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| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-10 14:48:58 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-10 14:50:07 +0200 |
| commit | fed7b888f69f70fc35c184677b2e8f59cb3945cb (patch) | |
| tree | 76958e42f92c68788b1f0ce5f4037f5da29b4e9f /Documentation | |
| parent | [media] doc-rst: improve documentation for DTV_FREQUENCY (diff) | |
| download | linux-fed7b888f69f70fc35c184677b2e8f59cb3945cb.tar.xz linux-fed7b888f69f70fc35c184677b2e8f59cb3945cb.zip | |
[media] doc-rst: improve DTV_BANDWIDTH_HZ notes
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outdated, so take some care of it, making it updated.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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/media/uapi/dvb/fe_property_parameters.rst | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/Documentation/media/uapi/dvb/fe_property_parameters.rst b/Documentation/media/uapi/dvb/fe_property_parameters.rst index 1b0b1171602d..f776d62523da 100644 --- a/Documentation/media/uapi/dvb/fe_property_parameters.rst +++ b/Documentation/media/uapi/dvb/fe_property_parameters.rst @@ -219,23 +219,29 @@ Bandwidth for the channel, in HZ. Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``, ``8000000``, ``10000000``. -Notes: +.. note:: + + #. DVB-T supports 6, 7 and 8MHz. + + #. DVB-T2 supports 1.172, 5, 6, 7, 8 and 10MHz. -1) For ISDB-T it should be always 6000000Hz (6MHz) + #. ISDB-T supports 5MHz, 6MHz, 7MHz and 8MHz, although most + places use 6MHz. -2) For ISDB-Tsb it can vary depending on the number of connected -segments + #. 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`. -3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth for -DVB-C depends on the symbol rate + #. 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. -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). + #. For DVB-S2, the bandwidth estimation will use :ref:`DTV-ROLLOFF`. -5) DVB-T supports 6, 7 and 8MHz. + #. For ISDB-Tsb, it can vary depending on the number of connected + segments. -6) In addition, DVB-T2 supports 1.172, 5 and 10MHz. + #. Bandwidth in ISDB-Tsb can be easily derived from other parameters + (DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT). .. _DTV-INVERSION: |