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[media] DocBook: media: add some general info about RF tuners

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Add some info what is RF tuner in context of V4L RF tuner class.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2014-02-26 20:30:35 -03:00 committed by Mauro Carvalho Chehab
parent 835b87c7ad
commit 8dfe644bf6
1 changed files with 21 additions and 2 deletions
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23
Documentation/DocBook/media/v4l/controls.xml
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@ -5013,8 +5013,27 @@ defines possible values for de-emphasis. Here they are:</entry>
<section id="rf-tuner-controls">
<title>RF Tuner Control Reference</title>
<para>The RF Tuner (RF_TUNER) class includes controls for common features
of devices having RF tuner.</para>
<para>
The RF Tuner (RF_TUNER) class includes controls for common features of devices
having RF tuner.
</para>
<para>
In this context, RF tuner is radio receiver circuit between antenna and
demodulator. It receives radio frequency (RF) from the antenna and converts that
received signal to lower intermediate frequency (IF) or baseband frequency (BB).
Tuners that could do baseband output are often called Zero-IF tuners. Older
tuners were typically simple PLL tuners inside a metal box, whilst newer ones
are highly integrated chips without a metal box "silicon tuners". These controls
are mostly applicable for new feature rich silicon tuners, just because older
tuners does not have much adjustable features.
</para>
<para>
For more information about RF tuners see
<ulink url="http://en.wikipedia.org/wiki/Tuner_%28radio%29">Tuner (radio)</ulink>
and
<ulink url="http://en.wikipedia.org/wiki/RF_front_end">RF front end</ulink>
from Wikipedia.
</para>
<table pgwide="1" frame="none" id="rf-tuner-control-id">
<title>RF_TUNER Control IDs</title>