Commit 8dfe644b authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab

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

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

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 835b87c7
...@@ -5013,8 +5013,27 @@ defines possible values for de-emphasis. Here they are:</entry> ...@@ -5013,8 +5013,27 @@ defines possible values for de-emphasis. Here they are:</entry>
<section id="rf-tuner-controls"> <section id="rf-tuner-controls">
<title>RF Tuner Control Reference</title> <title>RF Tuner Control Reference</title>
<para>The RF Tuner (RF_TUNER) class includes controls for common features <para>
of devices having RF tuner.</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"> <table pgwide="1" frame="none" id="rf-tuner-control-id">
<title>RF_TUNER Control IDs</title> <title>RF_TUNER Control IDs</title>
......
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