Amplitude modulation (AM) is amodulation technique used in electronic communication, most commonly for transmitting messages with aradio wave. In amplitude modulation, theamplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as anaudio signal. This technique contrasts withangle modulation, in which either thefrequency of the carrier wave is varied, as infrequency modulation, or itsphase, as inphase modulation.
AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning withRoberto Landell de Moura andReginald Fessenden'sradiotelephone experiments in 1900.[1] This original form of AM is sometimes calleddouble-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency.Single-sideband modulation uses bandpass filters to eliminate one of the sidebands and possibly the carrier signal, which improves the ratio of message power to total transmissionpower, reduces power handling requirements of line repeaters, and permits better bandwidth utilization of the transmission medium.
Inelectronics,telecommunications andmechanics,modulation means varying some aspect of acontinuous wavecarrier signal with an information-bearing modulation waveform, such as anaudio signal which represents sound, or avideo signal which represents images. In this sense, the carrier wave, which has a much higher frequency than the message signal,carries the information. At the receiving station, the message signal is extracted from the modulated carrier bydemodulation.
In general form, a modulation process of asinusoidal carrier wave may be described by the following equation:[2]
.
A(t) represents the time-varying amplitude of the sinusoidal carrier wave and the cosine-term is the carrier at itsangular frequency, and the instantaneous phase deviation. This description directly provides the two major groups of modulation, amplitude modulation andangle modulation. In angle modulation, the termA(t) is constant and the second term of the equation has a functional relationship to the modulating message signal. Angle modulation provides two methods of modulation,frequency modulation andphase modulation.
In amplitude modulation, the angle term is held constant and the first term,A(t), of the equation has a functional relationship to the modulating message signal.
The modulating message signal may be analog in nature, or it may be a digital signal, in which case the technique is generally calledamplitude-shift keying.
For example, in AM radio communication, a continuous wave radio-frequency signal has its amplitude modulated by an audio waveform before transmission. The message signal determines theenvelope of the transmitted waveform. In thefrequency domain, amplitude modulation produces a signal with power concentrated at thecarrier frequency and two adjacentsidebands. Each sideband is equal inbandwidth to that of the modulating signal, and is a mirror image of the other. Standard AM is thus sometimes called "double-sideband amplitude modulation" (DSBAM).
A disadvantage of all amplitude modulation techniques, not only standard AM, is that the receiver amplifies and detectsnoise andelectromagnetic interference in equal proportion to the signal. Increasing the receivedsignal-to-noise ratio, say, by a factor of 10 (a 10decibel improvement), thus would require increasing the transmitter power by a factor of 10. This is in contrast tofrequency modulation (FM) anddigital radio where the effect of such noise following demodulation is strongly reduced so long as the received signal is well above the threshold for reception. For this reason AM broadcast is not favored for music andhigh fidelity broadcasting, but rather for voice communications and broadcasts (sports, news,talk radio etc.).
AM is also inefficient in power usage; at least two-thirds of the power is concentrated in the carrier signal. The carrier signal contains none of the original information being transmitted (voice, video, data, etc.). However its presence provides a simple means of demodulation usingenvelope detection, providing a frequency and phase reference to extract the modulation from the sidebands. In some modulation systems based on AM, a lower transmitter power is required through partial or total elimination of the carrier component, however receivers for these signals are more complex because they must provide a precise carrier frequency reference signal (usually as shifted to theintermediate frequency) from a greatly reduced "pilot" carrier (inreduced-carrier transmission or DSB-RC) to use in the demodulation process. Even with the carrier eliminated indouble-sideband suppressed-carrier transmission, carrier regeneration is possible using aCostas phase-locked loop. This does not work forsingle-sideband suppressed-carrier transmission (SSB-SC), leading to the characteristic "Donald Duck" sound from such receivers when slightly detuned. Single-sideband AM is nevertheless used widely inamateur radio and other voice communications because it has power and bandwidth efficiency (cutting the RF bandwidth in half compared to standard AM). On the other hand, inmedium wave andshort wave broadcasting, standard AM with the full carrier allows for reception using inexpensive receivers. The broadcaster absorbs the extra power cost to greatly increase potential audience.
