CXA2064 Ver la hoja de datos (PDF) - Sony Semiconductor
Número de pieza
componentes Descripción
Fabricante
CXA2064 Datasheet PDF : 21 Pages
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Description of Operation
The US audio multiplexing system possesses the base band spectrum shown in Fig. 2.
PEAK DEV
kHz
50
AM-DSB-SC
50
CXA2064M
L-R
dbx-TV
25
25
NR
L+R 5
50 – 15kHz
fH
SAP
dbx-TV NR
FM 10kHz
50 – 10kHz
2fH
3fH
4fH
5fH
Fig. 2. Base band spectrum
15
TELEMETRY
FM 3kHz
3
6fH 6.5fH f
fH = 15.734kHz
PLL
(VCO 8fH)
2fHL0°
fHL90°
fHL0°
PILOT DET
ST.ID
MODE CONTROL
(COMPIN) STEREO LPF
7
SAP BPF
PILOT
CANCEL
MAIN LPF DE.EM
(MAIN OUT)
(MAIN IN)
15
16
4.7µ
L+R
L-R (DSB)
DET
SAP(FM)
DET
INJ.
LOCK
SUB LPF
(SUBOUT)
2
10k
(STIN)
1
4.7µ
SAP LPF
(SAP OUT)
(SAP IN)
28
27
4.7µ
NR SW
A
NOISE
DET
dbx-TV
BLOCK
MATRIX (TVOUT-L)
23
B
(TVOUT-R)
22
MODE
CONTROL
SAP
DET
SAP.ID
MODE CONTROL
Fig. 3. Overall block diagram (See Fig. 4 for the dbx-TV block)
(ST IN)
1 NR SW
(SAP IN)
27
FIXED
A DEEMPHASIS
LPF
VARIABLE
DEEMPHASIS (VE OUT) (VCA IN)
HPF
25
24
4.7µ
RMS
DET
LPF
RMS
DET
VCA
B
to MATRIX
Fig 4. dbx-TV block
– 14 –
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