Philips CEM5000/00, Service Manual

Page: 79 / 83

TDA7703/TDA7703R
9.1.4 High cut control
(continuous set)
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
HCFSsp Start point vs. field strength
minimum RF level for widest
HC filter (filter # 7)
no multipath present
0 50 50 dBu
HCFSep End point vs. field strength
maximum RF level for
narrowest HC filter (filter # 0)
no multipath present
0 30 40 dBu
HCFStW2N
Field strength-related
transition time from wide to
narrow band
Vrf step-like variation from 60
dBu to 10 dBu
(1)
-
HCFStN2W
Field strength-related
transition time from narrow to
wide band
Vrf step-like variation from 0
dBu to 60 dBu
(1)
14 100 s
HCMPsp Start point vs. multipath
minimum RF level for widest
HC filter (filter # 7)
equivalent 19 kHz AM
modulation depth;
field strength = 80 dBu
5 10 150
(2)
%
HCMPep End point vs. multipath
maximum RF level for
narrowest HC filter (filter # 0)
equivalent 19 kHz AM
modulation depth;
field strength = 80 dBu
5 30 150
(2)
%
HCMPtN2W
multipath -related transition
time from narrow to wide
band
Vrf step-like variation from 20
dBu to 80 dBu
0.001 0.001 20 s
HCMPtW2N
multipath -related transition
time from wide to narrow Vrf step-like variation from 80
dBu to 20 dBu
0.001 0.001 20 s
HCmaxBW
Maximum cut-off frequency of
high cut filter bank
Filter #7, -3 dB response
frequency, input signal with
pre-emphasis
HCmin
BW
14 18 kHz
HCminBW
Minimum cut-off frequency of
high cut filter bank
Filter #0, -3 dB response
frequency, input signal with
pre-emphasis
0.1 3
HCma
xBW
kHz
HCnumFilt Number of discrete HC filters - - 8
(3)
- -
(1): depends only on field strength filter time constant
(2): means that 100% equivalent 19 kHz AM modulation depth will not achieve full band narrowing
(3): intermediate filters (#6 - #1) cut-off frequencies exponentially spaced between HCmaxBW and HCminBW
9.1.6 De-emphasis filter
(discrete set)
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
De-emphasis time constant 1 - - 50 - us
DEtc
De-emphasis time constant 2 - - 75 - us
9.1.7 Stereo decoder
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
PilSup Pilot signal suppression Pilot 9%, 19Khz, ref=40Khz - 60 - dB
F = 38 Khz - 70 - dB
F = 57 Khz - 70 - dB SubcSup Subcarrier suppression
F = 76 Khz - 80 - dB
Rev. 1.0 18/22