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License: GNU Lesser General Public License v2.1
Copy of Codec2 repository (https://svn.code.sf.net/p/freetel/code/)
License: GNU Lesser General Public License v2.1
Codec 2 README -------------- Codec 2 is an open source (LGPL 2.1) low bit rate speech codec: http://rowetel.com/codec2.html Also included: + FDMDV modem (README_fdmdv.txt) for HF channels + Coherent PSK (cohpsk) for HF channels + FSK modem (README_fsk.txt) for VHF channels + an OFDM modem for HF channels (ofdm) + the FreeDV API - a library for embedding FreeDV in other programs SVN Repository -------------- Check out the latest (development branch) code using: $ svn co https://svn.code.sf.net/p/freetel/code/codec2-dev codec2-dev There are unauthorised 3rd party GIT mirrors of Codec 2. GIT IS NOT SUPPORTED!!! All patches, support questions etc, need to be against the SVN repository above. Quickstart ---------- Also see INSTALL for more general building and installing instructions. 1/ Listen to Codec 2: $ cd codec2-dev $ mkdir build_linux $ cd build_linux $ cmake .. $ make $ ./src/c2demo ../raw/hts1a.raw hts1a_c2.raw $ play -t raw -r 8000 -e signed-integer -b 16 ../raw/hts1a.raw $ play -t raw -r 8000 -e signed-integer -b 16 ./hts1a_c2.raw 2/ Compress, Decompress and then play a file: using 2400 bps bit rate encoding $ ./src/c2enc 2400 ../raw/hts1a.raw hts1a_c2.bit $ ./src/c2dec 2400 hts1a_c2.bit hts1a_c2_2400.raw which can be played with $ play -t raw -r 8000 -e signed-integer -b 16 ./hts1a_c2_2400.raw using 700 bps bit rate encoding $ ./src/c2enc 700 ../raw/hts1a.raw hts1a_c2.bit $ ./src/c2dec 700 hts1a_c2.bit hts1a_c2_700.raw which can be played with $ play -t raw -r 8000 -e signed-integer -b 16 ./hts1a_c2_700.raw 3/ Same thing with pipes: $ ./src/c2enc 1300 ../raw/hts1a.raw - | ./src/c2dec 1300 - - | play -t raw -r 8000 -s -2 - Programs -------- 1/ c2demo encodes a file of speech samples, then decodes them and saves the result. 2/ c2enc encodes a file of speech samples to a compressed file of encoded bits. 3/ c2dec decodes a compressed file of bits to a file of speech samples. 4/ c2sim is a simulation/development version of Codec 2. It allows selective use of the various Codec 2 algorithms. For example switching phase modelling or LSP quantisation on and off. Debugging --------- 1/ To compile with debug symbols for using gdb: $ cd ~/codec2 $ rm -Rf build_linux && mkdir build_linux $ cd build_linux $ CFLAGS=-g cmake .. $ make 2/ For dump file support: $ cd ~/codec2 $ rm -Rf build_linux && mkdir build_linux $ cd build_linux $ CFLAGS=-DDUMP cmake .. $ make Building Unit Tests ------------------- The unittests are no longer built by default. They require libsamplerate and Speex. To build them: $ cd ~/codec2 $ rm -Rf build_linux && mkdir build_linux $ cd build_linux $ cmake -DCMAKE_BUILD_TYPE=Debug .. $ make Directories ----------- cmake - cmake support files octave - Octave scripts used to support development script - shell scripts for playing and converting raw files src - C source code for Codec 2, FDMDV modem, COHPSK modem, FreeDV API raw - speech files in raw format (16 bits signed linear 8 kHz) stm32 - STM32F4 microcontroller and SM1000 FreeDV Adaptor unittest - unit test source code wav - speech files in wave file format Octave Packages --------------- To run the Octave scripts the following libraries are required: Package Name | Version | Installation directory --------------+---------+----------------------- control *| 2.6.2 | /usr/share/octave/packages/control-2.6.2 general *| 1.3.4 | /usr/share/octave/packages/general-1.3.4 parallel *| 2.2.0 | /usr/share/octave/packages/parallel-2.2.0 plot *| 1.1.0 | /usr/share/octave/packages/plot-1.1.0 signal *| 1.2.2 | /usr/share/octave/packages/signal-1.2.2 specfun *| 1.1.0 | /usr/share/octave/packages/specfun-1.1.0 These can be installed using your systems package management system or the Octave package management system. The version number of each package is not important. FreeDV API ---------- See freedv_api.h and freedv_api.c, and the demo programs freedv_tx & freedv_rx. Quickstart demo using FreeDV 1600: $ ./freedv_tx 1600 ../../raw/hts1.raw - | ./freedv_rx 1600 - - | play -t raw -r 8000 -s -2 -q - $ cat freedv_rx_log.txt FreeDV 2400A and 2400B modes ---------------------------- FreeDV 2400A and FreeDV 2400B are modes designed for VHF radio. FreeDV 2400A is designed for SDR radios (it has a 5 kHz RF bandwidth), however FreeDV 2400B is designed to pass through commodity FM radios. Demos of FreeDV 2400A and 2400B: $ ./freedv_tx 2400A ../../raw/ve9qrp_10s.raw - | ./freedv_rx 2400A - - | play -t raw -r 8000 -s -2 - $ ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | ./freedv_rx 2400B - - | play -t raw -r 8000 -s -2 - Note for FreeDV 2400A/2400B the modem signal sample rate is 48kHz. To listen to the modem tones from FreeDV 2400B, or play them into a FM HT mic input: $ ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | play -t raw -r 48000 -s -2 - Simulate FreeDV 2400B passing through a 300 to 3000 Hz audio path using sox to filter: $ ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | sox -t raw -r 48000 -s -2 - -t raw - sinc 300-3000 | ./freedv_rx 2400B - - | play -t raw -r 8000 -s -2 - Links: FreeDV 2400A blog post ...: http://www.rowetel.com/?p=5119 FreeDV 2400A & 2400B demos: http://www.rowetel.com/?p=5219
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