mirror
/
F5OEO-PiFmRds
mirror of https://github.com/F5OEO/PiFmRds
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Spectrum plot!

master
SaucySoliton 2017-01-07 07:33:06 +00:00
parent fcfccdd0fe
commit 3a309befa1
2 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
README.md
View File

@ -6,6 +6,15 @@ Pi-FM-RDS
This program generates an FM modulation, with RDS (Radio Data System) data generated in real time. It can include monophonic or stereophonic audio.
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.
![](doc/spectrum.png)
TODO list
watchdog for PLL settings (the GPU changes them sometimes, like brownout)
( force_turbo=1 may help prevent this)
measure PLL loop filter response
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.
It is compatible with both the Raspberry Pi 1 (the original one) and the Raspberry Pi 2 and 3.

BIN
doc/spectrum.png 100644
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 217 KiB