- #1
Riscilla
- 17
- 1
Hi friends,
I have a question regarding the use of filters in closed-loop control systems. Very often in a system like that there is noise from the sensor, and we have to put a filter after the sensor to eliminate the noise. However, all filters produce a phase shift as well as an amplitude attenuation into the measured signal, therefore the signal we get is already distorted. My question is that how could we control the system in these circumstances?
To make things clearer, I will give an example: Suppose I intend to setup a digital control system with a update frequency (sample rate) of 1 (kHz). But the measured signal is very noisy, so I have to use a filter to reduce the noise. After several tries, I come up with a filter which has a -3db of 200 (Hz). With this sensor, all noises are removed, however, there are also a lot of phase shift and amplitude attenuation. Can we still control the system with that filter?
Thank you for reading my question. Any answer would be very appreciated.
Regards,
Riscilla
I have a question regarding the use of filters in closed-loop control systems. Very often in a system like that there is noise from the sensor, and we have to put a filter after the sensor to eliminate the noise. However, all filters produce a phase shift as well as an amplitude attenuation into the measured signal, therefore the signal we get is already distorted. My question is that how could we control the system in these circumstances?
To make things clearer, I will give an example: Suppose I intend to setup a digital control system with a update frequency (sample rate) of 1 (kHz). But the measured signal is very noisy, so I have to use a filter to reduce the noise. After several tries, I come up with a filter which has a -3db of 200 (Hz). With this sensor, all noises are removed, however, there are also a lot of phase shift and amplitude attenuation. Can we still control the system with that filter?
Thank you for reading my question. Any answer would be very appreciated.
Regards,
Riscilla