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2017-08-09Add incoming answer to call control, also allow to send recall toneAndreas Eversberg1-0/+1
2017-08-08Move Hagelbarger error correction code from NMT to common codeAndreas Eversberg2-5/+9
It will be used by Radiocom 2000 also. Some minor fixes and improvements apply.
2017-08-08Move FFSK modem from NMT to common code, so it can be used by other networksAndreas Eversberg1-5/+5
2017-08-08NMT: Implement Hagelbarger CodeAndreas Eversberg2-1/+38
This will correct burst errors of received messages. If the message is too corrupted, it will be ignored, because some element may not match then. The digits and line signals are checked for consistency, since they are repeated serveral times in a message.
2017-07-15Minor fixes to compandorAndreas Eversberg2-22/+37
2017-05-15Rename filter -> iir_filter (file name and instance name)Andreas Eversberg3-20/+20
This is useful when using fir_filter in the future.
2017-02-18SoapySDR supportAndreas Eversberg1-0/+5
There is no time stamp handling. It is just TX'ing in advance and synchronous to received RX rate.
2017-02-18Add test to measure performance of FM modulation and filteringAndreas Eversberg2-1/+78
2017-02-18Correcting all levels and move all remaining integer samples to sample_tAndreas Eversberg2-6/+6
The leves are based on the standards of each mobile network. They are adjusted to the specified frequency deviation now.
2017-02-18Add global DC-Filter and remove all individual DC-FiltersAndreas Eversberg1-0/+1
2017-02-18Work on emphasis filter: Neutral @ 1000 Hz; Use filter before de-emphasisAndreas Eversberg1-31/+33
2017-02-18Test filter uses a dB graph to show the response graphicallyAndreas Eversberg1-22/+3
2017-02-18Move samples of int16_t format to sample_t, that is of type doubleAndreas Eversberg5-12/+17
This prepares the correction of all levels
2017-02-18Filter improvement: LP and HP filters, added test functionAndreas Eversberg2-0/+135
The -3 dB level at cut-off frequency is now maintained for multiple iterations.
2017-02-18Support for UHD SDR interfaceAndreas Eversberg1-0/+3
2017-01-07NMT: Rework on FSK process, no more requirement for special sample ratesAndreas Eversberg1-3/+6
2016-10-23C-Netz: Use emphasis with 200 uS time constantAndreas Eversberg1-2/+2
2016-08-03Add info key 'i' to show some states.Andreas Eversberg1-1/+1
Currently showing C-Netz attached subscribers
2016-07-24Remove console line before printing debugging and on exitAndreas Eversberg2-2/+15
2016-07-24Cleanup warnings at autoconfig filesAndreas Eversberg1-0/+1
2016-07-24NMT: Various fixes for SMS supportAndreas Eversberg2-4/+20
2016-07-09NMT / SMS: Short Message Service supportAndreas Eversberg2-1/+131
2016-07-09NMT / DMS: User data facility support (required for SMS)Andreas Eversberg2-1/+273
2016-06-20Rename 'compander' to 'compandor'Andreas Eversberg2-6/+6
2016-05-13common code: Fixed de-emphasis by adding high pass filterAndreas Eversberg1-24/+22
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.
2016-05-01common code: Make preemphasis 0 dB @ 1000 HzAndreas Eversberg1-0/+2
2016-04-24common: Add pre and de emphasis, if the radio does not support itAndreas Eversberg2-1/+84
Connect to the oscillator of the transmitter - good girl! You need to enable pre emphasis in this case. Connect to the discriminator of the receiver - good boy! You need to enable de emphasis in this case.
2016-04-24Fixing companderAndreas Eversberg2-0/+134