Andreas Eversberg
a6bd841247
NMT: Various fixes for SMS support
2016-07-24 12:31:05 +02:00
Andreas Eversberg
3ef9ef88bd
B-Netz: Compiler switch to generate a dial sequence (for testing)
2016-07-24 12:30:56 +02:00
Andreas Eversberg
2137db0e01
NMT: Autoanswer for SMS/DMS calls
2016-07-09 15:16:17 +02:00
Andreas Eversberg
e7fa08b6df
NMT / SMS: Short Message Service support
2016-07-09 15:16:16 +02:00
Andreas Eversberg
64c829909b
NMT / DMS: User data facility support (required for SMS)
2016-07-09 11:27:24 +02:00
Andreas Eversberg
62b3712ce5
common code: Check and ignore events without callref set
2016-07-09 11:27:02 +02:00
Andreas Eversberg
f39ee2f15a
common code: Add support for main loop handler
2016-07-09 11:27:02 +02:00
Andreas Eversberg
26ab26db48
minor fix at MNCC socket
2016-07-09 11:27:02 +02:00
Andreas Eversberg
44ebf1616a
work on docs
2016-07-07 16:25:55 +02:00
Andreas Eversberg
ab9aba1a84
B-Netz: Reply the station ID correctly
...
It must be replied right after it has been received the first time.
It does not matter if this happens a bit later, even a second later.
Thanx to Hans Wigger for providing recording from his B-Netz tester to
figure this out.
2016-07-06 16:19:01 +02:00
Andreas Eversberg
54266a9937
Minor fixup to .gitignore: ignore test_compandor
2016-07-06 16:18:51 +02:00
Andreas Eversberg
f3fd01ebcd
ALSA code: Fixed corrupted sample at the end of a read
...
The last sample may get corrupted. It seems that this depends on the
card that is used. To fix this, the snd_pcm_avail is checked and
one sample less than available is read using snd_pcm_readi. This
sample remains in RX buffer until next read. Then it is not corrupted.
2016-07-02 08:04:43 +02:00
Andreas Eversberg
4719be95bd
work on docs
2016-07-02 08:01:34 +02:00
Andreas Eversberg
2ee51022f4
Rename 'compander' to 'compandor'
2016-06-20 19:37:56 +02:00
Andreas Eversberg
86daa5a64a
AMPS: Add option to use the BUSY/IDLE bit on FOCC
2016-06-20 17:16:46 +02:00
Andreas Eversberg
76f6285846
AMPS: Show round trip delay of Filler frames in loopback mode
2016-06-20 17:15:42 +02:00
Andreas Eversberg
d851c37eac
common code: Release MNCC call 30 seconds after listening to announcement
2016-06-19 17:46:56 +02:00
Andreas Eversberg
b45b0c6bac
common code: Minor fix in main loop
2016-06-19 17:43:48 +02:00
Andreas Eversberg
f87e36fa47
AMPS: Detect difference between paging response and call response
...
Release call, if paging response was received, after call from fixed
network has already been released.
2016-06-19 17:41:42 +02:00
Andreas Eversberg
2b61a2ca4a
Work on docs
2016-06-19 11:09:03 +02:00
Andreas Eversberg
673aa74e6c
AMPS: Various minor fixes
2016-06-19 11:03:59 +02:00
Andreas Eversberg
4d52f955b3
common code: Add processing interval option to decrese CPU usage
2016-06-18 19:33:08 +02:00
Andreas Eversberg
e10898c1e8
C-Netz: Minor cosmetic fixes
2016-06-18 08:05:18 +02:00
Andreas Eversberg
d2c4ca4fa9
Implementation of Advanced Mobile Phone Service (AMPS)
2016-06-17 17:03:29 +02:00
Andreas Eversberg
7d5d3da8d3
Add function to display wave form from input/loop
...
Use 'w' to toggle display.
Move terminal input processing and main loop to main_common.c
2016-06-17 17:03:28 +02:00
Andreas Eversberg
4e0e13cb2d
work on docs
2016-06-17 17:03:27 +02:00
Andreas Eversberg
1d20119d85
common code: Call control allows to re-dial after disconnect
...
