The alteration of hte amplitude, intensity, frequency, or phase (of the carrier wave of a radio signal) at intervals, so as to represent information to be transmitted.
Impressment of information on a carrier signal by varying one or more of the signal's basic characteristics: frequency, amplitude and phase.
In relation to typography, modulation means the usually cyclical and predictable variation in width of the stroke. In unmodulated letterforms, such as Helvetica, the stroke is always fundamentally the same width. In a Renaissance face such as Bembo or Garamond, the stroke is based on the trace of a broad nib pen, which makes thin cross strokes and thicker pull strokes. When letters are written with such an instrument, modulation automatically occurs.
The process of one audio or control voltage source influencing a sound processor or other control voltage source. Example: Slowly modulating pitch cyclically produces vibrato. Modulating a filter cyclically produces wa-wa effects.
When some characteristics of an electromagnetic wave are deliberately changed or manipulated for the purpose of transmitting information. Process by which signals are transformed to represent information (or data). Generally uses different frequencies to transmit data (FM). See also QAM.
Changing a radio signal so that it transmits an audio signal. When a receiver picks up the modulated signal, it converts it back into the original audio signal.
Converting digital signals into analog signals. A modem is a MOdulator/DEModulator.
Modulation refers to the process of encoding digital data into analog signals for transmission. When transferring data over phone lines, for example, a modem modulates the data into audible tones "carried" on frequencies between 0 Hz and 4 KHz. Once the data reaches its intended destination, another modem demodulates the signal back into digital data.
By definition, modulation is "change." In music technology and synthesis, the term refers to a control signal used to change some parameter of another signal; for instance, a control signal, or voltage, may be used to change, or modulate, the pre-delay time in a reverb processor. In broadcasting, FM (frequency modulation) and AM (amplitude modulation) are both techniques using one parameter of a wave (in FM, the frequency; in AM, the amplitude) to change the waveform of an audible signal, called the carrier.
any of the methods used to superimpose intelligence onto a radio signal, or " carrier" signal. Types include AM, FM, SSB, et al.
The process of converting a digital computer signal into an analog telecommunications signal.
The process that changes the characteristics of a single-frequency carrier wave to convey information such as voice or data. The amplitude, frequency or phase of the carrier wave is varied in step with the instantaneous value of a complex, or modulating, wave (or samples of it).
Alterations in the characteristics of carrier waves, usually impressed on the amplitude and/or the frequency, for the purpose of transferring information.
Varying elements of electrical carrier waves in a manner that represents signal data. Demodulation restores the signal data. A modulated signal requires more bandwidth and an unmodulated signal does. The bandwidth increase results from the creation of sidebands during modulation. The sidebands contain the signal. AM creates two, identical sidebands on either side of the carrier. FM creates an infinite number of sidebands.
To change the wave and frequency characteristics of a signal through the use of another signal.
Process by which the characteristics of electrical signals are transformed to represent information. Types of modulation include AM, FM, and PAM. See also AM, FM, and PAM.
Manner in which information is coded into light for transmission through a fiber. Modulation method may be either pulse modulation (digital) or intensity modulation (analog).
The process of modifying the amplitude, frequency or phase of a carrier wave by a modulating signal.
The application of information onto a carrier signal by varying one or more of the signal's basic characteristics (frequency, amplitude or phase), or the process of converting a signal from its original format into one that that can be transmitted over a given carrier signal. Specific types include the following (see separate entries):• AM (amplitude modulation)• ADPCM (adaptive differential pulse code modulation)• FM (frequency modulation)• PAM (pulse amplitude modulation)• PCM (pulse code modulation)
The conversion of a digital signal to its analog equivalent, especially for the purposes of transmitting signals using telephone lines.
When some characteristics of an electromagnetic wave are deliberately changed or manipulated for the purpose of transmitting information (see Amplitude Modulation, Frequency Modulation and Phase Modulation)
Process of varying some characteristics of the carrier wave in accordance with the instantaneous value or samples of the intelligence to be transmitted.
The process by which some characteristic of a high-frequency carrier signal is varied in accordance with another, a lower frequency "information" signal. This technique is used in modems to make business-machine signals compatible with communication facilities.
The process of modifying an RF carrier signal to produce sidebands for conveying audio or video signal information over great distances.
To superimpose the amplitude, frequency or phase of a wave or signal onto another wave or signal, which is then used to convey the original signal via a transmission medium (e.g. satellite link).
The imposing of a signal on some type of transmission or storage medium, such as a radio carrier or magnetic tape. Impressing a signal onto a carrier frequency for transmission purposes. In video, a Modulator is a section within a VTR that changes the frequency of the video signal information coming in from an external source to signal information that is compatible with the requirements of the VTR heads, while keeping the picture information basically unchanged.
