I'm trying to design a half band filter for interpolation used in Sigma delta modulator. Current using Matlab delsig toolbox by Richard Schreier..
There is a function designHBF. I try the example given and got the result as stated in the pdf which is the snap shot below. I cant understand how to connect the value obtain with the diagram given. What is the switch at the end of the filter in interpolation structure (out@fs) mean? Anyone can help? thanks
they are just switching with the double fs rate.
Look, the bottom of the interpolation structure picture is just a delay line that outputs direct input samples. The top branch of processing represents the interpolation, which inserts samples between input so as to get double output rate.
Top branch is just a shift register. It works at input rate.
And what rate are you waiting at the output?
And what the interpolated samples should be placed between?
my input sampling frequency is 41khz and would like to upsampling it to 82khz....so at the output (out@fs), should i implement a switch that switching at the frequency of 82khz for the upsampling purpose?
What do you mean by " what the interpolated samples should be placed between?
my input sampling frequency is 41khz and would like to upsampling it to 82khz....so at the output (out@fs), should i implement a switch that switching at the frequency of 82khz for the upsampling purpose?
What do you mean by " what the interpolated samples should be placed between?