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sharebrained / portapack-hackrf

Portability Add-On for the HackRF Software-Defined Radio.
GNU General Public License v2.0
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Provide waterfall in receiver WFM mode #16

Closed jboone closed 8 years ago

jboone commented 9 years ago

Code needs to be restructured to do fewer FFTs due to less available CPU cycles. So time-domain coverage will be poorer than in other modes. But it'd still be useful to have...

aernan commented 9 years ago

I would use this feature. Even if you could not see as much of the spectrum.

KC5CQW commented 9 years ago

Useful for visualizing modulation drive and deviation. It need not have a high resolution as most WFM signals are audio only. The display refresh can be in the order of seconds or long enough for an average spoken sentience to be graphically populated on the screen. (5-10 sec.)

aernan commented 9 years ago

Many WFM signals have a HD Radio signal on them as well. Would be nice to see the waveform to see if HD is there. http://hdradio.com/ https://www.ibiquity.com/technology

KC5CQW commented 9 years ago

Agreed! This is a basic feature found in GQRX.

On Aug 6, 2015, at 11:11, aernan notifications@github.com wrote:

Many WFM signals have a HD Radio signal on them as well. Would be nice to see the waveform to see if HD is there. http://hdradio.com/ https://www.ibiquity.com/technology

— Reply to this email directly or view it on GitHub.

jboone commented 9 years ago

Quick implementation in "wfm_waterfall" branch, but scrolls too quickly and hangs sometimes. A debugger will be necessary, and I don't have one on-hand at the moment.

jboone commented 9 years ago

Initial filtering and decimation steps may need to be tweaked. CIC filter characteristics seem to be visible in the waterfall, which reduces its utility.

jboone commented 8 years ago

Duplicate of #63, which is now closed.