issue when implementing IIR filter designed by scipy about cmsis-dsp HOT 4 CLOSED

Sorry that I just noticed that my biquad instance creation line is having incorrect order of data fields.
It is likely my usage bug. let me close this ticket first and reopen when necessary.

from cmsis-dsp.

I've confirmed my usage with CMSIS-DSP Python wrapper and the result is passed.

from cmsis-dsp.

@yf13 So you confirm there is no problems ?
I generally convert the filter into second order sections in scipy and then use those for the CMSIS-DSP biquad.

For instance : https://developer.arm.com/documentation/102463/0100/How-to-implement-biquads-to-filter-an-Electrocardiography-signal

Your IIR being already a second order section, what you do look right.

from cmsis-dsp.

@christophe0606 ,
Yes I confirmed that CMSIS-DSP library is in line with scipy.
I only need to use below definition to fix my above fragment:
arm_biquad_cascade_df2T_instance_f32 iir = {IIR_NUMSTAGES, __iir_states, _iir_coeffs}

Regards,
yf13

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