The process of changing some parameters of an information carrier, in sympathy with the information, so that it can be transmitted over the air.
Variation of a wave. See amplitude modulation and frequency modulation.
a pulsing of a signal changing the tone, frequency, phase, amplitude or any other feature of a system to convey a message. This is where the "mod" in modem comes from (the "dem" stands for demodulate, the reverse that happens at the far end to put the desired signal back in its original format).
Used to impress an information source (intelligence) onto a transmitter's carrier signal. Carriers are used to match the transmitted signal to the bandpass characteristics of the transmission medium
The process of adding information in the form of an analog signal to an existing signal carried by a transmission medium; i.e., a carrier. The added signal effectively &147;rides along&148; the transmission signal.
The process by which audio signals are impressed on an RF carrier.
Cyclical variations in the frequency and / or amplitude of a cycle.
The process of varying the amplitude, frequency, or phase of an RF carrier wave.
variation of the frequency, phase or magnitude of a high frequency waveform in accordance with a waveform of lower frequency
The process of superimposing an information signal onto a carrier for transmission.
The process of moving a signal's spectrum to a different frequency band centred on some chosen frequency called the carrier frequency, in order to facilitate transmission over a medium. Close this window
Variation of the amplitude (voltage), frequency or phase of a radio wave, in order to carry information such as voices, pictures, music or data.
Converting binary or digital data into an analog signal that can be sent over standard telephone lines.
Modulation is the process by which some characteristics of the message signal are varied in accordance with the modulating wave.
Combining a lower frequency, the modulation, with a higher frequency, the carrier.
a change of key within a composition. octave: an interval in which the higher of two tones vibrates at exactly double the frequency of the lower. On the piano and other instruments, the closest interval between any two consecutive notes with the same letter name, i.e. "C to C" and "G to G"
The process of changing or regulating the characteristics of a carrier wave so that the variations represent meaningful information.
The shifting or translation of a signal from one frequency band to another is accomplished by the process of modulation.
1. The process or the result of the process by which some characteristic of one wave is varied in accordance with some characteristic of another wave (AM, amplitude modulation; PM, phase modulation; FM, frequency modulation). 2. The action of a control valve to regulate fluid flow by varying the position of the closure component.
The method of putting intelligence on a radio signal.
The process of converting a signal from its original DC voltages to a form that can be transmitted by radio. Also see demodulation.
Literally, modulation is change. In music technology, the term normally applies to a control signal being used to change some aspect or parameter of another signal. For example, a regularly repeating sine waveform might be added to a pitched note to produce vibrato, or a control voltage might be used to change (modulate) a filter cutoff frequency. A whole category of synthesis (and radio broadcasting), FM (frequency modulation), is based around using the frequency of one signal (the modulator) to change the frequency of another audible signal (the carrier). Likewise, AM radio works because of amplitude modulation, or using one signal's volume to modulate another signal.
The variation in amplitude of a signal with time. The presence of modulated noise has a significant effect on sound quality of exhaust tailpipe noise.
Process of modifying a signal into a signal that is more suitable for transmission over another medium.
A term referring to the ability of a VCXO to be voltage controlled using a time-varying signal.
A controlled variation of any property of a carrier wave for transferring data.
is the process of impressing information on a carrier for transmission. Various types include Amplitude Modulation (AM), Phase Modulation (PM), and Frequency Modulation (FM).
The analog waveform of a transmitted digital signal.
A process in which a message is added or encoded onto a carrier wave. Among other methods, this can be accomplished by frequency or amplitude modulation, known as AM or FM, respectively. (QAM,QPSK,OFDM)
The modification of the characteristics of a signal so that it might carry the information contained in another signal.
The ability to superimpose an external signal on the output beam of the laser as a control.
The methods of altering the signal between reader and transponder (tag) in order to carry the encoded information. In some cases, different modulating techniques are used in each direction (to and from the tags). The various methods include
Usually, a transmitter converts the electrical signal into a form suitable for transmission through the physical channel or transmission medium. As an example, the Federal Communications Commission (FCC) specifies the frequency range for each transmitting station. General modulation of the signal relates to matching the message signal with the channel. There are several ways of modulating the signal, including amplitude, frequency and phase.
In DVD, signal modulation refers to the process by which the bits representing user data are converted to the modulation refers to the process by which the bits representing user data are converted to the modulation code bits recorded on the disc. This process increases reading accuracy and reduces crosstalk between primary signal information and tracking servo mechanism pits on the disc. DVD utilizes an eight-to-sixteen modulation system that creates a slightly larger buffer between streams of digital information ensuring a high measure of accuracy in signal processing.
The process of coding and decoding information for transmission. For example, a voice conversation is coded into binary bits (digital information), transmitted and then decoded at the receiving end. Back to the top.
