Digital first-order low pass filter Simulink Simulation
Digital first-order low pass filter Simulink Simulation
principle
Procedure formula
y(n) = q*x(n) + (1-q)*y(n-1)
Where Y (n) represents the current output, X (n) represents the current input, Y (n-1) means the last output, Q is the filter coefficient.
Link: SeeDetailed analysis of digital first-order low pass filter.
Filter coefficient calculation method
q < F2π*t
Where Q is the filter coefficient (usually less than 1), f is the cutoff frequency, and T is the calculation frequency.
Link: SeeSoftware implementation and related parameters of RC first-order low pass filter.
But when the actual application finds that the method calculated by the method is smaller.
simulation
Construction according to formula
The main part is as follows, the cutoff frequency is calculated according to the RC circuit:
The ideal signal is a sine wave, the magnitude 10, and the frequency is 1 Hz. The noise is a sine wave, the magnitude 1, 10 kHz. as the picture shows:
The delay module sampling frequency is 10 kHz, which is set to 1e-4 (corresponding to a PWM triggering ADC sample of 10 kHz).
The model emulation is set to a fixed step 1e-6, and the simulation time is 2s.
The output is as follows:
Use Simulink self-contained model
The main parts are as follows:
The low-pass filter cutoff frequency is 1540 Hz, and the specific setting is as follows:
Other settings are the same.
The output is as follows:
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