Angle Modulation and Demodulation

These flashcards cover key terminology and concepts related to angle modulation and demodulation to assist with exam preparation.

Nonlinear Modulation

A modulation technique in which the relationship between the modulating signal and the output signal is not linear.

Bandwidth of Angle Modulated Waves

The range of frequencies the angle-modulated signals occupy in the frequency domain.

Instantaneous Frequency

The frequency of a signal at any given moment, defined as the derivative of the phase function.

Phase Modulation (PM)

A technique where the phase of the carrier signal is varied in accordance with the modulating signal.

Frequency Modulation (FM)

A method where the instantaneous frequency of the carrier is varied by the amplitude of the modulating signal.

Narrowband FM

A type of frequency modulation characterized by small frequency deviations and narrower bandwidth.

Wideband FM

A frequency modulation where the frequency deviations are significant, leading to a larger bandwidth.

Bessel Functions

Mathematical functions that describe the amplitudes of the frequency-modulated components.

Power of Angle Modulated Wave

The constant power output of an angle-modulated signal is given as A²/2.

Amplitude Distortion

Variations in amplitude in a modulated signal that can lead to inaccuracies in phase representation.

Frequency Shift Keying (FSK)

A frequency modulation technique where digital data is transmitted through discrete frequency changes.

Phase Shift Keying (PSK)

A method of modulating digital signals where the phase of the carrier wave is changed to represent data.

Pre-emphasis and De-emphasis

Techniques used in FM systems to strengthen high frequencies and suppress noise in transmission.

Super-Heterodyne Receiver

A type of radio receiver that uses frequency mixing to convert a received signal to a lower frequency.

Effects of Non-Linear Distortion

The changes to signal characteristics that occur due to non-linear devices in the transmission path.