Hi Michael, Just so everyone is on the same page -- does your issue only show up in hardware like Andrew/Jonathon's - i.e., in simulation the FFT works ok?
Jack On 3 November 2015 at 00:57, Michael D'Cruze < [email protected]> wrote: > Dear all, > > > > Following on from the email thread from Jonathan Kocz and Andrew Martens > about odd FFT outputs…. > > > > I’ve been experiencing similar inexplicable problems for a while now. > Every other channel in my output is invariably a zero. I’ve tried > everything I can think of, including solutions along the lines of those > observed to work by Jonathan and Andrew (black-boxing, changing mask > parameters etc.), in addition to wiping clean my libraries and re-syncing > with casper-astro-soak-test. I’ve even re-drawn the entire model from > scratch. The results are always the same. Below is a link to an example > output. > > > > https://dl.dropboxusercontent.com/u/38103354/32k_test_image.png > > > > Hopefully it’s clear from a_0 (note that a_0 is zoomed in, a_1 is not) > that every other channel outputs zero, and the interleaved a_0 and a_1 > spectra (to form the full 32k channel spectrum) are interleaving correctly > to produce pairs of zeroes. I’ve been trying various things for quite a > while now, without success and would appreciate some suggestions…! > > > > Thanks > > Michael >
