williamp/osmocom-analog
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bd7ccc5fa05587606757adbacb6e1bf12f12fd2c
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7 Commits

Author SHA1 Message Date
Andreas Eversberg
bd7ccc5fa0 Add global DC-Filter and remove all individual DC-Filters 2017-02-18 21:01:12 +01:00
Andreas Eversberg
71e556e7ff Work on emphasis filter: Neutral @ 1000 Hz; Use filter before de-emphasis 2017-02-18 21:01:11 +01:00
Andreas Eversberg
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
Andreas Eversberg
1ea95de120 C-Netz: Use emphasis with 200 uS time constant 2016-10-23 08:46:05 +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
0c99848120 common code: Make preemphasis 0 dB @ 1000 Hz 2016-05-01 15:14:57 +02:00
Andreas Eversberg
4356c93afa common: Add pre and de emphasis, if the radio does not support it 
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.
 2016-04-24 15:14:56 +02:00