Sanyo AVM-2550S Training Manual page 64

PEAK DEV
kHz
AM-DSB-SC
50
L-R
dbx-TV
25 NR
25
L + R
5
50 – 15kHz
f 2f
H H
Fig.1. Base-band spectrum
(ST IN)
FIXED
VARIABLE
DEEMPHASIS
NR SW DEEMPHASIS (VE OUT) (VCA IN)
22
A
(SAP IN)
25
LPF
Fig.3. dbx-TV block
50
15
SAP
dbx-TV NR
TELEMETRY
FM 10kHz
FM 3kHz
50 – 10kHz
3f 4f 5f 6f
H H H H
f =15.734kHz
H
B
to
VCA
29 30
MATRIX
4.7µ
HPF
RMS
DET
LPF
RMS
DET
PLL
(VCO 8f
STEREO LPF
(COMPIN)
13
MVCA
SAP BPF
3
6.5f f
H
Fig.2. Overall block diagram (See Fig.3 for the dbx-TV block)
(AUX2-L) (AUX2-R)
37 36
(TVOUT-L) (TVOUT-R)
39
(AUX1-L)
34
TVSW
33
(AUX1-R)
(Lch) (Rch)
from MATRIX
– 61 –
2
I C BUS
DECODER
2f 0û
HL
PILOT
f 90û MODE
HL
)
H DET
f 0û CONTROL
HL
MAIN LPF DE.EM
(MAIN OUT)
PILOT
9
CANCEL
4.7µ
L + R
WIDEBAND
SUB LPF
(SUBOUT) (ST IN)
L-R (DSB)
21 22
SUBVCA
DET
4.7µ
L – R
SAP(FM)
DET
SAP LPF
(SAP OUT)
INJ.
24
LOCK
(SAP IN)
25
NOISE
2
I C BUS
4.7µ
DET
DECODER
2
I C BUS
SAP
DECODER
DET
MODE
CONTROL
(TOUT-L)
38
BASS TREBLE
SURROUND
(TOUT-R)
Fig.4. Sound processor block
(MAIN IN)
8
MATRIX
(Lch)
to
NR SW
A B
TVSW
(Rch)
dbx-TV
BLOCK
MODE
CONTROL
4.7µ
1 48
(VOLIN-L)
(LSOUT-L)
4
VOL-L
VOL-R
3
(LSOUT-R)
44 43
(VOLIN-R)
4.7µ