On 01/20/2011 09:42 PM, James Jordan wrote: > Hi Tom, > This is very old topic. I have read a DSP book. But I find that I > still not very understand channelizer. > Why in channelizer use low pass filter, in my imagine channelizer will > use band pass filter to filter each > channel like that: 600Mhz baseband signal have 4 channel each channel > have 100Khz bandwidth. > so the channel freq is: 599.8Mhz 599.9Mhz 600Mhz 600.1Mhz. So I need 4 > bandpass filter to filter each > channel but actually the channelizer use lowpass filter, so why? > > I know you've asked Tom, but he's on the road. I haven't looked at the Gnu Radio channelizer, but one way to implement a channelizer is to convert all the signals to baseband, then low-pass filter.That way, all channels are at baseband when you're done.
Does that make sense? -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
