Hi, > Many analog tuners are used by ATSC decoders too. The FCC > allocates the same channel frequency and bandwidth to both > services so the same tuner can be used for either one. > These tuners have their own i2c address. They are not a > part of the decoder chip. > That's similar with DVB-T They use the same frequencies and bandwidths. The classic PLLs even have a similar programming model but: - IF frequency is different - Tuning is controlled more carefully. The bands are divided in subbands with different setups for the charge current and something else i don't know. The simple scheme VHF low, VHF high and UHF no longer is sufficient. - RF AGC setup is different. - Many of the current tuners are hybrid versions. They reqire switching between analog and digital mode. > Currently these tuners have separate code in video4linux CVS > and dvb CVS that does exactly the same thing. The code in > video4linux CVS is configured by tables and supports a > large number of the analog tuners. It would be nice if the > code in video4linux was shared instead of having to > maintain code that does the same thing in dvb CVS for > tuners that are used by both analog TV and ATSC. > So for ATSC this might be possible, but for DVB-T bigger changes are necessary to get i.e the modes and the subbands implemented. I am in doubt that this is a good idea. Hartmut
