[casper] CASPER Workshop 2018 Reminder–Deadline ( 31st Aug ) for Registration and Abstract Submission

Dear Colleagues, As a reminder, I would like to encourage you to finish registration and abstract submission as soon as possible, the deadline is 31stAug. http://casper2018.csp.escience.cn/ If you need an invitation letter for VISA application, I would suggest you to send us the required

Re: [casper] New Wideband Spectrometer Designs

Hi John, Homin and CASPER lists,I think most of the useful content has been expressed already, I’ll only state that my interest in ultra-fast ADC work continues, and I look forward to discussions at the workshop.  I’ll trot out my venerable table of high speed ADCs again, many of you have seen

Re: [casper] Inverse of fft_wideband_real

Thanks, Dave for the tutorial, and thanks, Jack. Jack you say: > On Aug 14, 2018, at 6:01 PM, Jack Hickish wrote: > > The biplex FFT which Dave mentions does all the 2 x real = 1 x complex > tricks. However, in the fft_wideband_real block, this is followed by a > parallel FFT direct block

Re: [casper] Inverse of fft_wideband_real

While we're on this fun topic... The biplex FFT which Dave mentions does all the 2 x real = 1 x complex tricks. However, in the fft_wideband_real block, this is followed by a parallel FFT direct block which doesn't have any of these optimizations, and is thus ~2x bigger than it needs to be. This

Re: [casper] Inverse of fft_wideband_real

Hi, Jonathan, The biplex FFT has two complex inputs and two complex outputs. The two input signals are presented "in parallel" (i.e. simultaneously) one sample per input per FPGA cycle, but the output spectra appear serially (i.e. one signal's spectrum followed by the other signal's spectrum)

Re: [casper] Inverse of fft_wideband_real

Thanks for the response, Jack. Hope you are properly caffeinated today ;) I thought Alex put our application question really clearly, and he’s building some very nice bitcodes to see how the various processes work. I’d like to ask you, and the community, some simpler meta questions which

[casper] Job oppertulities

Hi Casperities, XAO (Xinjiang Astronomical Observatory, China) is looking for digital signal processing engineers. This is two year post-doc project, the salary is start at ~20,000 yuan/month. The candidate must have at least Master's degree, however, PHD would be preferred with relevant

Re: [casper] Inverse of fft_wideband_real

Hi Alex, I don't know if there's a way to avoid generating the full spectra prior to taking the fft (I suspect if there is, it just pushes the buffering somewhere else), but it certainly seems like you should be able to do FFTs of two streams, A, B, in parallel. I would think this would work by