No hangup key required before that anymore.
2016-06-12 16:16:37 +02:00
Andreas Eversberg
7cfd11eb17
common code: Add feature to select debug category rather than showing all
2016-06-12 16:14:29 +02:00
Andreas Eversberg
051cc81b13
C-Netz: Move transaction routines to seperate file
2016-06-12 16:11:20 +02:00
Andreas Eversberg
26593ed034
NMT: fix minor bug
2016-06-12 16:11:20 +02:00
Andreas Eversberg
4d22b11855
common code: Add debug #define for capture generated singal
...
Used for fundamental debugging of encoded signal
2016-06-12 16:11:20 +02:00
Andreas Eversberg
c933250685
Add dsp mode change fuction to A and B Netz, fixed NMT
2016-06-12 16:11:20 +02:00
Andreas Eversberg
997f8eda43
B-Netz: Add timer for switching back from calling channel
...
The timer ensures that the paging sequence is sent out by sound card before
switching back to traffic channel
2016-05-29 17:17:49 +02:00
Andreas Eversberg
1ceb3026dd
Fixed link problem with alsa lib
...
Thanx to Martin for pointing to this problem.
2016-05-16 18:41:21 +02:00
Andreas Eversberg
90dbc0cbd7
C-Netz: Debug fixes
2016-05-15 20:44:07 +02:00
Andreas Eversberg
50136d7e8a
NMT: Typo in channel list
2016-05-15 20:43:58 +02:00
Andreas Eversberg
e9640c0cd8
C-Netz: Fix TX polarity selection
2016-05-15 20:43:49 +02:00
Andreas Eversberg
9ecb87f3e6
Fixing station ID command line parameter
2016-05-15 20:43:38 +02:00
Andreas Eversberg
7aa2445b47
Move amplitude (level) debugging to debug.c
2016-05-15 20:37:06 +02:00
Andreas Eversberg
adc3270dc0
Acknowledgements
2016-05-13 20:44:47 +02:00
Andreas Eversberg
60d9a7b496
C-Netz: Advice about requirement of emphasis done by software
2016-05-13 19:23:43 +02:00
Andreas Eversberg
c2cfce2373
wip: docs
2016-05-13 09:37:03 +02:00
Andreas Eversberg
46fa72894e
C-Netz: Calibration/fix processing of tone levels on TX and RX side
...
FSK and compander levels are adjusted.
Eliminate offsets between subsequent speech chunks. This is done by
high-pass filter. An offset is not passed to the filter.
Do correct audio processing chain:
time compress -> compressor -> scrambler / pre-emphasis -> TX
RX -> de-scrambler / de-emphasis -> expander -> time expand
2016-05-13 09:37:03 +02:00
Andreas Eversberg
5a9c9c7401
C-Netz: Send 5280 Hz test tone on idle speech channel
2016-05-13 09:37:03 +02:00
Andreas Eversberg
bbab972b51
NMT: Fixup paging on other channel
2016-05-13 09:37:03 +02:00
Andreas Eversberg
69ccdb99b5
NMT: Calibration of tone levels on TX and RX side
2016-05-13 09:37:03 +02:00
Andreas Eversberg
27e8b03df5
Fixup typo on jitter code
2016-05-13 09:37:02 +02:00
Andreas Eversberg
42eefe90bf
common code: Fixed de-emphasis by adding high pass filter
...
This high-pass filter filters out DC and frequencies below 300 Hz.
Now de-emphases will not cause low frequencies to saturate audio level
range or cause too high levels on low frequencies.
2016-05-13 09:37:02 +02:00
Andreas Eversberg
3a54f46b81
C-Netz: Fixup debug output at database
2016-05-13 09:37:02 +02:00
Andreas Eversberg
e2a9c2c6a5
Automatic FSK polarity selection on TX side
...
This is done by simulating two cells with different polarities.
On first message from mobile station, the cell with the correct
polarity is used, the other is disabled.
On RX side the polarity is not selected, since FSK decoder detects
polarity for every frame.
2016-05-13 09:37:01 +02:00