cxa2064m Sony Electronics, cxa2064m Datasheet - Page 14

• Manufacturer Part Number: cxa2064m
• Description: Us Audio Multiplexing Decoder
• Manufacturer: Sony Electronics

Description of Operation
The US audio multiplexing system possesses the base band spectrum shown in Fig. 2.
(COMPIN) STEREO LPF
7
(SAP IN)
(ST IN)
27
PEAK DEV
1
SAP BPF
(VCO 8f
NR SW
kHz
PLL
50
25
H
)
L-R (DSB)
DET
50 – 15kHz
PILOT
CANCEL
SAP(FM)
DET
Fig. 3. Overall block diagram (See Fig. 4 for the dbx-TV block)
INJ.
LOCK
L + R
A
2f
f
f
HL
HL
FIXED
DEEMPHASIS
HL
90°
0°
0°
SAP LPF
LPF
25
MAIN LPF DE.EM
5
SUB LPF
f
H
PILOT DET
AM-DSB-SC
(SUBOUT)
(SAP OUT)
NOISE
DET
SAP
DET
10k
28
VARIABLE
DEEMPHASIS (VE OUT)
2f
Fig. 2. Base band spectrum
2
H
dbx-TV
HPF
LPF
Fig 4. dbx-TV block
L-R
NR
4.7µ
(MAIN OUT)
SAP.ID
MODE CONTROL
MODE CONTROL
ST.ID
4.7µ
L + R
15
(SAP IN)
50
3f
27
– 14 –
H
(STIN)
1
4.7µ
RMS
DET
RMS
DET
25
(MAIN IN)
4.7µ
4f
16
NR SW
H
(VCA IN)
24
A
dbx-TV NR
50 – 10kHz
FM 10kHz
SAP
5f
VCA
dbx-TV
BLOCK
H
B
15
B
6f
to MATRIX
MODE
CONTROL
f
TELEMETRY
H
H
MATRIX
= 15.734kHz
FM 3kHz
6.5f
H
(TVOUT-R)
(TVOUT-L)
23
22
3
f
CXA2064M