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Q. What is a Modem?
Modems are generally used to interface digital circuits to transmit information on analogue channels such as telephone systems. Modem (from modulator-demodulator) is a device which modulates an analogue carrier signal to encode digital information and also demodulates such a carrier signal to decode transmitted information. The goal is to produce a signal which can be transmitted easily and decoded to reproduce original signal data. Modems can be used over any means of transmitting analog signals. Two main modulation schemes are currently being used to implement ADSL: carrier less amplitude/ phase (CAP) a single carrier modulation scheme which is based on quadrature amplitude modulation (OAM); and discrete multi-tone (DMT), a multichannel modulation scheme. Choice between them naturally relies on how well they perform in the presence of impairments on existing copper twisted -pair access cabling (see side bar), as these can limit the transmission capacity. Furthermore high bit rate services carried by ADSL mustn't interfere with other services. Essentially multicarrier modulation superimposes a number of carrier modulated waveforms to represent input bit stream. Transmitted signal is the sum of these sub-channels(or tones)that have same band width and equally spaced centre frequencies. The number of tones should be large enough to make sure good performance. Practically a value of 256 provides near optimum performance while ensuring manageable implementation complexity.
A 3-phase, wye-connected, 11.8 kV, 100 MVA turbo- generator of 0.8 power factor lagging has a synchronous reactance of 2.0 p.u. on rating. The generator is driven by a steam turbin
1.) A three phase, D0 HP, 1765 rpm, BA0 V induction motor operating at three quarter load has an efficiency of 91% and a power factor of 87%. Determine active power, apparent pow
This project is about another particular application of a particular embodiment of the patent: A Long Stroke Steam Engine using Solar Generated Steam. The machine elements such as
Explain Microprocessor development system. Microprocessor development system: Computer systems consist of undergone many changes lately. Machines which once filled large area
Q. Use the node-voltage method to find the current I through the 5- resistor of the circuit of Figure.
Unsolved numerical
matlab code for handwritten digital
A 3 phase, 6 pole induction motor is rated at 400hz, 150v, 10h.p., 3% slip at rated power output. The windage and friction loss is 200w at rated speed. With the motor operating at
Byte have 8 combinations of bits.
What is 16-bit ISA? Compare it with 8-bit ISA bus. The only difference among the 8 and 16-bit ISA bus is that other connector is attached behind the 8-bit connector. This 16-bi
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