Placing information, audio/video, onto a higher frequency carrier by means of amplitude, frequency or phase adjustment.
Changing the frequency or amplitude of a wave to transmit data that is converted into digital form. For example, a wave with the normal amplitude (or height) may be a one in binary code and a wave with a lower amplitude might be a zero.
A variance in the amplitude or frequency of a signal. The variance can be used to transmit information.
The process by which some characteristic (i.e., amplitude, phase) of one RF wave is varied in accordance with another wave (message signal).
The carrying of baseband signal (information) by a carrier for efficient delivery across a transmission medium. If a carrier is modulated by the baseband signal, the carrier wave shape changes in accordance with the variation in a characteristic (i.e. amplitude, frequency, or phase) of the baseband signal. Contrast with demodulation.
The variation of a property in an electromagnetic wave or signal, such as amplitude, frequency, or phase. Through modulation of carrier waves, data is encoded and transmitted in an RFID system.
the process in which a bitstream is converted to a waveform compatible with a transmission channel
Replacing patterns of bits with different (usually larger) patterns designed to control the characteristics of the data signal. DVD uses 8/16 modulation, where each set of 8 bits is replaced by 16 bits before being written onto the disc.
the process of varying the amplitude, frequency or phase of a carrier or signal
The methods of altering the carriers in order to carry the encoded information are quite varied. They include amplitude modulation (AM)/ phase modulation (PM), frequency modulation (FM), frequency shift keyed (FSK), pulse position (PPM), pulse duration (PDM) and continuous wave (CW).
Altering the characteristics of a carrier wave to convey information. Modulation techniques include amplitude, frequency, phase, plus many other forms of onoff digital coding.
This term typically refers to AM (amplitude modulation) or FM (frequency modulation). It is the manipulation of the amplitude (in AM) or frequency (in FM) of a carrier wave in a way that corresponds to the data, video, or voice signal.
The conversion process of digital data to analogue data.
Superimposing an information signal onto an RF carrier by varying some aspect of the carrier. There are three fundamental types of modulation; amplitude modulation, phase modulation, and frequency modulation.
The process of imposing an information signal on a carrier. This can be done by changing the amplitude (AM), the frequency (FM) or the phase, or any combination of these.
Process by which an information signal (audio for example) is used to modify some characteristic of a higher frequency wave known as a carrier (radio for example).
The process of manipulating the frequency or amplitude of a carrier in relation to an incoming video, voice or data signal.
A process whereby a signal is transformed from its original form into a signal that is more suitable for transmission over the medium between the transmitter and the receiver.
The process whereby an electrical carrier wave is altered to facilitate the transmission of a signal.
The process by which the characteristics of a carrier wave are varied in accordance with a message signal (voice, data or video). Analogue satellite transmission commonly uses FM modulation. A digital satellite transmission commonly uses QPSK modulation.
The process of modifying some characteristic of a wave (the carrier) so that it varies in step with the instantaneous value of another wave (the modulating wave) in order to transmit a message. The modified characteristic may be frequency, phase, and/or amplitude.
The process of manipulating the frequency or amplitude of a carrier in order to convey information in the form of video, voice or data signals.
The process of modifying a carrier signal to transmit information.
Modulation is the process where by varying certain parameters of the carrier signal, in other words, a signal that is suitable for the modulation of the information signal by means of an alternative signal (the information bearing or modulating signal).
Any of several techniques for combining user information with a transmitter's carrier signal.
the transmission of a signal by using it to vary a carrier wave, changing the carrierâ€™s amplitude or frequency or phase. The process in which electrical encoding or modulation is used to format the information according to the transmission medium.
Changing the characteristics of a sound wave. In audio frequency, modulation is known as phasing or flanging, amplitude modulation is referred to a tremolo.
The process or result of changing data into information carrying signals for transmission and/or recording.
The process by which some characteristic of a higher frequency wave is varied in accordance with the amplitude of a lower frequency wave.
The process by which information is impressed upon a high frequency carrier signal for relay purposes.
The process of varying the characteristic of the carrier wave as the information to be transmitted. There are three basic types of modulation which are Amplitude, Frequency and Phase Modulation.
The 3 types of modulation relevant to the operation of model aircraft are AM - Amplitude Modulation, FM - Frequency Modulation, and PCM - Pulse Coded Modulation. NACA 4-Digit Aerofoils The first digit represents the maximum camber [as a % of the chord] while the second digit [x10] refers to its location behind the leading edge [as a % of the chord]. The third and fourth digits combined relate to the maximum section thickness [also as a % of the chord]. A NACA 2412 section therefore has 2% maximum camber located 40% from the leading edge and is 12% thick. NACA 5-Digit Aerofoils The first digit [x0.15] gives the design lift coefficient while the second and third digits [x0.5] give the location of maximum camber [as a % of the chord]. As with the 4-Digit series, the third and fourth digits combined relate to the maximum section thickness [also as a % of the chord]. A NACA 23012 aerofoil therefore has a design CL of 0.3 with its maximum camber at 15% chord from the leading edge and is 12% thick.
