I guess I got it! The default channel map is such that the first channel is the UN-fftshifted frequency location which is at 10 Hz (the 5th one on the list)! Whoo! It would be nice to tell a newcomer about this.
LD From: LD Zhang [mailto:ldz10...@gmail.com] Sent: Wednesday, May 15, 2013 4:16 PM To: discuss-gnuradio Discussion Group Subject: Troubled by the pfb channelizer center frequency location Dear Group, I am learning to do the pfb channelizer using the now famous example on the documentation page at: http://gnuradio.org/doc/doxygen/page_pfb.html The example is at the end of the page, where a 9-subchannels are pulled out of the original 9 kHz bandwidth signal. The original signals' tones are at [freqs = [-4070, -3050, -2030, -1010, 10, 1020, 2040, 3060, 4080] The original signal bandwidth should be from -4500 to 4500 Hz. According to my understanding the first channel signal should be centered at -70 Hz, since the 9 channels' centers should be at [-4000, -3000, ..., 3000, 4000]. But the output plot from the example shows that the first tone is at slightly greater than 0 Hz frequency. I don't know what is going on here? LD
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