DSB AM Modulator Passband
Modulate using double-sideband amplitude modulation
Library
Analog Passband Modulation, in Modulation
Description
The DSB AM Modulator Passband block modulates using double-sideband amplitude modulation. The output is a passband representation of the modulated signal. Both the input and output signals are real scalar signals.
If the input is u(t) as a function of time t, then the output is
where:
k is the Input signal offset parameter.
fc is the Carrier frequency parameter.
θ is the Initial phase parameter.
It is common to set the value of k to the maximum absolute value of the negative part of the input signal u(t).
Typically, an appropriate Carrier frequency value is much higher than the highest frequency of the input signal. By the Nyquist sampling theorem, the reciprocal of the model's sample time (defined by the model's signal source) must exceed twice the Carrier frequency parameter.
This block works only with real inputs of type double. This block does
not work inside a triggered subsystem.
Parameters
- Input signal offset
The offset factor k. This value should be greater than or equal to the absolute value of the minimum of the input signal.
- Carrier frequency (Hz)
The frequency of the carrier.
- Initial phase (rad)
The initial phase of the carrier.