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| author | David Howells <dhowells@redhat.com> | 2015-04-09 16:36:49 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-05-14 18:29:48 -0300 |
| commit | 4c12adad26f059fa207d6b07aa61f39bc459211b (patch) | |
| tree | f903c40f998af698447faa89ff3a39b6da50d7e0 /Documentation | |
| parent | 24d795d361b2cd5cb6a6915ad4df61db7a2a9bef (diff) | |
| download | op-kernel-dev-4c12adad26f059fa207d6b07aa61f39bc459211b.zip op-kernel-dev-4c12adad26f059fa207d6b07aa61f39bc459211b.tar.gz | |
[media] dvb: Document FE_SCALE_DECIBEL units consistently
In comments and in the documentation, the units of properties marked
with the FE_SCALE_DECIBEL scale are specified in terms of 1/1000 dB
or 0.0001 dB. This is inconsistent, however, as 1/1000 is 0.001,
not 0.0001.
Note that the v4l-utils divide the value by 1000 for the signal
strength suggesting that the 1/1000 is correct.
Settle on millidecibels, ie. 1/1000dB or 0.001dB.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/media/dvb/dvbproperty.xml | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/dvb/dvbproperty.xml b/Documentation/DocBook/media/dvb/dvbproperty.xml index 3018564..7ddab2b 100644 --- a/Documentation/DocBook/media/dvb/dvbproperty.xml +++ b/Documentation/DocBook/media/dvb/dvbproperty.xml @@ -953,7 +953,7 @@ enum fe_interleaving { <para>Possible scales for this metric are:</para> <itemizedlist mark='bullet'> <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> - <listitem><para><constant>FE_SCALE_DECIBEL</constant> - signal strength is in 0.0001 dBm units, power measured in miliwatts. This value is generally negative.</para></listitem> + <listitem><para><constant>FE_SCALE_DECIBEL</constant> - signal strength is in 0.001 dBm units, power measured in miliwatts. This value is generally negative.</para></listitem> <listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for power (actually, 0 to 65535).</para></listitem> </itemizedlist> </section> @@ -963,7 +963,7 @@ enum fe_interleaving { <para>Possible scales for this metric are:</para> <itemizedlist mark='bullet'> <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> - <listitem><para><constant>FE_SCALE_DECIBEL</constant> - Signal/Noise ratio is in 0.0001 dB units.</para></listitem> + <listitem><para><constant>FE_SCALE_DECIBEL</constant> - Signal/Noise ratio is in 0.001 dB units.</para></listitem> <listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for Signal/Noise (actually, 0 to 65535).</para></listitem> </itemizedlist> </section> |
