Re: [Discuss-gnuradio] Half-Band Filter Module Output Clipping?

2009-09-16 Thread Matt Ettus
Bruce McGuffin wrote: Based on the coefficients, we can guarantee that the final sum will have a magnitude which fits in 20 bits, including the sign bit. We can just drop those extra sign bits, since they'll all be the same. Matt So I'm curious. If the final sum fit into 20 bits, why wer

Re: [Discuss-gnuradio] Half-Band Filter Module Output Clipping?

2009-09-03 Thread Bruce McGuffin
Matt Ettus wrote: Bruce McGuffin wrote: Hi I've been looking at the USRP2 filter characteristics, to see if it will work for me. After going through the half-band filter code (hb_dec.v from gnu-radio 3.2) I understand what the filter coefficients are, but I have a question about the outpu

[Discuss-gnuradio] Half-Band Filter Module Output Clipping?

2009-09-02 Thread Bruce McGuffin
Hi I've been looking at the USRP2 filter characteristics, to see if it will work for me. After going through the half-band filter code (hb_dec.v from gnu-radio 3.2) I understand what the filter coefficients are, but I have a question about the output from this module. Near the end of the mod