What is modulation and demodulation of a signal?
What is modulation and demodulation of a signal?
Modulation and demodulation Modulation is the process of encoding information in a transmitted signal, while demodulation is the process of extracting information from the transmitted signal. Many factors influence how faithfully the extracted information replicates the original input information.
What is the need for demodulation?
Need of demodulation The diaphragm of a telephone receiver or a loud speaker cannot vibrate with high frequency. Moreover, this frequency is beyond the audible range of human ear. So, it is necessary to separate the audio frequencies from radio- frequency carrier waves.
What circuit is used for FM demodulation?
The FM demodulator is done with the help of a circuit called Phase Locked Loop (PLL). A PLL should have basic functional blocks like Voltage Controlled Oscillator (VCO), Phase comparator, Low Pass Filter (LPF) and Source follower.
What does a demodulator do?
A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. There are many types of modulation so there are many types of demodulators.
Which device performs modulation and demodulation?
modem
A modem performs both modulation and demodulation.
How do you modulate frequency?
To generate a frequency modulated signal, the frequency of the radio carrier is changed in line with the amplitude of the incoming audio signal. When the audio signal is modulated onto the radio frequency carrier, the new radio frequency signal moves up and down in frequency.
What is FM demodulation and how does it work?
FM demodulation is a key process in the reception of a frequency modulated signal. Once the signal has been received, filtered and amplified, it is necessary to recover the original modulation from the carrier. It is this process that is called demodulation or detection.
What is a limiting amplifier stage in an FM demodulator?
If an FM demodulator is sensitive to amplitude variations as well as frequency variations, then the demodulator can be preceded a limiting amplifier stage. This stage runs into saturation when a signal of sufficient strength is present.
What is the frequency deviation of the demodulator?
Frequency deviation of the demodulator, in Hz, specified as a positive scalar. The system bandwidth is equal to twice the sum of the frequency deviation and the message bandwidth. Type of simulation to run, specified as Code generation or Interpreted execution. Code generation –– Simulate the model by using generated C code.
What is saturation in a demodulator / FM detector?
This stage runs into saturation when a signal of sufficient strength is present. By running in saturation, the amplitude variations are removed. The response that is normally seen for an FM demodulator / FM detector is known as an “S” curve for obvious reasons.
