Akai PDP5006H, Руководство по обслуживанию

Страница: 51 / 94

PRELIMINARY DATA SHEET
MSP 34x0G
Micronas
Multistandard Sound Processor Family
Release Note: Revision bars indicate significant
changes to the previous edition. The hardware and
software description in this document is valid for
the MSP 34x0G version B8 and following versions.
1. Introduction
The MSP 34x0G 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 1
– 1 shows a simplified functional block diagram
of the MSP 34x0G.
This new generation of TV sound processing ICs now
includes versions for processing the multichannel tele-
vision sound (MTS) signal conforming to the standard
recommended by the Broadcast Television Systems
Committee (BTSC). The DBX noise reduction, or alter-
natively, Micronas Noise Reduction (MNR) is per-
formed 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 34x0G has optimum stereo perfor-
mance without any adjustments.
All MSP 34xxG versions are pin compatible to the
MSP 34xxD. Only minor modifications are necessary
to adapt a MSP 34xxD controlling software to the
MSP 34xxG. The MSP 34x0G further simplifies con-
trolling software. Standard selection requires a single
I
2
C transmission only.
The MSP 34x0G has built-in automatic functions: The
IC is able to detect the actual sound standard automat-
ically (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 (Auto-
matic Sound Selection).
The MSP 34x0G can handle very high FM deviations
even in conjunction with NICAM processing. This is
especially important for the introduction of NICAM in
China.
The ICs are produced in submicron CMOS technology.
The MSP 34x0G is available in the following packages:
PLCC68 (not intended for new design), PSDIP64,
PSDIP52, PQFP80, and PLQFP64.
Fig. 1–1: Simplified functional block diagram of the MSP 34x0G
So
ur
c
e
Se
le
ct
Loud-
SCART1
SCART2
SCART1
SCART2
SCART4
SCART3
MONO
De-
modulator
Headphone
Headphone
I
2
S
Sound
Processing
speaker
Sound
Processing
DAC
DAC
ADC
Loud-
DAC
DAC
ADC
Subwoofer
SCART
DSP
Input
Select
Pre-
processing
SCART
Output
Select
Prescale
Prescale
I
2
S1
I
2
S2
Sound IF1
Sound IF2
speaker