What are frequency spectra?
Word forms: (plural) frequency spectra. (Electrical engineering: Circuits, Communication) The frequency spectrum of an electrical signal is the distribution of the amplitudes and phases of each frequency component against frequency.
What is pulse train in communication?
The pulse train refocuses the direction of precession and creates an effective field that is the product of a square wave and the AC field.
Why do we use frequency spectrum?
Spectrum is a range of electromagnetic radio frequencies used for transmission of voice, data and images. Mobile telecom operators send and receive frequencies to enable communication between two phones. The defence services and railways also use the spectrum .
What is pulse output signal?
A pulse output signal is a typical method of measurement for electricity, water or gas meters. It’s likely that the meters in your own home will use pulses to define the amount of energy, water or gas passing through them at any given time.
What is the importance of frequency spectrum?
Having more spectrum helps operators to deliver this better user experience. In particular, aggregating spectrum into larger downlink carriers raises peak data speeds but also more generally helps to provide the higher average speeds valued by many users.
What is periodic pulse train?
A periodic impulse train consists of impulses (delta functions) uniformly spaced T0 seconds apart. An application of a periodic impulse train is in the ideal sampling process. Using (3.28), an even periodic impulse train, as shown in Figure 3.21b, can be analytically expressed as follows: (3.31)
What is frequency in PWM?
Frequency as it relates to PWM is the number of times per second that we repeat the on and off cycle (figure 2). If we pulse the solenoid on and off at a given duty cycle 30 times a second, we have a frequency of 30 Hz.
How is the frequency spectrum divided?
The spectrum is divided into different frequency bands, each having a specific application. For instance, the frequency band that covers 300 kHz to 535 kHz is reserved for aeronautical and maritime communications and the spectrum from 520 kHz to 1700 kHz for AM radio. This process is called “allocation”.
What is the frequency of a Gaussian pulse train?
The pulse repetition frequency is 1 kHz, the sample rate is 50 kHz, and the pulse train length is 25 ms. The gain factor is a sinusoid of frequency 0.1 Hz. Plot the periodic Gaussian pulse train.
How often does a pulse train occur?
The pulses occur every 25 seconds and have exponentially decreasing amplitudes. Specify the generated pulse as a prototype. Generate three pulse trains using the default linear interpolation method, nearest neighbor interpolation and piecewise cubic interpolation.
What is the frequency at which the train is sampled?
The train is sampled at 2 kHz for 1.2 seconds. The pulses occur every third of a second and have exponentially decreasing amplitudes. Initially specify the generated pulse as a prototype.
How are pulse trains generated in electronic circuits?
These electronic pulse trains are typically generated by metal–oxide–semiconductor field-effect transistor (MOSFET) devices due to their rapid on–off electronic switching behavior, in contrast to BJT transistors which slowly generate signals more closely resembling sine waves. ^ a b c Reid, Gordon (February 2000).