Commit f3ee363f authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

media: dvbproperty.rst: minor editorial changes

Do some minor editorial changes to make this chapter visually
better, and the example a little bit clearer.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 1e1d9c96
...@@ -8,8 +8,8 @@ DVB Frontend properties ...@@ -8,8 +8,8 @@ DVB Frontend properties
Tuning into a Digital TV physical channel and starting decoding it Tuning into a Digital TV physical channel and starting decoding it
requires changing a set of parameters, in order to control the tuner, requires changing a set of parameters, in order to control the tuner,
the demodulator, the Linear Low-noise Amplifier (LNA) and to set the the demodulator, the Linear Low-noise Amplifier (LNA) and to set the
antenna subsystem via Satellite Equipment Control (SEC), on satellite antenna subsystem via Satellite Equipment Control - SEC (on satellite
systems. The actual parameters are specific to each particular digital systems). The actual parameters are specific to each particular digital
TV standards, and may change as the digital TV specs evolves. TV standards, and may change as the digital TV specs evolves.
In the past (up to DVB API version 3), the strategy used was to have a In the past (up to DVB API version 3), the strategy used was to have a
...@@ -41,25 +41,24 @@ with suppports all digital TV delivery systems. ...@@ -41,25 +41,24 @@ with suppports all digital TV delivery systems.
4. DVB API version 5 is also called *S2API*, as the first 4. DVB API version 5 is also called *S2API*, as the first
new standard added to it was DVB-S2. new standard added to it was DVB-S2.
Example: with the properties based approach, in order to set the tuner **Example**: in order to set the hardware to tune into a DVB-C channel
to a DVB-C channel at 651 kHz, modulated with 256-QAM, FEC 3/4 and at 651 kHz, modulated with 256-QAM, FEC 3/4 and symbol rate of 5.217
symbol rate of 5.217 Mbauds, those properties should be sent to Mbauds, those properties should be sent to
:ref:`FE_SET_PROPERTY <FE_GET_PROPERTY>` ioctl: :ref:`FE_SET_PROPERTY <FE_GET_PROPERTY>` ioctl:
- :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` = :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` = SYS_DVBC_ANNEX_A
SYS_DVBC_ANNEX_A
- :ref:`DTV_FREQUENCY <DTV-FREQUENCY>` = 651000000 :ref:`DTV_FREQUENCY <DTV-FREQUENCY>` = 651000000
- :ref:`DTV_MODULATION <DTV-MODULATION>` = QAM_256 :ref:`DTV_MODULATION <DTV-MODULATION>` = QAM_256
- :ref:`DTV_INVERSION <DTV-INVERSION>` = INVERSION_AUTO :ref:`DTV_INVERSION <DTV-INVERSION>` = INVERSION_AUTO
- :ref:`DTV_SYMBOL_RATE <DTV-SYMBOL-RATE>` = 5217000 :ref:`DTV_SYMBOL_RATE <DTV-SYMBOL-RATE>` = 5217000
- :ref:`DTV_INNER_FEC <DTV-INNER-FEC>` = FEC_3_4 :ref:`DTV_INNER_FEC <DTV-INNER-FEC>` = FEC_3_4
- :ref:`DTV_TUNE <DTV-TUNE>` :ref:`DTV_TUNE <DTV-TUNE>`
The code that would that would do the above is show in The code that would that would do the above is show in
:ref:`dtv-prop-example`. :ref:`dtv-prop-example`.
......
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