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All controller software workarounds used at former versions which write the KIs will no longer be needed and should
be removed (see also next section).
2.1.1.2. Comments to the Carrier Recovery in Connection with NICAM Audio Performance
The speed up of the carrier recovery to optimize the performance at non standard RF signals (caused by FM modu-
lation and modulator imbalance) is mainly based on a significant extension of the PLL-bandwith. However as a mat-
ter of principle any extension of the PLL bandwith increases the system noise sensitivity.
Since the NICAM audio system is basically highly sensitive to phase noise, the fast carrier recovery may reduce the
NICAM sensitivity, depending on the RF-signal condition. To avoid any reduction of the NICAM sound quality it is
recommended to switch off the carrier recovery speed up in case of NICAM reception setting the register
to 1 (see also section 2.1.1.4., WP5).
2.1.1.3. Status of VCT 49xyI-F1 and how to deal with currently used workarounds
The following table gives recommendations how to deal with workarounds used at C7/Dx:
No.
Problem
FP1 Streaky Noise
FP2 Modulator Imbal-
ance
FP3 FM Modulation
Flicker, Airplane
Flutter
RC: default AGC
setting too slow
CIRCUIT DESCRIPTIONS
Countries
Workaround
for C7 / Dx
Korea
T1-Coefficients for M/N
Speed up DRX video AGC:
- write VAGC_KI=5 every
20ms
- write TAGC_KI=2 every
20ms
Korea,
Adaptively
China,
(AFC_LOCK_QUAL):
Thailand,
- CR_AMP_TH 16 -> 64
Brazil
Vietnam
India,
Adaptively (NLPFLD):
Pakistan,
- CLMPST1 28 -> 45
Korea
- CLMPD1 11-> 3
- CR_P 3-> 4
Asia,
Speed up DRX video AGC:
France,
- write VAGC_KI=5 every
Czech
20ms
- write TAGC_KI=2 every
20ms
Side-Effect
Status in F1
Could not
significantly
solve prob-
improved
lem com-
pletely
Reduced
significantly
FM
improved
sound S/N
Could not
significantly
solve prob-
improved
lem com-
pletely
SW code
significantly
overhead
improved,
previously
adaptive
forced val-
functional-
ues now
ity not
default
usablex
PHAC_BP
Recommen-
dation for F1
remove WA
remove WA
remove WA
remove WA
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