kopia lustrzana https://github.com/F5OEO/PiFmRds
Spectrum plot!
rodzic
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@ -6,6 +6,15 @@ Pi-FM-RDS
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This program generates an FM modulation, with RDS (Radio Data System) data generated in real time. It can include monophonic or stereophonic audio.
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This version modulates the PLL instead of the clock divider for superior signal purity. The harmonics are unaffected, so the [legal warning](#warning-and-disclaimer) still applies.
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![](doc/spectrum.png)
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TODO list
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watchdog for PLL settings (the GPU changes them sometimes, like brownout)
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( force_turbo=1 may help prevent this)
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measure PLL loop filter response
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It is based on the FM transmitter created by [Oliver Mattos and Oskar Weigl](http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter), and later adapted to using DMA by [Richard Hirst](https://github.com/richardghirst). Christophe Jacquet adapted it and added the RDS data generator and modulator. The transmitter uses the Raspberry Pi's PWM generator to produce VHF signals.
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It is compatible with both the Raspberry Pi 1 (the original one) and the Raspberry Pi 2 and 3.
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