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What is need of space vector pulse width modulation?
due to space vector modulation we can eliminate the lower order harmonics
What is difference between modulator and demodulator?
Modulation is used when information is available in analog form that varies the frequency and/or amplitude of a lower frequency wave, depending on the information it carries. The role of modulation is to place this information onto a carrier frequency that can be transmitted more readily and with least loss of information. There are three fundamental types of modulation - frequency modulation, amplitude modulation and phase modulation. In each of these, a carrier frequency is modulated by a lower frequency, to form a modulated carrier wave. A modulator modulates the carrier frequency, while a demodulator detects the modulation on the carrier wave and recovers the original lower frequency waveform at the destination. For many years the modulated carrier wave was converted to a radio signal. Now it is often an electrical signal which is sent down a teleohone line; the information is usually a set of pulses going between computers. When computers are connected to each other in a two-way conversation, the MOdulator and DEModulator are combined into a single device called a MODEM.
What is positive and negative modulation?
in order to transmit the video signal amplitude modulation is used. the composite video signal has distinct polarity of black and white levels in the picture.1.positive modulation :- in this type of modulation, increase of brightness toward white causes increase in carrier amplitude peak white has 100% modulation while black and sync level have lower and minimum modulation respectively2.negative modulation :-in this type of modulation,the sync tip level are at 100%.blanking level correspond to black is at 75%and increase in brightness toward white causes decrease in carrier amplitudeNegative modulation is preferred over positive modulation because impulse interference is difficult to deal with and random increase in signal is similar to existing sync pulse.these interference result in generation of black spot and white blobs.
What is signal bandwidth?
Every line has an upper limit and a lower limit on the frequency of signals it can carry. This limited range is called the bandwidth. The signals ranging within the upper limit & lower limit are called bandwidth signals.
What are the advantages and disadvantages of phase modulation?
Advantage - 1. Phase modulation & demodulation is easy compared to Frequency modulation. 2. Phase modulator is used in determining velocity of moving target by extracting Doppler information. Doppler information needs stable carrier which is possible in phase modulation but not in frequency modulation. Disadvantage - 1. Phase ambiguity comes if we exceed its modulation index pi radian(180 degree). 2. we need frequency multiplier to increase phase modulation index. Visit my website http://harshit.org
What has lower energy AM or FM?
AM (Amplitude Modulation) signals generally have lower energy compared to FM (Frequency Modulation) signals. This is because FM signals typically have a greater bandwidth and utilize a wider range of frequencies, allowing them to carry more power and provide better sound quality. Additionally, FM's method of encoding information through frequency changes tends to be more resilient to noise and interference, making it more effective for broadcasting.
How does DSB SC modulation reduce power?
DSB SC (Double Sideband Suppressed Carrier) modulation reduces power consumption by eliminating the carrier wave from the transmitted signal, which typically requires a significant portion of the total power. In this method, only the sidebands, which contain the actual information, are transmitted, leading to more efficient use of power. This results in a lower average power requirement for signal transmission, making DSB SC modulation particularly advantageous for power-sensitive applications.
When you do modulation in time domain you get modulated waveform of modulating signal information and carrier. How can you recognize the upper and lower side bands in time domain modulated waveform?
You need modulation signal(carrier) which is a required signal in order to make envelope of time domained signal(target signal). The modulating signal is imposed on modulation signal.This creates envelope of waveform which is modulated(desired) signal. Now, the desired signals uper and lower sideband of signal strictly depends on modulation signal's bandwidth. Max. peak of that signal is uper sideband and min. peak is lower sideband for this modulated signal.
What is an AM transmitter?
Aplitude ModulationAn AM transmitter is a Amplitude Modulated transmitter where the amplitude of the Radio Frequency signal is modulated, usually used in the lower frequency bands where the frequency is to low for Frequency Modulation (FM), it was the first type of modulation used in radio communication FM was developed in the late 1950's and is not sensitive to static interference as AM AnswerAM is Amplitude Modulation that is the RF signals amplitude is modulated with the audio signal. this modulation is done because the audio signal being of low frequency cannot be transmitted to longer distance so the audio signal is amplitude modulated with RF signal and then transmitted into the air
What are benefits of analog modulation technique?
Analog modulation techniques offer several benefits, including simplicity in implementation and ease of understanding, making them suitable for various applications. They typically require less complex equipment than digital modulation, which can result in lower costs for transmission systems. Additionally, analog modulation can provide better performance in terms of signal quality over short distances and is effective for continuous signals, such as audio. However, it is generally more susceptible to noise and interference compared to digital modulation.
What type of transmission is indicated by the term NTSC?
NTSC was the standard used in the US (and some other countries) for transmitting analog color television signals in a backward compatible manner with the original US black and white television signals (developed in 1939 by RCA). It has been superseded by the ATSC digital television standard.It uses the following systems of modulation:vestigial lower sideband amplitude modulation of main carrier with the black and white video signalfrequency modulation of a 4.5MHz subcarrier with the audio signalphase modulation of a 3.58MHz subcarrier with the color signal
What is modulation why do we need modulation?
Sometimes we have to send low frequency information, like the tone of the voice of someone talking on a telephone, over a specific channel that only permits a specific high frequency, such as radio frequencies (RF). So how do we do that? One simple, cost effective, and bandwidth efficient method is to change, or modulate, a known RF signal a certain way. Some common ways of modulating such a high frequency signal are Amplitude Modulation and Frequency Modulation. Each of these modulation techniques has its own advantages and disadvantages and are therefore more useful in certain applications.
What is need of space vector pulse width modulation?
due to space vector modulation we can eliminate the lower order harmonics
What is an infection transmitted by a hypodermic needle transmitted by?
lower down
Do microwaves carry am signals?
They can - any "radio waves" can carry any kind of modulation, so long's the frequency is a few hundred kilohertz or more - lower frequnecies can be modulated, but the rate of data is so slow it may not be worth the effort.
3 How is digital radio different than the types of radio that came before It?
The way the signal is transmitted and processed. FM radios are transmitted via signal generators and amplifiers on the ground while digital radio like Sirius or AM are transmitted via satellites. The digital signals are sent in packets vs. lower frequency radio waves.
What does AM andFM mean?
AM stands for Amplitude Modulation, a method of transmitting signals by varying the amplitude of the carrier wave. FM stands for Frequency Modulation, which transmits information by varying the frequency of the carrier wave. Both are techniques used in radio broadcasting, with AM typically having a longer range but lower sound quality, while FM offers better sound quality and resistance to interference.
