Circuit Description - Sharp OPTONICA APSS RT-1616H Service Manual

each input signal, it is normal.
V.T.V.M. reads
CR Oscillator
lOOHz, t kHz, 10 kHz, 12.5 kz
Figure 13—1
CIRCUIT DESCRIPTION
DOLBY NOISE REDUCTION SYSTEM
The construction of Dolby
NR circuit is as shown
below.
(e) DOLBY &—TYPE INTEGRATEO CIRCUIT
SIGNETICS NESacH
[REC OUT] OUT
ray] [one
2 ID Fl 12 13 14 1S 06
Pravi = gFeconp 4g OUT
BW Ie1, 5456, 9050
mone YSHi-s 7 HOISE
AEOUCTION
Figure 14—1
Dolby Side Chain
Input-Output
Characteristic
Frequency: 5kHz
Dolby Side Chain Circuit
of the limiter.
they are operating.
Input ——_———~—
Figure 14—2
TURNOVER FREQUENCY
ABOUT 8 kHz
Figure 14—3