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When i obtain high pass filter using arm_conv_partial_f32 function instead of arm_fir_f32 function; i get same output array with opposite signs. This situation is not seen when i use low pass or mid pass filter. Anyone help?
I have a hunch what is happening. The FIR filter function arm_fir_f32() requires that the filter coefficients be in time reversed order. The arm_conv_partial_f32() has the coefficients in normal order. In a high pass filter, the coefficients typically alternate in sign. If the length of the filter is even then time flipping the filter is equivalent to scaling by -1.