The Design and Implementation of a Real-Time Response System with Selective Filter Based in Frequency Domain

Abstract

With the rapid development and popularization of intelligent robots, the demand for human-computer interaction systems that respond in real time is also growing rapidly. The key to the realization of human-computer interaction is whether the robot system can convert electrical signals into other signals. For signal conversion systems in practical applications, the system will inevitably introduce noise and interference. How to filter out these interferences while still accurately reproducing the signal has become the focus of this article. By introducing a cross-over reproducer and a frequency selective notch filter, it is possible to achieve accurate response to high, middle and low frequencies covering the entire frequency domain. By adjusting the resonate frequency of the frequency-selective notch filter, it is possible to eliminate interference and fluctuation noise which is sometimes caused by the ripples caused by the AC power supplies when they are not perfectly converted into DC signals. The theoretical calculations and experimental bode diagrams show the efficacy of the proposed system design in reproducing the input electrical signals and eliminating the ripples.