A simple form of digital amplitude modulation which can be used for transmittingbinary data ison–off keying, the simplest form of amplitude-shift keying, in whichones and zeros are represented by the presence or absence of a carrier. On–off keying is likewise used by radio amateurs to transmitMorse code where it is known as continuous wave (CW) operation, even though the transmission is not strictly "continuous". A more complex form of AM,quadrature amplitude modulation is now more commonly used with digital data, while making more efficient use of the available bandwidth.
A simple form of amplitude modulation is the transmission of speech signals from a traditional analog telephone set using a common battery local loop.[3] The direct current provided by the central office battery is a carrier with a frequency of 0 Hz. It is modulated by a microphone (transmitter) in the telephone set according to the acoustic signal from the speaker. The result is a varying amplitude direct current, whose AC-component is the speech signal extracted at the central office for transmission to another subscriber.
An additional function provided by the carrier in standard AM, but which is lost in either single or double-sideband suppressed-carrier transmission, is that it provides an amplitude reference. In the receiver, theautomatic gain control (AGC) responds to the carrier so that the reproduced audio level stays in a fixed proportion to the original modulation. On the other hand, with suppressed-carrier transmissions there isno transmitted power during pauses in the modulation, so the AGC must respond to peaks of the transmitted power during peaks in the modulation. This typically involves a so-calledfast attack, slow decay circuit which holds the AGC level for a second or more following such peaks, in between syllables or short pauses in the program. This is very acceptable for communications radios, wherecompression of the audio aids intelligibility. However, it is absolutely undesired for music or normal broadcast programming, where a faithful reproduction of the original program, including its varying modulation levels, is expected.
One of the crude pre-vacuum tube AM transmitters, a Telefunkenarc transmitter from 1906. The carrier wave is generated by 6 electric arcs in the vertical tubes, connected to atuned circuit. Modulation is done by the large carbon microphone(cone shape) in the antenna lead.One of the firstvacuum tube AM radio transmitters, built by Meissner in 1913 with an early triode tube by Robert von Lieben. He used it in a historic 36 km (22 mi) voice transmission from Berlin to Nauen, Germany. Compare its small size with the arc transmitter above.
Amplitude modulation was used in experiments of multiplex telegraph and telephone transmission in the late 1800s.[4] However, the practical development of this technology is identified with the period between 1900 and 1920 ofradiotelephone transmission, that is, the effort to send audio signals by radio waves. The first radio transmitters, calledspark gap transmitters, transmitted information bywireless telegraphy, using pulses of the carrier wave to spell out text messages inMorse code. They could not transmit audio because the carrier consisted of strings ofdamped waves, pulses of radio waves that declined to zero, and sounded like a buzz in receivers. In effect they were already amplitude modulated.
The first AM transmission was made by Canadian-born American researcherReginald Fessenden[5] on December 23, 1900[6] using a spark gap transmitter with a specially designed high frequency 10 kHzinterrupter,[7] over a distance of one mile (1.6 km) at Cobb Island, Maryland, US. His first transmitted words were, "Hello. One, two, three, four. Is it snowing where you are, Mr. Thiessen?".[6] Though his words were "perfectly intelligible", the spark created a loud and unpleasant noise.[7]
Fessenden was a significant figure in the development of AM radio. He was one of the first researchers to realize, from experiments like the above, that the existing technology for producing radio waves, the spark transmitter, was not usable for amplitude modulation, and that a new kind of transmitter, one that producedsinusoidalcontinuous waves, was needed. This was a radical idea at the time, because experts believed the impulsive spark was necessary to produce radio frequency waves, and Fessenden was ridiculed. He invented and helped develop one of the first continuous wave transmitters – theAlexanderson alternator, with which he made what is considered the first AM public entertainment broadcast on Christmas Eve, 1906. He also discovered the principle on which AM is based,heterodyning, and invented one of the firstdetectors able torectify and receive AM, theelectrolytic detector or "liquid baretter", in 1902. Other radio detectors invented for wireless telegraphy, such as theFleming valve (1904) and thecrystal detector (1906) also proved able to rectify AM signals, so the technological hurdle was generating AM waves; receiving them was not a problem.
