Technics RS-M226 - Dolby-B Encode Block Diagram; Dolby-C Encode Block Diagram; Dolby-B Decode Block Diagram; Dolby-C Decode Block Diagram

RS-M226
LINE OUT
METER &
HEADPHONES AMP
HEADPHONES
JACK
~~
Q8, 9
PEAK HOLD
SET/RESET
FL METER DRIVE
FL METER
YN)
—~___ $4
an | !
|
|
|
Ste)
LINE OUT
©
&
HEADPHONES
HEADPHONES
AMP
JACK
—vV,
Q8, 9
PEAKHOLD
SET/RESET
POWER
ONIOFF
~1. SWITCH
C200
RS-M226
DOLBY SYSTEM (L-CH ONLY)
Dolby-B
Encode
Refer
to
Item
©
“Dolby
NR
circuit”
of
the measurement and adjustment
AMP section to check the frequency
MIC IN Ic3 babahietes
NE654N response of the Dolby circuit in the
vRi Ics illustration.
NE652N
LINE IN (1) q
O O e RECORD
g
; MPX FILTER a i
NeTER SS
es l @
HEADPHONES (4) + > <2)
LINE OUT ar<d G)
N
ee
cE
all
@
Yl
BUFFER AMP <6 |
i (4)
3
G)
(6)
HIGH PASS FILTER
DOLBY NR CIRCUIT
FREQUENCY RESPONSE
Sy
ddNS YMd
©
Low level stage
integrating filter
Low level stage
high pass filter
TT)
i
>=
o—o—o-4
1kHz: +6dB+2.5dB
VR5
REC
EQ
AMP
5kHz:
+
8dB+2.5dB
=
Dolby-B Decode
IC3 1c5
NE654N
NE652N
METER
HEADPHONES
LINE OUT
IddNS YMd
Z|
~~ & HIGH PASS FILTER Low level stage
integrating filter
PB EQ AMP
Low level stage
high pass filter
rd
Refer to Item © “Dolby NR circuit” of
the measurement and adjustment
section to check the frequency
response of the Dolby circuit in the
illustration.
Dolby-C Encode
MIC IN MIC AMP.
IC3
NE654N
VR1
1c5
</
£
LINE
IN
0
NE652N
HIGH
LEVEL
STAGE
: -
MPX
FILTER
High
level
stage
ae
high
pass
filter
METER
HEADPHONES High level stage
integrating filter
LINE OUT High level stage
main chan signal
C—O 0
“Kr I<]
©) o—é @)
High level stage
side chain net work
Spectral
skewing
network
Low level stage
side chain net work
Low level stage
Low level stage
main chain signal
integrating filter
Anti-saturation filter
os Bs oe
ie
=
a
=o) ile
)——-©)-—®
Low level stage
i
high pass filter
Ma ta pe ig we ee le 4
LOW LEVEL stage”
DOLBY NR CIRCUIT FREQUENCY RESPONSE
kHz: +11.5dB+2.5dB $ # —
Dolby-C Decode
Ic3 1c5
HIGH LEVEL
NE654N NE652N STAGE
High level stage signal
High level stage
high pass filter
METER
High
level
stage
’
integrating
filer
HEADPHONE:
LINE
OUT
High level stage main
chain signal
TddNS YMd
XK
4sd0/0/8
High level stage
side chain network
Spectral
skewing
network
Low level stage side
chain network
Low level stage
integrating filter
Low level stage
high pass filter
Anti-Saturation filter
LOW LEVEL STAGE