Linear Time-Varying Multi-Notch FIR Filter for Fast EMG Measurements

This paper presents a concept of implementing time-varying FIR narrow multi-band-stop filter for fast EMG measurements. The proposed system consists of a notch type filter with predefined time-varying coefficients and an IMU-based trigger to start the measurement of the muscle movement. The coefficients of the proposed filter are calculated according to the defined function in the selected time span. The use of an external trigger, which signals the moment of the muscle movement, allows to use the time-varying filter not only in the beginning of the measurement but also further during the test. The paper is an extension of the previous research in the field of time-varying filtering structures.