1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2
3 .. _rf-tuner-controls:
4
5 **************************
6 RF Tuner Control Reference
7 **************************
8
9 The RF Tuner (RF_TUNER) class includes control
10 devices having RF tuner.
11
12 In this context, RF tuner is radio receiver ci
13 demodulator. It receives radio frequency (RF)
14 converts that received signal to lower interme
15 baseband frequency (BB). Tuners that could do
16 called Zero-IF tuners. Older tuners were typic
17 inside a metal box, while newer ones are highl
18 without a metal box "silicon tuners". These co
19 applicable for new feature rich silicon tuners
20 tuners does not have much adjustable features.
21
22 For more information about RF tuners see
23 `Tuner (radio) <http://en.wikipedia.org/wiki/T
24 and `RF front end <http://en.wikipedia.org/wik
25 from Wikipedia.
26
27
28 .. _rf-tuner-control-id:
29
30 RF_TUNER Control IDs
31 ====================
32
33 ``V4L2_CID_RF_TUNER_CLASS (class)``
34 The RF_TUNER class descriptor. Calling
35 :ref:`VIDIOC_QUERYCTRL` for this control w
36 return a description of this control class
37
38 ``V4L2_CID_RF_TUNER_BANDWIDTH_AUTO (boolean)``
39 Enables/disables tuner radio channel bandw
40 automatic mode bandwidth configuration is
41
42 ``V4L2_CID_RF_TUNER_BANDWIDTH (integer)``
43 Filter(s) on tuner signal path are used to
44 to receiving party needs. Driver configure
45 desired bandwidth requirement. Used when
46 V4L2_CID_RF_TUNER_BANDWIDTH_AUTO is not se
47 range and step are driver-specific.
48
49 ``V4L2_CID_RF_TUNER_LNA_GAIN_AUTO (boolean)``
50 Enables/disables LNA automatic gain contro
51
52 ``V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO (boolean)`
53 Enables/disables mixer automatic gain cont
54
55 ``V4L2_CID_RF_TUNER_IF_GAIN_AUTO (boolean)``
56 Enables/disables IF automatic gain control
57
58 ``V4L2_CID_RF_TUNER_RF_GAIN (integer)``
59 The RF amplifier is the very first amplifi
60 path, just right after the antenna input.
61 LNA gain and the RF gain in this document
62 integrated in the tuner chip while the RF
63 There may be both RF and LNA gain controls
64 range and step are driver-specific.
65
66 ``V4L2_CID_RF_TUNER_LNA_GAIN (integer)``
67 LNA (low noise amplifier) gain is first ga
68 signal path. It is located very close to t
69 when ``V4L2_CID_RF_TUNER_LNA_GAIN_AUTO`` i
70 ``V4L2_CID_RF_TUNER_RF_GAIN`` to understan
71 differs from the each others. The range an
72 driver-specific.
73
74 ``V4L2_CID_RF_TUNER_MIXER_GAIN (integer)``
75 Mixer gain is second gain stage on the RF
76 located inside mixer block, where RF signa
77 mixer. Used when ``V4L2_CID_RF_TUNER_MIXER
78 The range and step are driver-specific.
79
80 ``V4L2_CID_RF_TUNER_IF_GAIN (integer)``
81 IF gain is last gain stage on the RF tuner
82 located on output of RF tuner. It controls
83 intermediate frequency output or baseband
84 ``V4L2_CID_RF_TUNER_IF_GAIN_AUTO`` is not
85 are driver-specific.
86
87 ``V4L2_CID_RF_TUNER_PLL_LOCK (boolean)``
88 Is synthesizer PLL locked? RF tuner is rec
89 when that control is set. This is a read-o
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.