dfdad21e3f
C-Netz: Work on system informations, metering and call queues
...
- Make system informations configurable
- Simulate call mertering
- Support for call queues on busy voice channels
2017-09-01 18:42:51 +02:00
538b4a42ec
Add wave file playback to replace TX audio
2017-07-15 07:38:16 +02:00
57d4d1739e
AMPS/C-Netz: Correctly release pending transaction when creating a new one
...
If transactions is created, look on all channels for pending transaction
with same subscriber.
1. Remove that transaction.
2. Make channel return to IDLE.
3. Release call, if callref exists.
2017-06-10 13:08:22 +02:00
6adfcf7466
Status display
...
Alows to show status of current channels and users
2017-06-10 13:08:21 +02:00
76a3484c5c
C-Netz: Make demodulation algorithm (slope or leve) slectable via option
...
By default (auto), the algorithm is selected, depending on sound card
or SDR usage. For testing and debugging purpose, the algorithm can be
forced.
2017-05-19 19:11:59 +02:00
ef7ff26793
C-Netz: SDR now uses zero-crossing to detect level changes.
...
This does not work with analog radio, but with SDR it works.
The quality should be better and the process is faster.
2017-05-17 20:06:46 +02:00
4d10ee7c82
No "sdr" audio device option required anymore (when using SDR)
2017-05-17 20:06:42 +02:00
ca10048e5c
Rename filter -> iir_filter (file name and instance name)
...
This is useful when using fir_filter in the future.
2017-05-15 21:46:32 +02:00
4de1e0188d
C-Netz: Add low pass filter to eliminate high frequency noise
...
This improves the FSK decoding quite allot, especially with SDR.
2017-02-18 21:02:52 +01:00
5f1d7bc970
C-Netz: Improve clock speed measurements.
...
Sound card's clock measurements only requires a few minutes to get sub-ppm
accuracy results.
2017-02-18 21:02:46 +01:00
faa3dfb7d4
C-Netz: Make average to clock measurements for a quicker result
2017-02-18 21:01:19 +01:00
8cb0187133
C-Netz: Remove the obviously useless noise function for unused timeslots
2017-02-18 21:01:17 +01:00
7ea3bc188d
Move samples of int16_t format to sample_t, that is of type double
...
This prepares the correction of all levels
2017-02-18 21:01:08 +01:00
9ff8c3bb25
Rework on audio interface
...
Sound instance is now called audio instance and uses funcation pointers.
This gives a clean interface to be exchanged with other technologies,
linke SDR.
2017-02-18 21:00:45 +01:00
d54d3ac265
prepare audio handling for multi carrier SDR
2017-01-07 06:28:24 +01:00
e34d74aa23
C-Netz: Simplifying TX signal clock sync between two channels
2016-11-30 18:09:38 +01:00
b1c452cf12
Changed command line options
...
* All lower case options define common options
* All upper case options define network specific options
2016-11-27 22:06:47 +01:00
17930af920
C-Netz: callref is moved completely to transaction object
2016-10-02 09:06:04 +02:00
8d7c7f4425
callref: Move callref from 'sender' to individual implementation of a, b, c-netz
...
Cellular networks use transaction instances, so callref is now member of
transaction object.
2016-10-02 09:06:03 +02:00
e4079b8ce8
C-Netz: Fix release cause coding
2016-08-03 12:03:54 +02:00
664f8c7ac0
C-Netz: retry call setup messages up to 3 times
2016-08-01 12:15:12 +02:00
6a5af9aeac
Typos: acknowledgement -> acknowledgment signalling -> signaling
2016-07-24 12:31:08 +02:00
2ee51022f4
Rename 'compander' to 'compandor'
2016-06-20 19:37:56 +02:00
051cc81b13
C-Netz: Move transaction routines to seperate file
2016-06-12 16:11:20 +02:00
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
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
57ba648ac4
C-Netz: Add tiny database to track if phones are online
...
Reject calls, if not online.
Use an interval to check if the phones are still online.
2016-05-08 15:53:00 +02:00
bae12156a2
common code: Add input gain option
2016-05-08 15:49:45 +02:00
7434e21dc2
Multi transceiver support
...
This can be multiple transceivers on multiple sound cards.
Two transceivers can be bundled on one sound device as well, using both channels.
2016-05-08 15:48:13 +02:00
16acdbf59d
Implementation of C-Netz (German mobile telephone system)
2016-04-24 15:19:00 +02:00
Andreas Eversberg