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4f43ac0cb2
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> |
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| .. | ||
| cx88-alsa.c | ||
| cx88-blackbird.c | ||
| cx88-cards.c | ||
| cx88-core.c | ||
| cx88-dvb.c | ||
| cx88-i2c.c | ||
| cx88-input.c | ||
| cx88-mpeg.c | ||
| cx88-reg.h | ||
| cx88-tvaudio.c | ||
| cx88-vbi.c | ||
| cx88-video.c | ||
| cx88-vp3054-i2c.c | ||
| cx88-vp3054-i2c.h | ||
| cx88.h | ||
| Kconfig | ||
| Makefile | ||