diff options
| author | Antti Palosaari | 2014-02-26 20:30:35 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2014-03-13 10:26:45 -0300 |
| commit | 8dfe644bf6c696b0f24d57f87fe25aea6cecb96a (patch) | |
| tree | 8ef83f5d4b749a736004c0d0cfbcc97473c476cd | |
| parent | 835b87c7adecef13bbc2a32c8e8437201144e9c4 (diff) | |
[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: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index 282f0a50433a..8c62ead889e4 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -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> |