Fig.1 Block diagram of the bipolar TV/VTR-stereo decoder.

Input and output levels are nominal values related to the SCART norm (AM: m = 0.54, FM:

∆f= ±27 kHz).

6 dB

0 dB

3 dB

3 dB

3 dB

6 dB (AM)

6 dB

6 dB

6 dB

RMS

250 mV

250 mV

Vref

Vref

Vref

Vref

Vref

Vref

RMS

R/B

250 mV RMS

L/A/mono

AM

50 k

Ω

50 k

Ω

15 k

Ω

2.2 k

Ω

35 k

Ω

2.2 k

Ω

50 k

Ω

10 k

Ω

10 k

Ω

5 k

Ω

5 k

Ω

30 k

Ω

25 k

Ω

25 k

Ω

1 k

Ω

A/mono

500 mV RMS

500 mV RMS

500 mV RMS

500 mV RMS

CONTROL

LOGIC

POWER-ON

RESET

SUPPLY

DIGITAL

INTEGRATOR

DIGITAL

INTEGRATOR

DIGITAL PLL

AND

DEMODULATOR

DIGITAL PLL

AND

DEMODULATOR

DIGITAL

PLL

OSCILLATOR

2.2

µF

10

µF

2.2

µF

2.2

µF

100

µF/

16 V

2.2

µF

L + R

2

, A

250 mV RMS

(AM: 500 mV RMS)

Vi2

Vi1

RFP

R, B

250 mV RMS

47 pF

CFP

3.3 nF

10 nF

tan

δ ≤ 0.002

CDCL

Qo= 70

CAGC

CLP

Vref

VP

VP

Cref

10 MHz

(117 Hz)

(274 Hz)

stereo

bit

dual bit

stereo transmission

dual transmission

Vo4

Vi4 Vi3

Vo3

Vo2

Vo1

CD1

CD2

main

0 dB

L

10 nF

±5%

10 nF

±5%

250 mV

RMS

250 mV RMS

SCART

100 nF

17

21

12

11

14

13

16

15

19

18

1

2

24

20

22

23

8

3

C1

C2

C3

C4

5

4

6

7

10

9

TDA9847

mute

MED803

1/2 VP

SCART

2.5 mH