The process of adding an information signal to a carrier frequency to allow it to be transmitted. Thus, the carrier is modulated by the information signal, as in a modem.
Coding of information onto the carrier frequency. This includes amplitude, frequency, or phase modulation techniques.
The method of converting digital data to an analogue signal for the purpose of transmission over telephone a line by using ADC and DAC principles. The device responsible for this usually is a modem, short for modulator/demodulator. See also Data, Modem, ADC and DAC.
In photoelectrics, modulation of an emitter means to turn it on and off at a high frequency (typically several kilohertz). The secret of a modulated sensor's superior performance is that the sensor's receiver and amplifier are tuned to the frequency of modulation. Only the modulated light is amplified, and all other light which reaches the receiver is ignored.
The process by which some characteristics of one carrier wave are varied in relation to another wave or signal.
The process whereby some characteristic of a carrier is varied in accordance with some characteristic of the signal to be carried (e.g., the frequency of the carrier can be varied according to the amplitude of the signal).
The process, or results of the process, whereby some characteristic of one signal is varied in accordance with another signal. The modulated signal is called the carrier. The carrier may be modulated in three fundamental ways: by varying the amplitude, called amplitude modulation; by varying the frequency, called frequency modulation; by varying the phase, called phase modulation.
is the process of imposing information on carrier signal by varying some parameter of the carrier. The parameters that can be varied are the amplitude, frequency or phase. MPEG
Modulation is the method by which a high-frequency digital signal is grafted onto a lower-frequency analog wave, so that digital packets are able to ride piggyback on the analog airwave.
Modulating a signal means you are changing that signal in some repetitive or cyclic fashion.
The way the electronic control information is sent from your transmitter to the receiver through radio waves.
The alteration of a carrier wave in relation to the value or samples of the data being transferred.
the periodic variation of the radiation from the light source, either electronically or mechanically with a chopper, at frequencies between 30 and 200 Hz. Modulation of the light source allows the instrument to discriminate against other sources of radiation that might reach the detector and bias the absorbance measurement.
Changing the radio waves traveling between the reader and the transponder in ways that enable the transmission of information. Waves be changed in a variety of ways that can be picked up by the reader and turned into the ones and zeroes of binary code. Waves can be made higher or lower ( amplitude modulation) or shifted forward (phase modulation). The frequency can be varied (frequency modulation), or data can be contained in the duration of pulses (pulse-width modulation).
Encodes digital or analog signals on a different waveform. Adapts the signal to a different frequency range than that of the original signal.
specific way of coding information on a radio frequency. Basically, there is amplitude modulation (AM - change waveform strength) and frequency/phase modulation (FM - change waveform timing), but there exist many variations and combinations each designated by a specific acronym.
Modifying some characteristics of a wave form.
describes a range of techniques for encoding information on a carrier signal, typically a sine-wave signal. A device that performs modulation is known as a modulator.
1. In general, the modification of some property of a phenomenon by another distinct phenomenon. 2. In radio, radar, sodar, and lidar, the modification of the amplitude, phase, or frequency of a carrier to convey information or to permit resolved measurements at particular range, frequency, or velocity intervals.
The act of changing the shape of a carrier sine wave by combining it with a signal of changing frequency, phase or amplitude.
The process of sending a control signal to a sound source so as to change the character of the sound.
The process of converting voice or data signals for transmission over a network. Also called line coding.
A way in which one signal modifies or controls another signal for such purposes as enabling it to carry information. Often used to describe radio frequency (RF) transmission. FM is a frequency modulation; AM is amplitude modulation.
The process of impressing intelligence upon a transmission medium, such as radio waves.
The process by which the characteristic of one wave (the carrier) modifies another wave (the signal). Examples include amplitude modulation (AM), frequency modulation (FM), and pulse-coded modulation (PCM).
Changing the frequency or size of one signal by using the frequency or size of another signal.
Converting signals from a binary-digit pattern [pulse form] to a continuous wave form [analog]. Contrast with demodulation.
The coding of information onto the carrier Frequency. Modulation means include (among others) amplitude, Frequency, or phase pulse many forms of on-off Digital coding.
Conversion of data bits to channel bits that normally enhances storage capacity and minimizes low frequency components of recorded information that might interfere with servomechanism functions.
The process of adding a signal to a carrier to transmit information. Can be used in reference to voice communications, but refers to digital data in the context of packet radio. (See demodulation, modem.)