- Travis:
MonoFM is based on SoftFM which is a software-defined radio receiver for FM broadcast radio. It is written in C++ and uses RTL-SDR to interface with RTL2832-based hardware.
Forked from http://github.com/jorisvr/SoftFM
Original Code has been modified
- to use RTAudio instead of ALSA so it can work on Mac OSX
- demonstrate parts of spuce library
- modified to only do mono FM demod
- use hard-coded IF sampling rate of 1.152MHz
- use hard-coded audio sample rate of 48kHz
- Thus a fixed downsampling ratio of 24 is used to go from IF -> Audio
- This is done in 2 stages, the first is a factor of 6 before FM discriminator, the 2nd is 4 after the discriminator
MonoFM provides:
- real-time playback to soundcard or dumping to file
- command-line interface (no GUI, no visualization, nothing fancy)
MonoFM requires:
- RtAudio
- C++11
- spuce http://github.com/audiofilter/spuce.git
- RTL-SDR library (http://sdr.osmocom.org/trac/wiki/rtl-sdr)
- supported DVB-T receiver
- medium-strong FM radio signal
The Osmocom RTL-SDR library must be installed before you can build SoftFM. See http://sdr.osmocom.org/trac/wiki/rtl-sdr for more information. SoftFM has been tested successfully with RTL-SDR 0.5.3.
To install MonoFM, install dependencies (see .travis.yml), download and unpack the source code and go to the top level directory. Then do like this:
mkdir build
cd build
cmake ..
make
./monofm -f <radio-frequency-in-MHz>CMake tries to find librtlsdr. If this fails, you need to specify the location of the library in one the following ways:
cmake .. -DCMAKE_INSTALL_PREFIX=/path/rtlsdr
cmake .. -DRTLSDR_INCLUDE_DIR=/path/rtlsdr/include -DRTLSDR_LIBRARY_PATH=/path/rtlsdr/lib/librtlsdr.a
PKG_CONFIG_PATH=/path/rtlsdr/lib/pkgconfig cmake ..--
License
See files for Licensing. If no License, info, then code is forked code from SoftFM , copyright (C) 2013, Joris van Rantwijk
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html
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