How Do We ‘Measure’ Waves?
Amplitude: Measures the height of the wave.
Higher amplitude means louder sound or brighter light.
Frequency: The number of wave crests passing a point per second, measured in hertz (Hz).
Higher frequency means more waves per second
Wavelength: The distance between successive crests or troughs of a wave, measured in meters
What Are FM and AM?
FM (Frequency Modulation):
Definition: Adjusts the frequency of the carrier wave to encode information.
FM: Higher frequency range, better quality, but limited to line-of-sight transmission.
Example: Radio stations like 100.1 FM.
AM (Amplitude Modulation):
Definition: Adjusts the amplitude (height) of the carrier wave to encode information.
AM: Lower frequency range, more coverage but more susceptible to static.
Example: Radio stations like 783 AM.
What Is Phase Modulation?
Definition: Changes the phase (position) of the wave to encode information, while keeping the frequency and amplitude constant.
Advantage: Less affected by amplitude variations and noise, making it ideal for digital transmissions like Wi-Fi.
What Are Digital and Analog?
Digital: Information is represented as discrete values (0s and 1s).
Examples include digital radio and Wi-Fi.
Analog: Information is represented as continuous waves. Examples include AM and FM radio.
How Is Signal Modulation Used?
Modulation allows different signals to travel simultaneously on the same channel without interference.
Modulation helps minimize interference and static, improving signal quality.
Analog modulation (AM/FM) is used for traditional radio and TV.
Digital modulation is used for modern technologies like the internet.
COMMENTS