thomas schorpp wrote:
thomas schorpp wrote:
Marco Skambraks wrote:
hi,
any ideas?
marco
no.
and the other devs seem to be in holidays or have no more interest in
older FF cards.
ill do trial'n'error with the filter registers or implement
sysfs/procfs support in ves1820 for a trimmer GUI until I get access
to professional mesurement equipment.
ves1820 driver has DFE (decision feedback equalizer) set to off,
however web literature states this should be the better method than
just transversal.
ill try it.
and there more ideas from the stv driver code.
tom
DFE brings no qam256 relevevant improve, too:
static u8 ves1820_inittab[] = {
0x69, 0x6A, 0x93, 0x12, 0x12, 0x46, 0x27, 0x0A, // 06 46 //07 1A
0x43, 0x6A, 0xAA, 0xAA, 0x1E, 0x85, 0x43, 0x20,
0xE0, 0x00, 0xA1, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x32, 0x00, 0x00, 0x00, // 1C 00, 1E 00
0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x40
};
no more much software optimization left. the stv code's "software filter
regulation" cannot be easily adapted for now, too, the better DFE is
hard to configure without using hardware testmode and lab equipment, and
i dont believe in "matlab" simulations.
next trying to hardware chain missing ves1820 VAGC -> IF chip's extern
AGC input or bypass if chip completely (at cost of analogue tv support).
CD1516 tuner is also suspect to degradation, design mismatch and so
replacement with a more modern device.
