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Frequency and Phase Modulation In frequency modulation (FM), the instantaneous amplitude of a signal remains constant, and the instantaneous frequency is varied instead A nonlinear PA such as a class C amplifier can be used in an FM transmitter without causing signal distortion, because the amplitude does not fluctuate

And finally, all that remains is to connect to the server with the XMLHttpRequest object s send method:

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function downloadText(url, callbackFunction) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", url); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { callbackFunction(XMLHttpRequestObjectresponseText); delete XMLHttpRequestObject; XMLHttpRequestObject = null; } } XMLHttpRequestObjectsend(null); } }

Let s test the downloadText function now by creating an Ajax-enabled page that uses it This page will have two buttons, one of which will download the contents of datatxt:

Frequency modulation can be obtained by applying the audio signal to a varactor in a tuned oscillator An example of this scheme, known as reactance modulation, is shown in Fig 25-7 The varying voltage across the varactor causes its capacitance to change in accordance with the audio waveform The changing capacitance results in variation of the resonant frequency of the inductance-capacitance (LC) tuned circuit, causing small fluctuations in the frequency generated by the oscillator Another way to get FM is to modulate the phase of the oscillator signal This causes small variations in the frequency, because any instantaneous phase change shows up as an instantaneous frequency change (and vice versa) When phase modulation is used, the audio signal must be processed, adjusting the frequency response of the audio amplifiers Otherwise the signal will sound unnatural when it is received Deviation is the maximum extent to which the instantaneous-carrier frequency differs from the unmodulated-carrier frequency For most FM voice communications transmitters, the deviation is standardized at 5 kHz This is known as narrowband FM (NBFM) The bandwidth of an NBFM signal is comparable to that of an AM signal containing the same modulating information In FM hi-fi music broadcasting, and in some other applications, the deviation is much greater than 5 kHz This is called wideband FM (WBFM) The deviation obtainable by means of direct FM is greater, for a given oscillator frequency, than the deviation that can be obtained by means of phase modulation The deviation of a signal can be increased by a frequency multiplier When an FM signal is passed through a frequency multiplier, the deviation is multiplied along with the carrier frequency The deviation in an FM signal should be equal to the highest modulating audio frequency if optimum fidelity is to be obtained Thus, 5 kHz is more than enough for voice For music, a deviation of 15 kHz or even 20 kHz is required for good reproduction when the signal is received.

And the other button will download the contents of data2txt:

In any FM signal, the ratio of the frequency deviation to the highest modulating audio frequency is called the modulation index Ideally, this figure is between 1:1 and 2:1 If it is less than 1:1, the signal sounds muffled or distorted, and efficiency is sacrificed Increasing it beyond 2:1 broadens the bandwidth without providing significant improvement in intelligibility or fidelity

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We ll name this page, which tests the downloadText function, downloadTexthtml We start by including ajaxframeworkjs, which makes the downloadText function accessible to our JavaScript:

Another method of modulation works by varying some aspect of a constant stream of signal pulses Several types of pulse modulation (PM) are briefly described in the following sections They are diagrammed in Fig 25-8 as amplitude-versus-time graphs The modulating waveform in each case is shown as a dashed curve, and the pulses are shown as vertical gray bars

<html> <head> <title>Downloading Text With the Ajax Framework Library Pack</title> <script type = "text/javascript" src = "ajaxframeworkjs"></script>

Now we can add the two buttons to the test web page:

amplitude modulation; at B, pulse width modulation; at C, pulse interval modulation; at D, pulse code modulation

<form> <input type onclick = <input type onclick = </form> = "button" value = "Get message 1" "downloadText('datatxt', callbackMessage1)"> = "button" value = "Get message 2" "downloadText('data2txt', callbackMessage2)">

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