From 61351e76bb7192495d7766f9349eda642cad144c Mon Sep 17 00:00:00 2001 From: Christophe Jacquet Date: Sun, 6 Apr 2014 21:44:42 +0200 Subject: [PATCH] Documentation++ --- README.md | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 61465de..7387e87 100644 --- a/README.md +++ b/README.md @@ -3,11 +3,10 @@ Pi-FM-RDS ## FM-RDS transmitter using the Raspberry Pi's PWM -## by Christophe Jacquet, F8FTK This program generates an FM modulation, with RDS (Radio Data System) data generated in real time. -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). +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 transmitter. ## How to use it? @@ -99,6 +98,9 @@ The shaped biphase symbol is generated by a Python program called `generate_wave The samples are played by `pi_fm_rds.c` that is adapted from Richard Hirst's [PiFmDma](https://github.com/richardghirst/PiBits/tree/master/PiFmDma). The program was changed to support a sample rate of precisely 228 kHz, four times the RDS subcarrier's 57 kHz. +### References + +* [EN 50067, Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range 87.5 to 108.0 MHz](http://www.interactive-radio-system.com/docs/EN50067_RDS_Standard.pdf) --------