Hitachi C28W440N, Service Manual

Page: 30 / 63

30
16.15.2.
PINNING
Pin1 : Output Stage Supply
Pin2 : Output
Pin3 : GND or Negative Supply
Pin4 : Flyback Supply
Pin5 :
Supply Voltage
Pin6 : Inverting Input
Pin7 : Non-inverting Input
16.16.
MSP34XX :
MSP3411D
Multistandard Sound Processor Family with Virtual Dolby Surround
1. Introduction
The MSP 34x1G family of single-chip Multistandard Sound Processors covers the sound
processing of all analog TV-Standards worldwide, as well as the NICAM digital sound
standards. The full TV sound processing, starting with analog sound IF signal-in, down to pro-
cessed analog AF-out, is performed on a single chip. Figure shows a simplified functional
block diagram of the MSP 34x1G. The MSP 34x1G has all functions of the MSP 34x0G
with the addition of a virtual surround sound feature. Surround sound can be reproduced to a
certain extent with two loudspeakers. The MSP 34x1G includes our virtualizer algorithm “3D-
PANORAMA” which has been approved by the Dolby
1)
Laboratories for compliance with the
"Virtual Dolby Surround" technology. In addition, the MSP 34x1G includes our “PANORAMA”
algo-rithm. These TV sound processing ICs include versions for processing the multichannel
television sound (MTS) signal conforming to the standard recommended by the Broadcast
Television Systems Committee (BTSC).
The DBX noise reduction, or alternatively, MICRONAS Noise Reduction (MNR) is performed
alignment free. Other processed standards are the Japanese FM-FM multiplex standard (EIA-
J) and the FM Stereo Radio standard.
Current ICs have to perform adjustment procedures in order to achieve good stereo
separation for BTSC and EIA-J. The MSP 34x1G has optimum stereo performance
without any adjustments. All MSP 34x1G versions are pin and software downward
compatible to the MSP 34x0D. The MSP 34x1G further simplifies controlling software.
Standard selection requires a single I
2
C transmission only. The MSP 34x1G has built-in
automatic functions: The IC is able to detect the actual sound standard automatically
(Automatic Standard Detection). Furthermore, pilot levels and identification signals can be
evaluated internally with subsequent switching between mono/ stereo/bilingual; no I
2
C
interaction is necessary (Automatic Sound Selection).