The VCO is a special type of oscillator that has a frequency controlled by an applied voltage.The frequency of the VCO without any control signal applied is called the free running frequency.
Frequency Amplitude Phase from Anura Priyantha
The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.
to maintain the constant frequency and the phase parameters at the output
The wave has been offset from zero by 0.005 seconds
The zero phase frequency is the frequency at which the phase of the input signal and the output signal match.
The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.
Phase modulation and frequency modulation are related because changes in the phase of a signal result in corresponding changes in its frequency. When the phase of a signal is modulated, it causes variations in the frequency of the signal as well. Therefore, in practice, it is difficult to separate phase modulation from frequency modulation, especially in communication systems where both aspects are interconnected.
Amplitude Frequency
The VCO is a special type of oscillator that has a frequency controlled by an applied voltage.The frequency of the VCO without any control signal applied is called the free running frequency.
It gives frequency modulated signal
modulating signal is the low frequency signal .so we cant transmit for a long distance.so we go for modulating the signal either by modulating the amplitude or frequency or phase of the signal.
Following are the 3 parameter by which high Frequency carrier can be varied by low frequency intelligence signal 1) Amplitude 2) Phase 3) Frequency
Frequency drift of the local oscillator can cause distortion and loss of signal in the demodulated output, while phase drift can lead to phase error which affects the accuracy of demodulation in synchronous detection of DSB-SC modulation. Both drifts can introduce errors and reduce the quality of demodulated signal.
Different frequency components of a signal becoming out of phase
Frequency Amplitude Phase from Anura Priyantha
They are measuring two different things.