Early experiments in AM radio transmission, conducted by Fessenden,Valdemar Poulsen,Ernst Ruhmer,Quirino Majorana,Charles Herrold, andLee de Forest, were hampered by the lack of a technology foramplification. The first practical continuous wave AMtransmitters were based on either the huge, expensiveAlexanderson alternator, developed 1906–1910, or versions of thePoulsen arc transmitter (arc converter), invented in 1903. The modifications necessary to transmit AM were clumsy and resulted in very low quality audio. Modulation was usually accomplished by acarbon microphone inserted directly in the antenna or ground wire; its varying resistance varied the current to the antenna. The limited power handling ability of the microphone severely limited the power of the first radiotelephones; many of the microphones were water-cooled.
The 1912 discovery of the amplifying ability of theAudion tube, invented in 1906 byLee de Forest, solved these problems. The vacuum tubefeedback oscillator, invented in 1912 byEdwin Armstrong andAlexander Meissner, was a cheap source ofcontinuous waves and could be easilymodulated to make an AM transmitter. Modulation did not have to be done at the output but could be applied to the signal before the final amplifier tube, so the microphone or other audio source didn't have to modulate a high-power radio signal. Wartime research greatly advanced the art of AM modulation, and after the war the availability of cheap tubes sparked a great increase in the number of radio stations experimenting with AM transmission of news or music. The vacuum tube was responsible for the rise ofAM broadcasting around 1920, the first electronicmass communication medium. Amplitude modulation was virtually the only type used forradio broadcasting untilFM broadcasting began after World War II.
At the same time as AM radio began,telephone companies such asAT&T were developing the other large application for AM: sending multiple telephone calls through a single wire by modulating them on separatecarrier frequencies, calledfrequency division multiplexing.[4]
In 1915,John Renshaw Carson formulated the first mathematical description of amplitude modulation, showing that a signal and carrier frequency combined in a nonlinear device creates a sideband on both sides of the carrier frequency. Passing the modulated signal through another nonlinear device can extract the original baseband signal.[4] His analysis also showed that only one sideband was necessary to transmit the audio signal, and Carson patentedsingle-sideband modulation (SSB) on 1 December 1915.[4] This advanced variant of amplitude modulation was adopted by AT&T forlongwave transatlantic telephone service beginning 7 January 1927. After WW-II, it was developed for military aircraft communication.
The carrier wave (sine wave) of frequencyfc and amplitudeA is expressed by
.
The message signal, such as an audio signal that is used for modulating the carrier, ism(t), and has a frequencyfm, much lower thanfc:
,
wherem is the amplitude sensitivity,M is the amplitude of modulation. Ifm < 1,(1 + m(t)/A) is always positive for undermodulation. Ifm > 1 then overmodulation occurs and reconstruction of message signal from the transmitted signal would lead in loss of original signal. Amplitude modulation results when the carrierc(t) is multiplied by the positive quantity(1 + m(t)/A):
In this simple casem is identical to themodulation index, discussed below. Withm = 0.5 the amplitude modulated signaly(t) thus corresponds to the top graph (labelled "50% Modulation") in figure 4.
Therefore, the modulated signal has three components: the carrier wavec(t) which is unchanged in frequency, and twosidebands with frequencies slightly above and below the carrier frequencyfc.
Figure 2: Double-sided spectra of baseband and AM signals.
A useful modulation signalm(t) is usually more complex than a single sine wave, as treated above. However, by the principle ofFourier decomposition,m(t) can be expressed as the sum of a set of sine waves of various frequencies, amplitudes, and phases. Carrying out the multiplication of1 + m(t) withc(t) as above, the result consists of a sum of sine waves. Again, the carrierc(t) is present unchanged, but each frequency component ofm atfi has two sidebands at frequenciesfc + fi andfc – fi. The collection of the former frequencies above the carrier frequency is known as the upper sideband, and those below constitute the lower sideband. The modulationm(t) may be considered to consist of an equal mix of positive and negative frequency components, as shown in the top of figure 2. One can view the sidebands as that modulationm(t) having simply been shifted in frequency byfc as depicted at the bottom right of figure 2.
Figure 3: Thespectrogram of an AM voice broadcast shows the two sidebands (green) on either side of the carrier (red) with time proceeding in the vertical direction.
The short-term spectrum of modulation, changing as it would for a human voice for instance, the frequency content (horizontal axis) may be plotted as a function of time (vertical axis), as in figure 3. It can again be seen that as the modulation frequency content varies, an upper sideband is generated according to those frequencies shiftedabove the carrier frequency, and the same content mirror-imaged in the lower sideband below the carrier frequency. At all times, the carrier itself remains constant, and of greater power than the total sideband power.
