Communications

A sine wave which is coherent with carrier has identical

In FM the change in carrier frequency is proportional to what attribute of the modulating signal?

A louder sound, when generating the modulating waveform for FM, will cause a greater

A reactance modulator is one method of obtaining

A device, now available in IC form, is useful for direct FM and as one element in the phase-locked loop.

________ is a frequency change process, whereby the phase deviation and frequency deviation are multiplied by some fixed constant.

The ratio detector is superior to the slope detector because

One implementation of a pulse-averaging discriminator is

A 10% increase in the frequency of a constant-width pulse train should cause what change in its average value?

Two different signals can be coherent if they

A quadrature detector requires that

Identify an advantage , or advantages, of a properly designed FM system.

If the unmodulated level peak carrier amplitude is doubled in an AM signal, the percent modulation is ___________.

A single-tone amplitude modulated wave has _________.

It is the width of frequencies within the spectrum occupied by a signal and used by the signal for conveying information.

__________ is a kind of modulation in which the modulated wave is always present.

A type of modulation in which no signal is present between pulses.

What describes the amount of amplitude change present in an AM waveform?

__________ is a form of amplitude distortion introduced when the positive and negative alternations in the AM modulated signals are not equal.

What is the advantage of phase modulation over direct FM frequency modulation?