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[media] doc-rst: improve DTV_BANDWIDTH_HZ notes

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There are several notes for this DTV property. Some are
outdated, so take some care of it, making it updated.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-10 09:48:58 -03:00
parent 5632442d6c
commit fed7b888f6
1 changed files with 17 additions and 11 deletions
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28
Documentation/media/uapi/dvb/fe_property_parameters.rst
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@ -219,23 +219,29 @@ Bandwidth for the channel, in HZ.
Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``,
``8000000``, ``10000000``.
Notes:
.. note::
1) For ISDB-T it should be always 6000000Hz (6MHz)
#. DVB-T supports 6, 7 and 8MHz.
2) For ISDB-Tsb it can vary depending on the number of connected
segments
#. DVB-T2 supports 1.172, 5, 6, 7, 8 and 10MHz.
3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth for
DVB-C depends on the symbol rate
#. ISDB-T supports 5MHz, 6MHz, 7MHz and 8MHz, although most
places use 6MHz.
4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
DTV_ISDBT_SB_SEGMENT_COUNT).
#. On DVB-C and DVB-S/S2, the bandwidth depends on the symbol rate.
So, the Kernel will silently ignore setting :ref:`DTV-BANDWIDTH-HZ`.
5) DVB-T supports 6, 7 and 8MHz.
#. For DVB-C and DVB-S/S2, the Kernel will return an estimation of the
bandwidth, calculated from :ref:`DTV-SYMBOL-RATE` and from
the rolloff, with is fixed for DVB-C and DVB-S.
6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.
#. For DVB-S2, the bandwidth estimation will use :ref:`DTV-ROLLOFF`.
#. For ISDB-Tsb, it can vary depending on the number of connected
segments.
#. Bandwidth in ISDB-Tsb can be easily derived from other parameters
(DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT).
.. _DTV-INVERSION: