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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 do electromagnetic waves carry sound as electrical signals?
The electromagnetic wave is "modulated" (changed) to represent the signal. For example, in AM (amplitude modulation), the strength (amplitude) of the wave is increased or decreased, according to the signal.
Which type of electromagnetic wave is used to produce a thermogram?
To produce thermogram it needs infrared wave. It is a radiant energy which cannot be seen by naked eyes and it was discovered by Sir William Herschel, an astronomer in the year 1800.
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 are two stimuli skin detects?
it detects: Heat and Cold.some other stimuli the skin detects are: Roughness, smoothness, and pain.
Discussion about amplitude demodulator?
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 the difference if any between the demodulator part of a modem and coder part of a codec?
A coder can accept any kind of analog signal while demodulator can only accept a modulated sine wave. Then they generate the digital signal.
What is the difference if any between the demodulator part of a modem and the coder part of a codec?
A coder can accept any kind of analog signal while demodulator can only accept a modulated sine wave. Then they generate the digital signal.
Am demodulator diode detector circuit?
demodulator circuit is a circuit which is used for remove all high frequency components from modulated signal.
What is a demodulator?
The process of separating the original information or SIGNAL from the MODULATED CARRIER. In the case of AMPLITUDE or FREQUENCY MODULATION it involves a device, called a demodulator or detector, which produces a signal corresponding to the instantaneous changes in amplitude or frequency, respectively. This signal corresponds to the original modulating signal
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 amplitude demodulator?
(I am assuming you want to know what an "AM Demodulator" is, as follows) AM stands for Amplitude Modulation, perhaps the most basic kind of modulation of a radio carrier wave. Information, typically voice or music, is impressed on a radio carrier by simply varying the strength or 'amplitude' of the carrier (which is ordinarily at a much higher frequency than the information signal) versus time. An AM Demodulator, then, is a device which recovers the original signal, that is the voice or music, from the modulated carrier wave after it has been transmitted from the source to the receiver (which typically filters and amplifies the received signal before it is applied to the demodulator). The simplest AM Demodulator is a simple "diode", a 2 terminal semiconductor (or vacuum tube) device which, together with another filter, can convert the AM modulated carrier directly into the original form, discarding the carrier wave in the process. This is known as an "Envelope Detector". Other types of AM Demodulators exist, principally the "Product Detector". See the subtopic "AM Radio" in the Wikipedia entry for "Demodulation" for a little more information (it's not overly technical).
How the modem change the analog signal?
MODEM stands for modulator/demodulator. Outgoing it modulates a carrier wave with information and transmits this data on a wire or through the air. When it receives a modulated signal it demodulates the signal and separates out the information.
What is demodulation of laser beam?
Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a modulated signal with specific characteristics, which must be returned to base-band. There are several ways of demodulation depending on what parameters of the base-band signal are transmitted in the carrier signal, such as amplitude, frequency or phase. For example, for a signal modulated with a linear modulation, like AM (Amplitude Modulated), we can use a synchronous detector. On the other hand, for a signal modulated with an angular modulation, we must use an FM (Frequency Modulated) demodulator or a PM (Phase Modulated) demodulator. Different kinds of circuits perform these functions. A demodulator is an electronic circuit used to recover the information content from the carrier wave of a signal.[1] The term is traditionally used in connection with radio receivers, but many other systems use many kinds of demodulators. Another common one is in a modem, which is a contraction of the terms modulator/demodulator. Many techniques -- such as carrier recovery, clock recovery, bit slip, frame synchronization, rake receiver, pulse compression, Received Signal Strength Indication, error detection and correction, etc. -- are only performed by demodulators, although any specific demodulator may perform only some or none of these techniques.
What are two essential components of a modulated wave?
amplitudefrequencyphase
What is demodulation in communication?
recovering the information content from modulated carrier wave
What parameter of a sine wave carrier can be modulated?
Amplitude, Frequency and Phase
