steadymind
Full Member level 4
i am trying to design a decimator for sigma delta converter for audio. my decimation factor is 128. from material i found i decided on a CIC filter for first stage (decimation of 64) and a half band FIR as second.
so the CIC filter has 3 parameters - decimation factor , no of delay elements and the number of sections. i know the decimation factor but how do i determine number of differential delay elements and the number of stages.
sampling freq = 5.6448M , fin = 0-20khz, how do i design the filter to get me 80dB of stop band attenuation ?
so the CIC filter has 3 parameters - decimation factor , no of delay elements and the number of sections. i know the decimation factor but how do i determine number of differential delay elements and the number of stages.
sampling freq = 5.6448M , fin = 0-20khz, how do i design the filter to get me 80dB of stop band attenuation ?