V4L/DVB (4681): Cx88: fix analog capture notch filter
authorLars Gjesse Kjellberg <lars.g.kjellberg@get2net.dk>
Tue, 26 Sep 2006 02:44:06 +0000 (23:44 -0300)
committerMauro Carvalho Chehab <mchehab@infradead.org>
Tue, 3 Oct 2006 18:14:33 +0000 (15:14 -0300)
commit4f43ac0cb228064cf6a253275ec1ecdab30c62f0
tree6fb9c5d524315aa0cf91ce22f38d7947dcd93ebe
parent76ac5dd6c055101ef9f8c6349cae4ef571039e93
V4L/DVB (4681): Cx88: fix analog capture notch filter

This patch changes the setting of the cx2388x notch filter to match that of
the video capture sample frequency, removing some annoying interference
lines THAT would appear when capturing composite video. This has been tested
in PAL and NTSC TV norms.
It sets the Y/C separation luma notch filter, which removes the chroma signal
from the luma signal when using a composite input.
The luma notch filter operates at the video decoder's frequency, not the ADC's
frequency or at the frequency of the scaled video. Y/C separation happens after
the sample rate converter, before video scaling.
The datasheet provides plots of the filter response for three _video decoder_
frequencies, 4x Fsc, square pixel, and ccir601.  These are the same three
frequencies for the notch filter control.  It seems pretty clear that this
filter should be set based on the video decoder frequency. The cx88 driver
always uses a video decoder frequency of 4xFsc.

Signed-off-by: Lars Gjesse Kjellberg <lars.g.kjellberg@get2net.dk>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
drivers/media/video/cx88/cx88-core.c