DSB AM Demodulator Passband
Demodulation of a signal modulated using two-band amplitude modulation.
Description
The DSB AM Demodulator Passband unit demodulates a signal modulated using dual band amplitude modulation (DSB AM). The block uses the envelope detection method. The passband of the modulated signal is input. The input and output signals are real scalar signals.
In the demodulation process, this block uses a filter whose parameters (order, coefficients, cutoff frequency) are described by the corresponding parameters of the low-pass filter.
As a rule, a suitable value of Carrier frequency (Hz) is much higher than the highest frequency of the input signal. According to Kotelnikov’s theorem, the value inverse to the sampling period of the model (determined by the source of the model signal) should exceed twice the value of the Carrier frequency (Hz) parameter.
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
Input signal offset. This parameter must match the same parameter in the DSB AM Modulator Passband block.
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
# Carrier frequency (Hz) — carrier frequency
Details
Carrier frequency in Hz. This parameter must correspond to the same parameter in block DSB AM Modulator Passband.
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
# Initial phase (rad) — initial phase
Details
Initial phase in rad.
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
#
Lowpass filter design method —
Low pass filter design method
Butterworth
Details
A method used to design a low pass filter.
| Values |
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| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
# Filter order — filter order
Details
The order of the digital low-pass filter.
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
# Cutoff frequency (Hz) — filter cut-off frequency
Details
The cut-off frequency of the digital low-pass filter in Hz.
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |