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The operations of power electronic converters are mainly based on the switching of power semiconductor devices. Due to this the converters introduce voltage and current harmonics into the source as well as load. These harmonics can cause problems of distortion in the output voltage and current and also electromagnetic interference with the neighboring systems. To reduce these harmonics to an acceptable level it is necessary to introduce filters on the input and output of the converter. To evaluate the performance of the converter the quality of the waveform (voltage and current) needs to be measured using factors such as total harmonic distortion (THD), harmonic factor (HF) and input power factor (IPF). The implementation of proper control algorithm in the controller, generation of harmonics and distortion in the output waveform can be reduced. The switching of the power devices in power electronic converter can cause radio frequency interference due to electromagnetic radiation as a result gating circuits may generate erroneous control signals. This interference problem can be avoided by the use of grounded shielding.
Transaction processing systems
to maintain the constant frequency and the phase parameters at the output
The biggest disadvantages with oscillators are that they have to be stabilized with control heaters. If the oscillator is operated in a non temperature controlled environment it will drift off frequency and it is not good policy to transmit over a wider that necessary bandwidth. The frequency on either side of the offending transmitter will be affected.
As low as possible to as high as possible, but don't go just by frequency response. Anything by Sony or sennheiser are normally good. A good unknown brand I found were Urbanz. Decent frequency response is generally anything from 20Hz and lower to 25KHz and higher. For example, 10Hz to 28kHz is decent. Some professional headphones (such as professional sennheisers) boast 3Hz to 50kHz, but unless you are a music producer this is rarely necessary. Hope this has helped :)
modulation is necessary for transmitting low frequency signal to long range with desired qualitative information
Basic, important, central, crucial, major, necessary, vital, or significant. Those a synonyms for fundamental.
Basic, important, central, crucial, major, necessary, vital, or significant. Those a synonyms for fundamental.
Electro magnetic radiation in the range of 60Mhz to 1000Mhz frequency necessary to cause a nucleus to spin flip ie the resonance frequency.
fundamental essential vital key necessary
Necessary :)
Why is it necessary that health workers have a basic understanding of the fundamental principles of maintaining a healthy body (50—75 words)?
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vital, necessary, crucial, needful, essential, basic, key, fundamental
to quickly and effectively represent data
AnswerAll of the popes have made it a fundamental objective to spread Christianity.
The transmitting signal bandwidth is much wider than would normally be necessary to transmit the information Some influence other than the information being transmitted is used to determine the transmitting bandwidth