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Amplitude, Frequency and Phase
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What is difference between modulated wave and carrier wave?
Carrier Wave: A carrier wave is a high-frequency electromagnetic wave that is used as the "carrier" or the base signal in a modulation process. It is typically a pure sine wave with a constant frequency and amplitude. The carrier wave by itself does not carry any information; it serves as a vehicle to carry the information from one location to another. In AM and FM radio broadcasting, the carrier wave is the primary signal transmitted by the radio station. Modulated Wave: A modulated wave is the result of combining the carrier wave with an information signal, such as an audio signal or data. Modulation is the process of varying the characteristics of the carrier wave (either its amplitude or frequency) in accordance with the information signal. There are two common types of modulation: Amplitude Modulation (AM) and Frequency Modulation (FM). In AM, the amplitude of the carrier wave is varied in proportion to the amplitude of the information signal. This variation encodes the information onto the carrier wave. In FM, the frequency of the carrier wave is varied in proportion to the amplitude of the information signal. This variation encodes the information onto the carrier wave. The modulated wave contains the information that needs to be transmitted, and it can be demodulated at the receiving end to retrieve the original information.
How does demodulator detects modulated wave?
A demodulator detects a modulated wave by separating the modulating signal from the carrier wave. This is done by reversing the modulation process applied to the carrier wave to extract the original signal that was modulated onto it. Different demodulation techniques are used depending on the modulation scheme employed.
What is demodulation in communication?
recovering the information content from modulated carrier wave
Why the carrier for the amplitude modulation must be a sinusoidal waveform?
The wave in amplitude modulation must be a sine wave. A sine wave represents smooth repetitive oscillation, which is necessary for this process.
What do you understand by modulation?
Modulation is a word applied to anything that varies in level. Brake pads are modulated in an anti lock braking system. The human voice can be modulated whilst singing to give a pleasing sound An audio signal can be superimposed upon a carrier wave in broadcasting. The carrier wave is amplitude modulated by the audio signal.
What is the meaning of suppressed carrier in am?
radio an amplitude-modulated wave in which only the sidebands are transmitted, the carrier being removedhttp://dictionary.reference.com/browse/suppressed+carrier+modulation
How does a wave carrier affect what you hear on the radio?
The carrier wave carries the information that you hear. It is modulated by the sound which varies its amplitude or frequency. Without the carrier there would be nothing to vary so you would hear nothing.
What are the different Types of radar?
radars are of two types pulsed and continuous wave radar. pulsed radar has its carrier pulse modulated used for detecting stationary objects continuous radar uses direct sine wave for transmitting and is used for moving targets there are types such as weather, and aircraft.
What is a modulated carrier waves?
A modulated carrier wave is the output of a modulator that includes the information of the signal that is applied to the carrier.When a signal typically a piece of music in the range of say 30Hz to 30KHz is applied to an AM modulator (not sure about FM or PM) with a carrier of say 3MHz the output consists of 4 packetsUpper Sideband (Carrier + Signal) 3.000003MHz to 3.03MhzLower Sideband (Carrier - Signal) .297MHz to .299997MHzCarrier 3MHzSignal 30Hz to 30KHzEither sideband in the case of Single Side Band (SSB) or Both (.297MHz to 3.03Mhz) in the case of Double Side Band (DSB) could be referred to as modulated carrier waves
What is the meaning of modulated wave?
Modulation is where an electronic signal (base) is combined with another electronic signal (carrier).The base could be audio, video or digital. The carrier is the frequency that a receiver (radio or television) is tuned to.The modulated wave is the result of this combination.
How can a carrier wave carry information?
A carrier wave is a waveform (usually sinusoidal) that is modulated with an input signal for the purpose of conveying information. Its purpose is usually either to transmit the information through space as an electromagnetic wave (as in radio communication), or to allow several carriers at different frequencies to share a common physical transmission medium by frequency division multiplexing.
What is phase discriminator?
A phase discriminator is a circuit or device used to compare the phase difference between two input signals. It is often used in communication systems to demodulate or recover the original signal from a modulated carrier wave by detecting the phase difference between the carrier wave and the modulated signal.
