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Datasheet: 1892 (NEC)

MATRIX SURROUND SOUND PROCESSOR WITH SOUND PROCESSOR

 

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NEC

Document Outline

The
PC1892 is a specific IC to reproduce surround sound by using phase shifters and a signal matrix.
The
PC1892 provides wide sound with two speakers, and rich stereophonic sound with three speakers.
In case of stereo signal, the
PC1892 has the movie mode to reproduce sense of immediacy (for movie) and the music mode
to emphasize vocal sound (for music), and it has the simulated mode to make monaural signal into wide deep sound. The modes
can be selected freely by using 2-bit parallel control pins.
In addition to this function reproducing surround sound, the
PC1892 has a general sound processor that has volume, balance,
bass and treble control. So it is capable of reducing installation area.
All functions for processing signals of base band sound are provided on one chip.
FEATURES
Three surround modes are available: movie, music and simulated
Built in volume and balance control (All control voltage: 0 V to 5 V)
Built in tone control (bass, treble) (All control voltage: 0 V to 5 V)
Built in L+R output for woofer SP
PC1892CT-02: The volume and balance attenuation are bigger than
PC1892CT.
APPLICATION
TV
ORDERING INFORMATION
Part Number
Package
PC1892CT
30-pin plastic shrink DIP (400 mil)
PC1892CT-02
30-pin plastic shrink DIP (400 mil)
1991, 1992, 1995
DATA SHEET
MATRIX SURROUND SOUND PROCESSOR
WITH SOUND PROCESSOR
PC1892
Bipolar Analog Integrated Circuit
Document No. S10650EJ3V0DS00 (3rd edition)
(Previous No. ID-2902)
Date Published October 1995 P
Printed in Japan
The information in this document is subject to change without notice.
PC1892
2
SYSTEM BLOCK DIAGRAM (TV)
Digital tuning
controller
PD17002
PD17052
PD17053
PC1852
L
R
PC2800A
PC2801A
Tuner
PIF&SIF
Color
output
CRT
Vertical
output
Color, intensity
and defrecting
signal processor
Remote
control
reception
amplifier
PIN photo diode
Matrix surround
sound processor
US MTS
PC1310
PC1892
PC1316C
Power amplifier
CRT
PC1892
3
BLOCK DIAGRAM
HPF
28
29
2
3
4
5
30
22
21
1
20
19
18
14
9
12
26
25
13
16
DC CONTROL
17
15
11
10
23
8
7
27
24
MATRIX
EFFECT
CONTROL
Surround
OFFSET
ABSORPTION
VOLUME
BALANCE
CONTROL
VOLUME
BALANCE
CONTROL
VOLUME
CONTROL
TONE
(BASS, TREBLE)
CONTROL
TONE
(BASS, TREBLE)
CONTROL
6
820 k
2200 pF
FC1
FC2
FC3
FC4
0.022 F
0.1 F
0.082 F
1 F
+
0.15 F
V
CC
+5 V
510
510
10 k
L OUTPUT
L+ (LR)
VOLUME
CONTROL
BALANCE
CONTROL
L + R
VOLUME
CONTROL
10 k
510
10 k
+
4.7 F
R OUTPUT
R (LR)
+
4.7 F
L+R OUTPUT
L+R
+
4.7 F
REAR OUTPUT
(LR)
(LR)
+
4.7 F
6800 pF
0.022 F 1000 pF
Note
Note
GND
+5 V
510
510
10 k
TREBLE
CONTROL
BASS
CONTROL
10 k
0.15 F
6800 pF
+5 V
MS2
MS1
510
EFFECT
CONTROL
10 k
1 k
Music
OFF
LR
Movie/
Music
Simulated

+

+
Simulated/Movie
PS1
LPF
1
PS2 PS3 PS4
LPF
2
PHASE SHIFTER
1 k
V
CC
R
IN
MODE
CONTROL
+
680 pF
22 F
1
2
+
22 F
22 F
L
IN
+
Note
Note
V
CC
1
2
Note Recommended Precision:
1 %
PC1892
4
PIN CONFIGURATIONS (Top View)
30
Low Pass Filter2
PC1892CT
PC1892CT-02
LF2
29
Monaural Filter Input
MFI
28
Monaural Filter Output
MFO
27
Low Pass Filter1
LF1
26
R-ch Signal Input
R
IN
25
L-ch Signal Input
L
IN
24
Reference Voltage
RF
23
Effect Control
EFF
22
L-ch Treble Capacitor
LTC
21
L-ch Bass Capacitor
LBC
20
Balance Control
BAL
19
Volume Control
VOL
18
L+R-ch Volume Control
L + R
17
Bass Control
BAS
16
Treble Control
TBL
1
V
CC
Supply Voltage
2
FC1
Phase Shift Filter1
3
FC2
Phase Shift Filter2
4
FC3
Phase Shift Filter3
5
FC4
Phase Shift Filter4
6
OF
Offset Filter
7
MS1
Mode Select1
8
MS2
Mode Select2
9
REARout
Rear Output
10
RTC
R-ch Treble Capacitor
11
RBC
R-ch Bass Capacitor
12
Rout
R-ch Signal Output
13
L + Rout
L+R-ch Signal Output
14
Lout
L-ch Signal Output
15
GND
Ground
PC1892
5
MODE SELECT CODE
Select among OFF, Movie, Music and Simulated mode by MS1 and MS2 (Pins 7 and 8).
Code
MS1
MS2
Mode
(Pin 7)
(Pin 8)
OFF
L
L
Music
H
L
Movie
L
H
Simulated
H
H
Cautions 1. In the case of changing surround mode and power ON/OFF, mute (approx. 200 ms) must be used for pop
noise reduction.
2. Insert resistors between mode select pins (pin 7, 8) and GND, between control pins (pin 16, 17, 18, 19, 20,
23) and GND.
3. Connect a electrolytic capacitor for power supply as close as possible to V
CC
(pin 1).
Remark
About "H" and "L", refer to RECOMMENDED OPERATING CONDITIONS.
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