Hi,
I have questions about the parameters in the DBPSK and Low Pass Filter blocks in GRC.
Low Pass Filter block:
1) If I set the lowpass filter block to interpolate by a factor of 10 should the sampling rate parameter by set to the input sampling rate or the output sampling rate since they will obviously differ by a factor of 10?
2) If I set the lowpass filter block to interpolate by a factor of 10 is the filtering operation performed before interpolation or after interpolation? (Can the filter get rid of the spectral copies centered at multiples of the input sample rate that are created during interpolation or do I need another lowpass filter afterwards to remove these spectral copies?)
DBPSK block:
1) What exactly is the Samples / Symbol parameter mean? I am trying to figure out what the relationship is between the input sample rate (bytes per second) to the output sample rate in (complex samples per second).
2) Since the input is bytes is each bit of the byte converted to a separate symbol meaning get 8 symbols for each imput sample(each byte)?
Thanks,
Dave