• Miroslav Slugen's avatar
    [media] xc4000: add support for signal strength measures · 8a538a88
    Miroslav Slugen authored
    In xc4000 chipsets real signal and noise level is stored in register
    0x0A and 0x0B,so we can use those registers to monitor signal strength.
    
    I tested this patch on 2 different cards Leadtek DVR3200 and DTV2000H
    Plus, both with same results, I used special antenna hubs (toner 4x, 6x,
    8x and 12x) with mesured signal lost, both registers are in dB value,
    first represent signal with limit value -113.5dB (should be -114dB) and
    exactly match with test results. Second represents noise level also in
    dB and there is no maximum value, but from tests we can drop everything
    above 32dB which tuner realy can't use, signal was usable till 20dB
    noise level.
    
    In digital mode we can take signal strength but sadly noise level is not
    relevant and real value is stored in demodulator for now just zl10353,
    also digital mode is just for testing, because it needs changing other
    parts of code which reads data only from demodulator.
    
    In analog mode I was able to test only FM radio, signal level is not
    important, it says something about cable and hub losts, but nothing
    about real quality of reception, so even if we have signal level at
    minimum 113dB we can still here radio, because of that it is displaied
    only in debug mode, but for real signal level is used noise register
    which is again very accurate, radio noise level was betwen 6-20dB for
    good signal, 20-25dB for medium signal, and above 25dB signal is
    unusable.
    
    For now real benefit of this patch is only for FM radio mode.
    Signed-off-by: default avatarMiroslav Slugen <thunder.mmm@gmail.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
    8a538a88
xc4000.c 44.3 KB