes viewers to sit back, accept the message that is presented, and move on without time for reflection. While movies and media all communicate messages, digital electronics have a strange way of obscuring that fact and encouraging passive consumerism. Television has been around for some time, but only multiply the problem.
Like fire, electronics make a handy servant but a dangerous master. Or, as we could alter the phrase, ‘Electronics make a stultifying master but an astonishing servant.’ When they dominate our lives, they encourage us to sit back, stop thinking, and grow ignorant and disconnected. When we harness them as a servant, then electronics are some of the most beneficial tools ever known to man.
Established in 2000, the Soukacatv.com main products are modulators both in analog and digital ones, amplifier and combiner. We are the very first one in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world.
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CONTACT US
Company: Dingshengwei Electronics Co., Ltd
Address: Bldg A, the first industry park of Guanlong, Xili Town, Nanshan, Shenzhen, Guangdong, China
Tel: +86 0755 26909863
Fax: +86 0755 26984949
Mobile: 13410066011
Email: ken@soukacatv.com

Source: fromdanielsdesk


















































2019年6月27日星期四

Difference between Amplitude Modulation and Frequency Modulation | Soukacatv.com


Amplitude Modulation and frequency modulation, both are the type of transmission techniques for transmitting information from sender to receiver. But the similarity between the two ends here. Amplitude modulation involves the modulation of the carrier signal according to the amplitude of the baseband signal. The frequency and phase of the carrier signal remain constant.

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On the contrary, frequency modulation involves the modulation of the carrier signal according to the frequency of the baseband or information signal. Thus, the major difference between the amplitude modulation and frequency modulation is that the amplitude modulation is the process of modulating the amplitude of the carrier signal, while frequency modulation is the modulation of the frequency of the carrier signal.
Another significant term which creates the difference between these two modulation techniques is the bandwidth requirement. The bandwidth requirement in case of amplitude modulation is very less as compared to frequency modulation.
We will discuss some other crucial differences between amplitude modulation and frequency modulation like frequency range, quality of transmission etc. with the help of comparison chart. But before discussing the comparison chart, let’s put light on the crucial cornerstone of this article.
Content: Amplitude Modulation and Frequency Modulation
1.     Comparison Chart
2.     Definition
3.     Key Differences
4.     Conclusion

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Comparison Chart
PARAMETERS
AMPLITUDE MODULATION
FREQUENCY MODULATION
Definition
The amplitude of the carrier wave is modulated according to the value of the amplitude of the information signal.
The frequency of the carrier wave is modulated according to the value of the frequency of the information signal.
Circuit designing
Simple
Complex
Cost of the circuit
It is less costly.
It is more costly than amplitude modulation technique.
Bandwidth requirement
The bandwidth requirement is low in the range of 10 kHz.
The bandwidth requirement is high in the range of 200 kHz.
Area of reception
The area of reception is large.
The area of reception is limited in comparison to that of amplitude modulation system.
Constant terms
The frequency and phase is constant.
The amplitude and phase is constant.
Power
The wastage of power is more in amplitude modulation because the significant part of the power is carried by the carrier signals which do not contain any information.
The power is utilized properly, because all transmitted power is carried by the information signal.
Noise Immunity
The amplitude modulation system is not immune from noise distortion as frequency deviation technique and amplitude delimiters cannot be utilized in amplitude modulation system.
The frequency modulation is more immune to noise distortion because we can use frequency deviation technique and amplitude delimiters.
Quality of reception
Low quality signal is obtained.
The received signal is of high quality.

Definition of Amplitude Modulation
The amplitude modulation is the process of transmitting the information signal by superimposing it on the high-frequency wave called carrier wave. The information signal can be of any type based on the type of information it is carrying such as voice, data etc.
The frequency of the information signal which is also known as the baseband signal is extremely low. The frequency of the signal is directly related to the energy of the signal. Thus, if signal frequency is very low then the signal will get attenuate after travelling a certain distance. In order to avoid the attenuation of the signal, it is superimposed on the high-frequency carrier wave.
In case of amplitude modulation, the amplitude of the carrier wave modulates, i.e. it varies with the amplitude of the information signal. Thus, the modulation is called amplitude modulation. It is to be noted that the frequency and the phase of the carrier remain constant during amplitude modulation.
The main drawback of the using amplitude modulation technique is the lower efficiency and poor quality. The modulated signal obtained from amplitude modulator does not resemble the transmitted signal as its quality gets degraded. Besides, the noise immunity of amplitude modulators is also poor.
The advantage of using amplitude modulation technique is that it requires low bandwidth which makes it less costly.
Frequency Modulation
The frequency modulation is the technique of modulation in which the frequency of the carrier signal is varied in accordance with the frequency of the information or baseband signal keeping the amplitude of carrier signal constant.
The frequency modulator performs the modulation task, in this carrier signal from radio frequency generator and the information signal from the information source is introduced. The modulated signal is then passed to RF amplifier which ameliorates the necessary attenuations.
The main advantage of using the frequency modulation technique for transmission is that quality of the transmitted signal does not deteriorate. But the frequency modulation system is complex to design thus, the cost of such system are quite high.
The frequency modulation system is immune to noise distortion. Thus, the effect of noise on the frequency modulated signal is extremely low that it can be neglected.

Key Differences between Amplitude Modulation and Frequency Modulation
1.     The operation mechanism of amplitude modulation and frequency modulation creates the key difference between these transmission technologies. Amplitude modulation deals with the carrier which is modulated by the amplitude of the signal, while frequency modulation technique deals with the carrier which is modulated by the frequency of the modulated signal.
2.     The quality of the received signal varies in both the techniques. The amplitude limiters can be fitted with frequency modulation system. Thus, the distortions due to noise signal can be minimized in frequency modulation system. On the contrary, the amplitude modulators cannot be equipped with amplitude limiters.
3.     The frequency deviation technique also reduces the noise and can exponentially increase the quality of the signal, but the technique of frequency deviation is not possible in amplitude modulation. This makes the frequency modulation better in comparison to amplitude modulation.
4.     The bandwidth requirement also plays a pivotal role in differentiating amplitude modulation and frequency modulation. The frequency modulation system requires high bandwidth in the range of 200 kHz. While the amplitude modulation system requires bandwidth in the range of 10kHz for the broadcasting information signals.
5.     The circuit architecture of frequency modulation system is very complex in comparison to amplitude modulation system.
6.     The amplitude modulation and frequency modulation also differs in the cost of the system. The complex design of the frequency modulation system makes it costly in comparison to amplitude modulation system.

Conclusion
The amplitude modulation and frequency modulation, both are the crucial technologies of the communication system. Our requirements and specification of applications decide which of the above-mentioned modulation technique should be used. If we are dealing with such an application in which we cannot compromise with the quality of reception, then we should opt for frequency modulation system.
However, if we are dealing with such an application that we needn’t maintain the quality of the reception and looking for the cheap and simple technique then we should go for amplitude modulation technique.
Established in 2000, the Soukacatv.com main products are modulators both in analog and digital ones, amplifier and combiner. We are the very first one in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world.
For more, please access to https://www.soukacatv.com.

CONTACT US
Dingshengwei Electronics Co., Ltd
Company Address: Building A, the first industry park of Guanlong, Xili Town, Nanshan, Shenzhen, Guangdong, China
Tel: +86 0755 26909863
Fax: +86 0755 26984949
Phone: +86 13410066011
Email:ken@soukacatv.com
Skype: soukaken

Source: electronicscoach