Definition: A digital modulation technique that allows data transmission by changing the frequency of the carrier wave according to the digital modulating signal is known as frequency shift keying (FSK). It is the most straightforward and efficient digital signal transmission scheme. Theory of Frequency Shift Keying The simplest form of FSK is Binary frequency shift keying (BFSK). Here, the frequency of the carrier wave changed between discrete binary values of the modulating signal. Thus, … [Read more...] about Frequency Shift Keying – FSK
Amplitude Shift Keying – ASK
Definition: A digital modulation technique in which the amplitude of the carrier wave is altered according to the modulating signal (bitstream) is known as Amplitude Shift Keying (ASK). It is the easiest and straightforward digital modulation scheme. ASK is sometimes known as On-Off keying because the carrier wave swings between 0 and 1 according to the low and high level of input signal respectively. Theory of Amplitude Shift Keying In ASK, frequency and phase of the carrier wave is kept … [Read more...] about Amplitude Shift Keying – ASK
Digital Instruments
Definition: The instruments that are used to express the measuring quantity in numeric format is known as Digital Instruments. A digitized information is somewhat easy to be handled and transmitted thus widely preferred nowadays. Quantization is the basis of working of a digital instrument. It is an act of transforming an analog signal into its digital form. Digital instruments are composed of logic circuits that carry out measurement of the quantities. Due to several advantages of … [Read more...] about Digital Instruments
Optical Amplifier
Definition: Optical amplifier is a device used in an optical communication system to directly amplify (boost) optical data signal without changing it into its electrical form. By making use of Optical amplifiers in optical fiber communication, the optical integrity of the whole system is retained. Need of Optical amplifier During signal transmission, it is necessary to employ amplifiers within the network in order to have a distortionless data signal. When we talk about an optical … [Read more...] about Optical Amplifier
Difference Between LED and OLED
The crucial difference between LED and OLED is that LED does not work on the principle of self-illumination as it needs a backlight for its operation. As against OLED is a self-illuminating type device as it does not require a backlight in order to initiate its operation. Another major difference between LED and OLED is that a wider viewing angle is noticed in the case of OLED. At the same time, black level is more dominant in OLED as compared to LED. We will discuss some more important … [Read more...] about Difference Between LED and OLED
Difference Between CRT and LCD
The crucial difference between CRT and LCD exist in their image forming technique. CRT displays image on the screen by making use of electron beam, however, LCD utilizes liquid crystals for the formation of an image on the screen. Another major difference that exists between CRT and LCD is their size and dimension. CRT monitors are thicker and heavier but small in size than that of LCD. We will discuss some other important differences between CRT and LCD but before that have a look at the … [Read more...] about Difference Between CRT and LCD
Difference Between Copper Cable and Fiber Optics
The crucial difference between copper cable and fiber optics is that copper cable transmits signal in the form of electrical pulses while fiber optics possess signal transmission in the form of light pulses. Another major difference between copper cable and fiber optics lies in their name itself. A copper cable is made of copper wire. As against fiber optics is formed by single or multiple strands of glass fiber. Before proceeding further, have a look at the rough draft towards the … [Read more...] about Difference Between Copper Cable and Fiber Optics
Difference Between Modulation and Demodulation
The major difference between modulation and demodulation is that modulation is the act of altering the parameters of the carrier signal according to message signal for convenient data transmission. On the contrary, demodulation is done in order to recover the original message signal from a modulated signal. Another crucial difference between modulation and demodulation is that modulation is done at the transmitting end while demodulation occurs at the receiving end. Both modulation and … [Read more...] about Difference Between Modulation and Demodulation
Difference Between Encoder and Decoder
Both encoder and decoder are combinational logic circuits, however, one of the crucial difference between encoder and decoder is that an encoder provides binary code as its output. On the contrary, a decoder accepts binary code as its input. An encoder is a device that converts the active data signal into a coded message format. However, a decoder performs inverse operation of the encoder and thus converts the coded input into original data input. In order to have secured data … [Read more...] about Difference Between Encoder and Decoder
Difference Between Active and Passive Transducer
The major difference between active and passive transducer is that an active transducer has the ability to convert one form of energy into another form (electrical) without using an external source of power. On the contrary, a passive transducer converts a form of energy into another (electrical) by making use of an external source of power. Active transducers are also known as self-generating transducers while passive transducers are known as externally energized transducers. We will … [Read more...] about Difference Between Active and Passive Transducer