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SoftFM
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56 Commits

Author SHA1 Message Date
Divye Kapoor e9fe05c4ea Be accurate in disallowing sampling rates in SoftFM. 
The rtl-sdr driver code disallows most of the sampling rates below
900 kS/s. However, it allows a small window of sampling rates
between [250001, 300000]. The update to the conditional is along
the lines of the conditions imposed by the RTL SDR driver here:

http://cgit.osmocom.org/rtl-sdr/tree/src/librtlsdr.c

The default sampling rate of 1 MS/s causes severe buffer underruns on
a Raspberry Pi 2. However choosing a sampling rate of 250 kS/s and
lower values for PCM sampling causes successful FM demodulation of
strong FM stations on the device.
 2015-11-21 08:20:44 +00:00
Joris van Rantwijk fc30717198 Add pthread library in CMakeList. This is required for C++11 threads. 2015-06-02 20:45:37 +02:00
Joris van Rantwijk c4c6c79765 Removed failed ideas from TODO list. 2014-05-31 21:07:04 +02:00
Joris van Rantwijk 6a5ccbb818 Tried LNA gain adjustments but it does not help for the DIY antenna. 2014-05-29 21:32:32 +02:00
Joris van Rantwijk 844d0c1684 Merge remote-tracking branch 'origin/master' 2014-05-29 20:51:51 +02:00
Joris van Rantwijk 640c75038b Add RDS demodulation stuff to pyfm.py. 2014-05-29 19:19:19 +02:00
Joris van Rantwijk ca411c57e1 Wait a bit longer before accepting stereo lock. 2014-05-29 18:28:59 +02:00
Joris van Rantwijk 5b547da40d Add note about RTL-SDR version 0.5.3. 2014-05-29 14:42:21 +02:00
Joris van Rantwijk ec8fc6bee3 Disable RTL AGC mode by default. 2014-05-29 13:56:15 +02:00
Joris van Rantwijk 4f90345a52 Disable RTL AGC mode by default. 2014-01-26 21:42:01 +01:00
Joris van Rantwijk c2de34860a Implement command-line option for LNA gain. 2014-01-26 20:31:38 +01:00
Joris van Rantwijk 5744e0affd Tried reducing PLL bandwidth; does not improve stereo sound. 2014-01-23 21:48:21 +01:00
Joris van Rantwijk 860c2db7bd Remove unnecessary special case for PPS output. 2014-01-22 23:11:39 +01:00
Joris van Rantwijk 0ffd44f3fd More pilot frequency measurements. 2014-01-22 23:10:23 +01:00
Joris van Rantwijk fda975b1ff Measured radio2 pilot frequency. 2014-01-20 07:50:15 +01:00
Joris van Rantwijk 4bff1f823b Tested 19 kHz stability for radio3. 2014-01-19 20:00:17 +01:00
Joris van Rantwijk 6d735bb0f0 Pilot PPS logging works. 2014-01-19 15:49:43 +01:00
Joris van Rantwijk f6bca05bf0 Prepare pilot PLL to produce PPS events. 2014-01-19 12:19:19 +01:00
Joris van Rantwijk cfc5e07db6 Fix incorrect use of uint8_t, FILE, etc. outside std namespace. 2014-01-19 11:43:22 +01:00
Joris van Rantwijk ddcb6a8500 Implement k, M suffixes for frequency and sample rates. 2014-01-18 23:44:25 +01:00
Joris van Rantwijk d19123946e Update TODO list. 2014-01-18 22:24:21 +01:00
Joris van Rantwijk 761b368282 Set RTL AGC mode by default (no improvement), with command-line option to disable. 2014-01-18 20:44:17 +01:00
Joris van Rantwijk ff985cd623 Experimented with IF gain and AGC mode; does not seem to help much. 2014-01-12 22:08:22 +01:00
Joris van Rantwijk 4619295d9a Simulated effects of IF filter bandwidth. 2014-01-12 18:12:53 +01:00
Joris van Rantwijk 13219ed6ba Reorganize notes; measure effect of LNA gain, ADC calibration. 
Python code to experiment with IF filtering.
 2014-01-11 23:19:20 +01:00
Joris van Rantwijk f1b4dc55d6 Add Python functions to demodulate FM and to measure quality of 19 kHz pilot. 2014-01-10 21:32:27 +01:00
Joris van Rantwijk a256775f28 Update notes. 2014-01-09 21:18:44 +01:00
Joris van Rantwijk f9d6cfd0d0 Add comments to Python code. 2014-01-05 22:02:08 +01:00
Joris van Rantwijk 6bce6702d2 Fix mistake in note about forbidden sample rate range. 2014-01-05 22:01:22 +01:00
Joris van Rantwijk d1593544a4 Reject IF sample rates 900kS/s or lower because RTL chip does not support it. 2014-01-05 21:57:53 +01:00
Joris van Rantwijk 7948164205 Better handling of "-d list". 2014-01-05 21:57:53 +01:00
Joris van Rantwijk 6fd7c91e52 Print device name on stderr. 
When invalid device index specified, print list of detected devices.
 2014-01-05 21:57:53 +01:00
Joris van Rantwijk 357451f639 More notes about gain and filters. 2014-01-05 21:56:06 +01:00
Joris van Rantwijk 32dcfdd57f Fix bug in Python code for reading raw samples. 2014-01-05 16:43:38 +01:00
Joris van Rantwijk d4e12c75ce Add notes. Start building Python module with useful algorithms. 2014-01-05 16:33:05 +01:00
Joris van Rantwijk c71a39d3d2 Trivial cleanups in header files. 
Print newline before message in signal handler.
 2014-01-03 22:00:31 +01:00
Joris van Rantwijk 7f1a8bb1d7 Write valid .WAV header with dummy sample count at start of run. 
As a result, the .WAV file is somewhat usable even during the recording run.
 2014-01-03 18:50:12 +01:00
Joris van Rantwijk 829e39594d Print status message saying where audio output is going. 2014-01-03 18:10:37 +01:00
Joris van Rantwijk 8a2cef5e35 Implement .WAV file writing based on Sidney's WavFile.h. 2014-01-03 18:07:28 +01:00
Joris van Rantwijk 3e8c2232d2 Update TODO list. 2014-01-01 17:53:22 +01:00
Joris van Rantwijk f24f42755d Update todo list. 2014-01-01 12:04:38 +01:00
Joris van Rantwijk e650df4bc2 Add README, add license statement. 2014-01-01 12:04:30 +01:00
Joris van Rantwijk f6b0d2b546 Support large output files. 2013-12-31 20:07:46 +01:00
Joris van Rantwijk 0091737339 Switch to cmake for building. 2013-12-31 20:07:11 +01:00
Joris van Rantwijk 47525ef796 Very slight speed improvement in FIR filters. 2013-12-31 15:19:14 +01:00
Joris van Rantwijk cecf407d00 Stereo decoding works. WHEEE!! 2013-12-31 00:56:53 +01:00
Joris van Rantwijk 351e22f9bb Code cleanups. 2013-12-31 00:29:52 +01:00
Joris van Rantwijk f119f2f72c Stereo pilot PLL now working. (Stereo decoding not yet implemented.) 2013-12-31 00:07:14 +01:00
Joris van Rantwijk 620dba5d13 Increase filter order for baseband downsample filter. Add comments. 2013-12-30 15:58:17 +01:00
Joris van Rantwijk 48d605243b Fix bug in option parsing. 2013-12-30 15:24:56 +01:00