DSB AM Modulator Passband
Modulation using dual-band amplitude modulation.
Description
The DSB AM Modulator Passband unit performs modulation using dual band amplitude modulation (DSB AM). The output is a passband representation of the modulated signal. The input and output signals are real scalar signals.
If the input is a signal as a function as a function of time, the output is:
,
where
-
- input signal offset, the value of the Input signal offset parameter;
-
- carrier frequency, value of Carrier frequency (Hz);
-
- initial phase, value of parameter Initial phase (rad).
Usually the value is set equal to the maximum absolute value of the negative part of the input signal .
Typically, a suitable value of Carrier frequency (Hz) is well above the highest frequency of the input signal. By Kotelnikov’s theorem, the inverse of the model sampling period (determined by the source of the model signal) should be greater than twice the value of Carrier frequency (Hz).
This block works only with real inputs of Float64 type. This block does not work inside the trigger subsystem.
Parameters
Parameters
# Input signal offset — input offset
Details
Offset coefficient . The value of this parameter must be greater than or equal to the absolute value of the input signal minimum.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Carrier frequency (Hz) — carrier frequency
Details
Carrier frequency in Hz.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Initial phase (rad) — initial phase
Details
Initial phase in rad.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |