Re: [casper] 1 M Channel turorial

2014-12-09 Thread Edgardo Huaracán Durán
Hi Again!, I've been trying to setup the technique you use. I programmed what you said in matlab, generated a corner turn after the first PFB+FFT writing the spectra row wise, and then feed the second FFT with the data of the Corner Turner column wise. But what i see in the final spectra is not li

Re: [casper] 1 M Channel turorial

2014-10-10 Thread Danny Price
Hi Edguardo If I recall right, the tutorial is a 2048 point real PFB + FFT (1024 channels), a 1024x1024 corner turn, and then a 1024 point complex FFT to give 1M channels. You are right that this isn't exactly the same as a 1M point FFT. The main difference you'll see is scalloping on the edge

[casper] 1 M Channel turorial

2014-10-10 Thread Edgardo Huaracán Durán
Hi all, I’m trying to understand the approach you use in the 1 M channel tutorial situated in the old tutorial link ( https://casper.berkeley.edu/wiki/Old_Tutorials) called high resolution spectrometer. I've take a look at other similar implementations like ''A 6*320-MHz 1024-Channel FFT Cross-Sp