The RF bandwidth of an AM transmission (refer to figure 2, but only considering positive frequencies) is twice the bandwidth of the modulating (or "baseband") signal, since the upper and lower sidebands around the carrier frequency each have a bandwidth as wide as the highest modulating frequency. Although the bandwidth of an AM signal is narrower than one usingfrequency modulation (FM), it is twice as wide assingle-sideband techniques; it thus may be viewed as spectrally inefficient. Within a frequency band, only half as many transmissions (or "channels") can thus be accommodated. For this reason analog television employs a variant of single-sideband (known asvestigial sideband, somewhat of a compromise in terms of bandwidth) in order to reduce the required channel spacing.
Another improvement over standard AM is obtained through reduction or suppression of the carrier component of the modulated spectrum. In figure 2 this is the spike in between the sidebands; even with full (100%) sine wave modulation, the power in the carrier component is twice that in the sidebands, yet it carries no unique information. Thus there is a great advantage in efficiency in reducing or totally suppressing the carrier, either in conjunction with elimination of one sideband (single-sideband suppressed-carrier transmission) or with both sidebands remaining (double sideband suppressed carrier). While these suppressed carrier transmissions are efficient in terms of transmitter power, they require more sophisticated receivers employingsynchronous detection and regeneration of the carrier frequency. For that reason, standard AM continues to be widely used, especially in broadcast transmission, to allow for the use of inexpensive receivers usingenvelope detection. Even (analog) television, with a (largely) suppressed lower sideband, includes sufficient carrier power for use of envelope detection. But for communications systems where both transmitters and receivers can be optimized, suppression of both one sideband and the carrier represent a net advantage and are frequently employed.
A technique used widely in broadcast AM transmitters is an application of the Hapburg carrier, first proposed in the 1930s but impractical with the technology then available. During periods of low modulation the carrier power would bereduced and would return to full power during periods of high modulation levels. This has the effect of reducing the overall power demand of the transmitter and is most effective on speech type programmes. Various trade names are used for its implementation by the transmitter manufacturers from the late 80's onwards.
The AM modulation index is a measure based on the ratio of the modulation excursions of the RF signal to the level of the unmodulated carrier. It is thus defined as:
where and are the modulation amplitude and carrier amplitude, respectively; the modulation amplitude is the peak (positive or negative) change in the RF amplitude from its unmodulated value. Modulation index is normally expressed as a percentage, and may be displayed on a meter connected to an AM transmitter.
So if, carrier amplitude varies by 50% above (and below) its unmodulated level, as is shown in the first waveform, below. For, it varies by 100% as shown in the illustration below it. With 100% modulation the wave amplitude sometimes reaches zero, and this represents full modulation using standard AM and is often a target (in order to obtain the highest possiblesignal-to-noise ratio) but mustn't be exceeded. Increasing the modulating signal beyond that point, known asovermodulation, causes a standard AM modulator (see below) to fail, as the negative excursions of the wave envelope cannot become less than zero, resulting indistortion ("clipping") of the received modulation. Transmitters typically incorporate alimiter circuit to avoid overmodulation, and/or acompressor circuit (especially for voice communications) in order to still approach 100% modulation for maximum intelligibility above the noise. Such circuits are sometimes referred to as avogad.
However it is possible to talk about a modulation index exceeding 100%, without introducing distortion, in the case ofdouble-sideband reduced-carrier transmission. In that case, negative excursions beyond zero entail a reversal of the carrier phase, as shown in the third waveform below. This cannot be produced using the efficient high-level (output stage) modulation techniques (see below) which are widely used especially in high powerbroadcast transmitters. Rather, a special modulator produces such a waveform at a low level followed by alinear amplifier. What's more, a standard AM receiver using anenvelope detector is incapable of properly demodulating such a signal. Rather, synchronous detection is required. Thus double-sideband transmission is generallynot referred to as "AM" even though it generates an identical RF waveform as standard AM as long as the modulation index is below 100%. Such systems more often attempt a radical reduction of the carrier level compared to the sidebands (where the useful information is present) to the point ofdouble-sideband suppressed-carrier transmission where the carrier is (ideally) reduced to zero. In all such cases the term "modulation index" loses its value as it refers to the ratio of the modulation amplitude to a rather small (or zero) remaining carrier amplitude.
