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[media] doc-rst: improve documentation for DTV_FREQUENCY

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Make the note better formatted and documented.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-10 09:33:26 -03:00
parent 282f02cb86
commit 5632442d6c
1 changed files with 16 additions and 10 deletions
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26
Documentation/media/uapi/dvb/fe_property_parameters.rst
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@ -39,20 +39,26 @@ effect hardware.
DTV_FREQUENCY
=============
Central frequency of the channel.
Frequency of the digital TV transponder/channel.
Notes:
.. note::
1)For satellite delivery systems, it is measured in kHz. For the other
ones, it is measured in Hz.
#. For satellite delivery systems, the frequency is in kHz.
2)For ISDB-T, the channels are usually transmitted with an offset of
143kHz. E.g. a valid frequency could be 474143 kHz. The stepping is
bound to the bandwidth of the channel which is 6MHz.
#. For cable and terrestrial delivery systems, the frequency is in
Hz.
3)As in ISDB-Tsb the channel consists of only one or three segments the
frequency step is 429kHz, 3*429 respectively. As for ISDB-T the central
frequency of the channel is expected.
#. On most delivery systems, the frequency is the center frequency
of the transponder/channel. The exception is for ISDB-T, where
the main carrier has a 1/7 offset from the center.
#. For ISDB-T, the channels are usually transmitted with an offset of
about 143kHz. E.g. a valid frequency could be 474,143 kHz. The
stepping is bound to the bandwidth of the channel which is
typically 6MHz.
#. In ISDB-Tsb, the channel consists of only one or three segments the
frequency step is 429kHz, 3*429 respectively.
.. _DTV-MODULATION: