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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-10 09:33:26 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-10 09:33:26 -0300 |
commit | 5632442d6cc87024c69467df5621db33a55a2091 (patch) | |
tree | 68ad3ae6956d85fce317457d9da86d99578158ee /Documentation/media | |
parent | 282f02cb863594d9f39b7b89a92eeb7fc989a883 (diff) | |
download | linux-5632442d6cc87024c69467df5621db33a55a2091.tar.gz linux-5632442d6cc87024c69467df5621db33a55a2091.tar.bz2 linux-5632442d6cc87024c69467df5621db33a55a2091.zip |
[media] doc-rst: improve documentation for DTV_FREQUENCY
Make the note better formatted and documented.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media')
-rw-r--r-- | Documentation/media/uapi/dvb/fe_property_parameters.rst | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/Documentation/media/uapi/dvb/fe_property_parameters.rst b/Documentation/media/uapi/dvb/fe_property_parameters.rst index 47eb29350717..1b0b1171602d 100644 --- a/Documentation/media/uapi/dvb/fe_property_parameters.rst +++ b/Documentation/media/uapi/dvb/fe_property_parameters.rst @@ -39,20 +39,26 @@ effect hardware. DTV_FREQUENCY ============= -Central frequency of the channel. +Frequency of the digital TV transponder/channel. -Notes: +.. note:: + + #. For satellite delivery systems, the frequency is in kHz. + + #. For cable and terrestrial delivery systems, the frequency is in + Hz. -1)For satellite delivery systems, it is measured in kHz. For the other -ones, it is measured in Hz. + #. 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. -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 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. -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. + #. In ISDB-Tsb, the channel consists of only one or three segments the + frequency step is 429kHz, 3*429 respectively. .. _DTV-MODULATION: |