electrodarkness
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Hi everyone!
I wanted to design some digital filters for an ECG device based on Zynq SoC. Since The device works with 24bits of data, I can't use the FIR block present in System generator. So I designed a low-pass 65th order FIR filter with 250Hz cutoff frequency, and a 2nd order band-stop IIR filter with 50Hz center frequency, and created them in HLS. The problem arises when I try to simulate the blocks in System generator, The FIR filter has a periodical overshoot with a chirp signal as input. I'm still struggling to find the cause.
The second problem is: The final filter would be one generated by the convolution of the FIR and IIR filter coefficients, to simplify the use (although, if I can't manage to do this, the separate filtering will be used). I used convolution and tested the complex filter in Matlab, it works, while in system generator it gives some noise.
I've attached my HLS filter files, the simulation setup, and a picture of the raw/filtered data plot.
Any help would be appreciated!
Feher Aron.
I wanted to design some digital filters for an ECG device based on Zynq SoC. Since The device works with 24bits of data, I can't use the FIR block present in System generator. So I designed a low-pass 65th order FIR filter with 250Hz cutoff frequency, and a 2nd order band-stop IIR filter with 50Hz center frequency, and created them in HLS. The problem arises when I try to simulate the blocks in System generator, The FIR filter has a periodical overshoot with a chirp signal as input. I'm still struggling to find the cause.
The second problem is: The final filter would be one generated by the convolution of the FIR and IIR filter coefficients, to simplify the use (although, if I can't manage to do this, the separate filtering will be used). I used convolution and tested the complex filter in Matlab, it works, while in system generator it gives some noise.
I've attached my HLS filter files, the simulation setup, and a picture of the raw/filtered data plot.
Any help would be appreciated!
Feher Aron.
