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Al Grant (@bigalnz)


Re: Polyphase filter assistance

Reply posted 1 month ago (06/18/2024)
Right - and can I still make some "measure" (dbfs?) of signal power when I am using this FFT channelizer approach?

Re: Polyphase filter assistance

Reply posted 1 month ago (06/18/2024)
Thanks. I guess what I am asking is, with PFB, can you have for example 4 filters, at arbitary positions of differing bandwidths - like the picture below where...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/18/2024)
Yes you raise good points about the simplicity of the current approach, and I need to do more testing.Putting aside the PFB approach for a minute, is there a case...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/18/2024)
Yes - that was exactly it.This FFT channelizer approach appears to be *very* efficient and testing on good strong signals so far it is working well. I am going to...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/17/2024)
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Re: Polyphase filter assistance

Reply posted 1 month ago (06/17/2024)
Is this extra beep indicated by arrow in the middle (not worried about the total number)My plot on left (samples loaded without modification)FFT channelized plot...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/17/2024)
Hi Lito844,Thanks for the reply. My transmitters should transmit beeps at a normalized rate of 80 beeps per/minute in the test signal. They vary slightly in time...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/17/2024)
Perhaps a differrent appraoch to the question. My original method for 1 signal with FIR looked like: sample_rate = 768000 center_freq = 160425000 size = len(samples) x...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/17/2024)
That could help - do you have an example of a FFT channelizer that incorporates a filter?

Re: Polyphase filter assistance

Reply posted 1 month ago (06/16/2024)
I have made a Juypter notebook showing my original method (spawning FIR filters and smoothing on full bandwidth (not efficient)) and a fft channelized method.The...

Re: Polyphase filter assistance

Reply posted 1 month ago (06/13/2024)
That would be superhelpful. Here is a recording : https://geekhelp-my.sharepoint.com/:f:/g/personal/...And I have included a info text file with the details but...

Polyphase filter assistance

New thread started 1 month ago
I am a hobbyist programmer, and for "fun" are trying decode signals from a wildlife tracker to assist with a local conservation project.With assistance from the...

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