[media] dib8000: make a better estimation for dBm

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Use multiple linear segments to better interpolate the dBm
for the signal strength.

The table that converts from linear strength to dB was
empirically determinated with the help of a signal generator
(DTA-2111).

The entries from -35dBm to -22.5dBm were taken using just
the signal generator and the board.

For the entries from -36dBm to -51dBm, a 16 dB tap was used,
in order to extend its range.

Signals below to -51dBm are just linearly interpolated.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Acked-by: Patrick Boettcher <pboettcher@kernellabs.com>

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This commit is contained in:

Mauro Carvalho Chehab 2013-12-16 21:45:19 -03:00

parent b4600d70c0

commit 42ff76bdb0

1 changed files with 92 additions and 19 deletions

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drivers/media/dvb-frontends/dib8000.c

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