Analog modulation techniques are the modulation technique which are performed by the analog signals only, that means there is no changing into digital data.
in this both base band or message signal and carrier signal are in analog in nature
these analog modulation techniques are
- amplitude modulation
- phase modulation
- frequency modulation
amplitude modulation
amplitude modulation is defined as amplitude of the carrier signal changes with respect to message signal. that means here carrier signal characteristic of amplitude changes according to message signal.
phase modulation
phase modulation is defined as phase of the carrier signal changes with respect to message signal or base band signal. that means carrier signal characteristic of phase changes according to message signal.
frequency modulation
frequency modulation is defined as frequency of the carrier signal changes with respect to message signal. that means the frequency characteristic of carrier signal changes according to message signal.
frequency = 1/time period
band width is defined as the difference of the upper frequency and lower frequency in a spectrum.
Band Width = fup - flow
note: please comment that you need any topic of analog communication
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