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The act or process of modulating. Music a. A passing or transition from one key or tonality to another. A change in stress, pitch, loudness, or tone of the voice; an inflection of the voice. Electronics The variation of a property of an electromagnetic wave or signal, such as its amplitude, frequency, or phase.

Electrical Engineering electrical engineering a. See also amplitude modulationfrequency modulationphase modulationvelocity modulation. Switch to new thesaurus. FMfrequency modulation - modulation of the frequency of the radio carrier wave. Mentioned in?


References in periodicals archive? DataDrill upgrades to Evolution 3. And for all the left-field criticism of his "dress sense" and alleged lack of links to the business community, I can only speak as I find and say that been in his presssing a BUSINESS said all the righty impressive delivbe said of all sen-"learning on the s doesn't always ials in the loop - g wrong with that ut he has a demod is bright with an genda with some stance, not least earheading the Great Western Cites initiative.

Lads, just bury the hatchet and look at our city's bigger picture; Business Editor Sion Barry on why it's time for Phil Bale and Russell Goodway to shake hands and come together to boost Cardiff plc. Major Murray informed JED that "the plan is to demod the system when returned to Depot," and that there is "no current requirement to modify any additional systems with this capability. Predators flew with target designators over Kosovo.

EC Monitor. Dictionary browser? Full browser?By using this site, you agree to the Privacy Policy and Terms of Service. In most cases, MicroStrain calibrates every DVRT with its accompanying electronics and provides a detailed calibration certificate. The certificate provides 3 methods of calibration and all the particulars including formulas to resolve voltage into engineering units.

The output is an analog DC voltage proportional to linear displacement. The analog voltage is easily read using a multi-meter or DAQ. A Micro-D connector with color-coded wire pigtail is provided and is designed to complete the run to a DAQ. In a word, no. LORD Sensing develops and manufactures wireless sensor data acquisition systems, inertial sensors, micro-displacement sensors, and software for a wide range of custom and embedded applications. International Distributors Contact. Reps Blog.

Where to Buy? International OEM. List Price:. Contact Sales for volume pricing. Does carbon fiber affect the analog output from the DVRT? No, carbon fiber has not been shown to pose a problem. Standard Least Squares Linear Fit provides a simple mathematical method to convert sensor output to displacement and delivers reasonable accuracy. Polynomial Fit provides a more mathematically intensive method to convert sensor output to displacement and in turn delivers a high degree of accuracy.

A possible drawback to some users of this method may be that it can not accurately report measurements beyond its stroke length i.


Multi-Segment Linear Fit provides the most mathematically intensive method to convert sensor output to displacement, delivers a high degree of accuracy and is not subject to the drawback of over-stroking. What's the output from the DVRT?

Are DVRTs calibrated? Please use the form below to contact us or call Contact Us.Add demoed to one of your lists below, or create a new one. In English, many past and present participles of verbs can be used as adjectives. Some of these examples may show the adjective use. Heads-ups and wake-up calls! The language of warnings. Definitions Clear explanations of natural written and spoken English.

Click on the arrows to change the translation direction. Follow us. Choose a dictionary. Clear explanations of natural written and spoken English. Word Lists. Choose your language. My word lists. Tell us about this example sentence:. This is a good example of how the word is used.

The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit. Your feedback will be reviewed. They've just completed a Christmas single and are also demoing lots of new songs. Synonyms present. See also demonstrate. Showing and demonstrating. Examples of demoed.


Omega caught the attention of technology media with impressive specifications and seemingly serious investor and consumer information, but the operating system was never demoed publicly.

From Wikipedia. The band says there is an album's worth of material demoed. These examples are from the Cambridge English Corpus and from sources on the web.

Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Two were demoed just two weeks before the recording sessions began.By using this site, you agree to the Privacy Policy and Terms of Service. LORD Sensing develops and manufactures wireless sensor data acquisition systems, inertial sensors, micro-displacement sensors, and software for a wide range of custom and embedded applications.

International Distributors Contact. Reps Blog. Where to Buy? International OEM. List Price:. Contact Sales for volume pricing.

High Performance Precision synchronous demodulation Differential amplifier raises AC voltages and provides optimum demodulator performance Paired and calibrated with each DVRT sensor for high accuracy outputs Line voltage transient filtering and constant current excitation source to the sensor bridge Easy to Use Factory-adjustable output filtering and calibration-model options to match application needs Rapid warm-up time Analog backplane available for connection optimization Cost Effective Complete position-sensing solution with no integration to other systems required Volume discounts.

There are no downloads for this product. Please use the form below to contact us or call Contact Us.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.


If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Firstly it was written in C last commit to C versionhowever now it is rewritten in rust. Notice that here modified multimon-ng is used that supports sps input stream for fsk decoder. Read here why multimon-ng must be modified instead of converting demod output to native format.

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Latest commit Fetching latest commit…. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Mar 13, Sep 27, May 21, Jun 24, Amplitude modulation AM is the modulation method used in the AM radio radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially to the radio receiver.

Click the link for more information. In this system the intensity, or amplitude, of the carrier wave varies in accordance with the modulating signal. When the carrier is thus modulated, a fraction of the power is converted to sidebands sideband, any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i. If the modulated carrier is rectified see rectifier rectifier, component of an electric circuit used to change alternating current to direct current.

Rectifiers are made in various forms, all operating on the principle that current passes through them freely in one direction but only slightly or not at all in the opposite This form of modulation is not a very efficient way to send information; the power required is relatively large because the carrier, which contains no information, is sent along with the information.

In a variant of amplitude modulation, called single sideband modulation SSBthe modulated signal contains only one sideband and no carrier. The information can be demodulated only if the carrier is used as a reference.

