Fill in the Blanks


1		Considered the greatest disadvantage of FM is its considerably signal bandwidth.


2		A sine wave carrier can be by varying its amplitude, frequency, or phase shift.


3		Impressing an information signal on a carrier by changing its frequency produces .


4		The amount of in carrier frequency produced by the modulating signal is known as the frequency deviation.


5		Frequency-shift keying is widely used in the of binary data in cell phones and in some types of low-speed computer modems.


6		When the amount of of a constant-frequency carrier is varied in accordance with a modulating signal, the resulting output is a phase modulation signal.


7		The maximum frequency produced by a phase modulator occurs during the time that the modulating signal is changing at its most rapid rate.


8		In FM, the frequency is directly proportional to the amplitude of the modulating signal.


9		To make PM compatible with FM, the intelligence signal is passed through a low-pass network.


10		The FM produced by a modulator is called indirect FM.


11		When a constant-frequency sine wave modulates a carrier, side frequencies are produced.


12		The of the frequency deviation to the modulating frequency is known as the modulation index.


13		The FM wave is expressed as a composite of sine waves of different frequencies and amplitudes that, when added, give an FM signal.


14		The symbol means factorial.


15		When an FM signal has a modulation index of 0.25 and occupies no more spectrum space than an AM signal, it is called FM.