Howtosignalprocessing
Let us use mathematical terms to relate our signals. For the message signal in the above example, the following mathematical expression represents it. Equation 1. m(t) = Am cos (2*pi*fm*t), Am=3, fm=5 Hz, t=time.
- What is a message signal?
- What is the formula for FM?
- What is message signal frequency?
- How do you calculate AM frequency?
What is a message signal?
The message signal, or information signal, contains the data for transmission. The message signal modulates the carrier wave to create the modulated wave for transmission. The process of demodulation recovers the message signal data from the modulated wave. The message signal is often called the baseband signal.
What is the formula for FM?
If Δf = 75 KHz, FM = 500 Hz then the bandwidth of frequency modulation will be = 2 [75 + (500/1000)] KHz = 151.0 KHz. If Δf = 75 KHz FM = 5000 Hz then the bandwidth of FM will be = 2 [75 + (5000/1000)] KHz = 160.0 KHz.
What is message signal frequency?
1. Frequency-division multiplexing (FDM), in which CW modulation (e.g., frequency modulation) is used to translate each message signal to reside inside a specific frequency slot inside the passband of the channel by assigning it a distinct carrier frequency.
How do you calculate AM frequency?
Since we know the period of the wave, we can easily determine the frequency: f = 1/T = 100 Hz. The information signal is represented mathematically below. where Am=amplitude, fm=message's frequency, t is time, φ is phase which equals 0 in our example.
