==============
Specifies the frontend modulation type for delivery systems that
-supports more multiple modulations.
+support multiple modulations.
The modulation can be one of the types defined by enum :c:type:`fe_modulation`.
-Most of the digital TV standards offers more than one possible
+Most of the digital TV standards offer more than one possible
modulation type.
The table below presents a summary of the types of modulation types
(DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT).
#. On Satellite and Cable delivery systems, the bandwidth depends on
- the symbol rate. So, the Kernel will silently ignore any setting
- :ref:`DTV-BANDWIDTH-HZ`. I will however fill it back with a
- bandwidth estimation.
+ the symbol rate. The kernel will silently ignore any :ref:`DTV-BANDWIDTH-HZ`
+ setting and overwrites it with bandwidth estimation.
Such bandwidth estimation takes into account the symbol rate set with
:ref:`DTV-SYMBOL-RATE`, and the rolloff factor, with is fixed for
Used on satellite delivery systems.
The voltage is usually used with non-DiSEqC capable LNBs to switch the
-polarzation (horizontal/vertical). When using DiSEqC epuipment this
+polarization (horizontal/vertical). When using DiSEqC equipment this
voltage has to be switched consistently to the DiSEqC commands as
described in the DiSEqC spec.
Used only on ISDB.
-If ``DTV_ISDBT_SOUND_BROADCASTING`` is '0' this bit-field represents
+If ``DTV_ISDBT_SOUND_BROADCASTING`` is '0' this bit field represents
whether the channel is in partial reception mode or not.
If '1' ``DTV_ISDBT_LAYERA_*`` values are assigned to the center segment
Assuming a normal 13-segment ISDB-T spectrum he can align the 8 segments
from position 1-8 to 5-13 or anything in between.
-The underlying layer of segments are subchannels: each segment is
-consisting of several subchannels with a predefined IDs. A sub-channel
+The underlying layer of segments are sub-channels: each segment is
+consisting of several sub-channels with a predefined IDs. A sub-channel
is used to help the demodulator to synchronize on the channel.
An ISDB-T channel is always centered over all sub-channels. As for the
Used only on ATSC-MH.
-Reed Solomon(RS) frame ensemble.
+Reed Solomon (RS) frame ensemble.
The acceptable values are defined by :c:type:`atscmh_rs_frame_ensemble`.
A Multi standard frontend needs to advertise the delivery systems
provided. Applications need to enumerate the provided delivery systems,
-before using any other operation with the frontend. Prior to it's
+before using any other operation with the frontend. Prior to its
introduction, FE_GET_INFO was used to determine a frontend type. A
frontend which provides more than a single delivery system,
FE_GET_INFO doesn't help much. Applications which intends to use a
multistandard frontend must enumerate the delivery systems associated
with it, rather than trying to use FE_GET_INFO. In the case of a
legacy frontend, the result is just the same as with FE_GET_INFO, but
-in a more structured format
+in a more structured format.
The acceptable values are defined by :c:type:`fe_delivery_system`.
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
-.. _dvb_introdution:
+.. _dvb_introduction:
************
Introduction
control the MPEG2 decoder hardware, the frontend device the tuner and
the Digital TV demodulator. The demux device gives you control over the PES
and section filters of the hardware. If the hardware does not support
-filtering these filters can be implemented in software. Finally, the CA
+filtering, these filters can be implemented in software. Finally, the CA
device controls all the conditional access capabilities of the hardware.
It can depend on the individual security requirements of the platform,
if and how many of the CA functions are made available to the
projects / thirdparty / kernel / stable.git / commitdiff