Figure 4: Modulation depth. In the diagram, the unmodulated carrier has an amplitude of 1.
Anode (plate) modulation. A tetrode's plate and screen grid voltage is modulated via an audio transformer. The resistor R1 sets the grid bias; both the input and output are tuned circuits with inductive coupling.
Modulation circuit designs may be classified as low- or high-level (depending on whether they modulate in a low-power domain—followed by amplification for transmission—or in the high-power domain of the transmitted signal).[8]
In modern radio systems, modulated signals are generated viadigital signal processing (DSP). With DSP many types of AM are possible with software control (including DSB with carrier, SSB suppressed-carrier and independent sideband, or ISB). Calculated digital samples are converted to voltages with adigital-to-analog converter, typically at a frequency less than the desired RF-output frequency. The analog signal must then be shifted in frequency andlinearly amplified to the desired frequency and power level (linear amplification must be used to prevent modulation distortion).[9]This low-level method for AM is used in many Amateur Radio transceivers.[10]
AM may also be generated at a low level, using analog methods described in the next section.
Older designs (for broadcast and amateur radio) also generate AM by controlling the gain of the transmitter's final amplifier (generally class-C, for efficiency). The following types are for vacuum tube transmitters (but similar options are available with transistors):[12][13]
Plate modulation
In plate modulation, the plate voltage of the RF amplifier is modulated with the audio signal. The audio power requirement is 50 percent of the RF-carrier power.
Heising (constant-current) modulation
RF amplifier plate voltage is fed through achoke (high-value inductor). The AM modulation tube plate is fed through the same inductor, so the modulator tube diverts current from the RF amplifier. The choke acts as a constant current source in the audio range. This system has a low power efficiency.
Control grid modulation
The operating bias and gain of the final RF amplifier can be controlled by varying the voltage of the control grid. This method requires little audio power, but care must be taken to reduce distortion.
Clamp tube (screen grid) modulation
The screen-grid bias may be controlled through aclamp tube, which reduces voltage according to the modulation signal. It is difficult to approach 100-percent modulation while maintaining low distortion with this system.
One tube provides the power under carrier conditions and another operates only for positive modulation peaks. Overall efficiency is good, and distortion is low.
Two tubes are operated in parallel, but partially out of phase with each other. As they are differentially phase modulated their combined amplitude is greater or smaller. Efficiency is good and distortion low when properly adjusted.
A highly efficient high voltage power supply is applied to the tube plate. The output voltage of this supply is varied at an audio rate to follow the program. This system was pioneered byHilmer Swanson and has a number of variations, all of which achieve high efficiency and sound quality.
Digital methods
TheHarris Corporation obtained a patent for synthesizing a modulated high-power carrier wave from a set of digitally selected low-power amplifiers, running in phase at the same carrier frequency.[14][citation needed] The input signal is sampled by a conventional audio analog-to-digital converter (ADC), and fed to a digital exciter, which modulates overall transmitter output power by switching a series of low-power solid-state RF amplifiers on and off. The combined output drives the antenna system.
The simplest form of AM demodulator consists of adiode which is configured to act asenvelope detector. Another type of demodulator, theproduct detector, can provide better-quality demodulation with additional circuit complexity.
^abAdvisory Group for Research and Development (AGARD) (2 October 1992).ELF/VLF/LF Radio Propagation and Systems Aspects(PDF) (Report). North Atlantic Treaty Organization (NATO). Retrieved16 December 2024.
^Silver, Ward, ed. (2011). "Ch. 15 DSP and Software Radio Design".The ARRL Handbook for Radio Communications (Eighty-eighth ed.). American Radio Relay League.ISBN978-0-87259-096-0.
^Silver, Ward, ed. (2011). "Ch. 14 Transceivers".The ARRL Handbook for Radio Communications (Eighty-eighth ed.). American Radio Relay League.ISBN978-0-87259-096-0.
Newkirk, David and Karlquist, Rick (2004). Mixers, modulators and demodulators. In D. G. Reed (ed.),The ARRL Handbook for Radio Communications (81st ed.), pp. 15.1–15.36. Newington: ARRL.ISBN0-87259-196-4.