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This is normally accomplished by generating a wave in the receiver at the carrier frequency. SSB modulation is used for long-distance telephony such as in the amateur radio bands and telegraphy over land and submarine cables.

In frequency modulation FMthe frequency of the carrier wave is varied in such a way that the change in frequency at any instant is proportional to another signal that varies with time. Its principal application is also in radio, where it offers increased noise noise, any signal that does not convey useful information.

Electrical noise consists of electrical currents or voltages that interfere with the operation of electronic systems. The FM band has become the choice of music listeners because of its low-noise, wide-bandwidth qualities; it is also used for the audio portion of a television broadcast. Digital radio digital radio, audio broadcasting in which an analog audio signal is converted into a digital signal before being transmitted; also known as digital audio broadcasting DAB and high-definition radio.

Each signal travels within its own unique frequency range carrierwhich is modulated by the data audio, video, etc. Orthogonal frequency-division multiplexing OFDM takes this concept further, separating an individual transmission into multiple low-frequency signals with a high resistance to interference. A further extension of the technology, coded orthogonal frequency-division multiplexing COFDMis widely used in Europe and elsewhere where the digital audio broadcast DAB standard has been adopted.

Phase modulation, like frequency modulation, is a form of angle modulation so called because the angle of the sinewave carrier is changed by the modulating wave. The two methods are very similar in the sense that any attempt to shift the frequency or phase is accomplished by a change in the other. Pulse modulation involves modulating a carrier that is a train of regularly recurrent pulses.

The modulation might vary the amplitude PAM or pulse amplitude modulationthe duration PDM or pulse duration modulationor the presence of the pulses PCM or pulse code modulation.


PCM can be used to send digital data; audio signals on a compact disc compact disc CDa small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44, times a second, then each sample is measured and digitally encoded on the 4 in 12 cm disc as a series of Developed in by the English inventor Alec H. Reeves, pulse code modulation is the most important form of pulse modulation because it can be used to transmit information over long distances with hardly any interference or distortion; for this reason it has become increasingly important in the transmission of data in the space program and between computers.

Although PCM transmits digital instead of analog signals, the modulating wave is continuous. Digital modulation begins with a digital modulating signal. See C.In electronics and telecommunicationsmodulation is the process of varying one or more properties of a periodic waveformcalled the carrier signalwith a modulating signal that typically contains information to be transmitted. Most radio systems in the 20th century used frequency modulation FM or amplitude modulation AM for radio broadcast.

A modulator is a device that performs modulation. A demodulator sometimes detector or demod is a device that performs demodulationthe inverse of modulation. A modem from mo dulator— dem odulator can perform both operations.

The aim of analog modulation is to transfer an analog baseband or lowpass signal, for example an audio signal or TV signal, over an analog bandpass channel at a different frequency, for example over a limited radio frequency band or a cable TV network channel.

Analog and digital modulation facilitate frequency division multiplexing FDMwhere several low pass information signals are transferred simultaneously over the same shared physical medium, using separate passband channels several different carrier frequencies. The aim of digital baseband modulation methods, also known as line codingis to transfer a digital bit stream over a baseband channel, typically a non-filtered copper wire such as a serial bus or a wired local area network.

The aim of pulse modulation methods is to transfer a narrowband analog signal, for example, a phone call over a wideband baseband channel or, in some of the schemes, as a bit stream over another digital transmission system. In music synthesizers, modulation may be used to synthesize waveforms with an extensive overtone spectrum using a small number of oscillators.

In this case, the carrier frequency is typically in the same order or much lower than the modulating waveform see frequency modulation synthesis or ring modulation synthesis. In analog modulation, the modulation is applied continuously in response to the analog information signal. Common analog modulation techniques include:. In digital modulation, an analog carrier signal is modulated by a discrete signal.

Digital modulation methods can be considered as digital-to-analog conversion and the corresponding demodulation or detection as analog-to-digital conversion.


The changes in the carrier signal are chosen from a finite number of M alternative symbols the modulation alphabet. A simple example: A telephone line is designed for transferring audible sounds, for example, tones, and not digital bits zeros and ones. Computers may, however, communicate over a telephone line by means of modems, which are representing the digital bits by tones, called symbols. If there are four alternative symbols corresponding to a musical instrument that can generate four different tones, one at a timethe first symbol may represent the bit sequence 00, the second 01, the third 10 and the fourth Since each tone i.

According to one definition of digital signal[ citation needed ] the modulated signal is a digital signal. According to another definition, [ citation needed ] the modulation is a form of digital-to-analog conversion.

Most textbooks would consider digital modulation schemes as a form of digital transmissionsynonymous to data transmission ; very few would consider it as analog transmission. The most fundamental digital modulation techniques are based on keying :. In QAM, an in-phase signal or I, with one example being a cosine waveform and a quadrature phase signal or Q, with an example being a sine wave are amplitude modulated with a finite number of amplitudes and then summed.

It can be seen as a two-channel system, each channel using ASK. In all of the above methods, each of these phases, frequencies or amplitudes are assigned a unique pattern of binary bits. Usually, each phase, frequency or amplitude encodes an equal number of bits. This number of bits comprises the symbol that is represented by the particular phase, frequency or amplitude. For example, with an alphabet consisting of 16 alternative symbols, each symbol represents 4 bits. Thus, the data rate is four times the baud rate.

In the case of PSK, ASK or QAM, where the carrier frequency of the modulated signal is constant, the modulation alphabet is often conveniently represented on a constellation diagramshowing the amplitude of the I signal at the x-axis, and the amplitude of the Q signal at the y-axis, for each symbol.