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PDF MSP3410B Data sheet ( Hoja de datos )
| Número de pieza | MSP3410B | |
| Descripción | Multistandard Sound Processors | |
| Fabricantes | Micronas | |
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PRELIMINARY DATA SHEET
MSP 3410 B
Multistandard
Sound Processor
Edition Nov. 20, 1995
6251-366-9PD
1 page  
PRELIMINARY DATA SHEET
MSP 3410 B
2. Features of the MSP 3410 B
2.1. Features of the Demodulator and Decoder
Sections
The MSP 3410 B is designed to simultaneously perform
digital demodulation and decoding of NICAM-coded TV
stereo sound, as well as demodulation of FM-mono TV
sound. Alternatively, two carrier FM systems according
to the German or Korean terrestrial specs or the satellite
specs can be processed with the MSP 3410 B.
Since it is simple and economic to demodulate AM
sound carriers with conventional sound-IF-mixing units,
the AM demodulation feature of the MSP will seldom be
used. However, for FM carrier detection in satellite oper-
ation the AM demodulation offers a powerful feature to
calculate the carrier field strength, which can be used for
automatic search algorithms. So the IC facilitates a first
step towards multistandard capability with its very flex-
ible application and may be used in TV-sets, satellite
tuners and video recorders.
The MSP 3410 B facilitates profitable multistandard ca-
pability, offering the following advantages:
– two selectable analog inputs (TV- and SAT-IF sources)
– Automatic Gain Control (AGC) for analog input: input
range: 0.14 – 3 Vpp
– integrated A/D converter for sound-IF inputs
– all demodulation and filtering is performed on chip and
is individually programmable
– simple realization of both digital NICAM standards
(UK/Scandinavia)
– no external filter hardware is required
– only one crystal clock (18.432 MHz) is necessary
– Pay-TV for NICAM-mode
– FM carrier level calculation for automatic search algo-
rithms and carrier mute function
– high deviation FM-mono mode (max. deviation:
approx. ±360 kHz)
2.2. Features of the DSP-Section
– flexible selection of audio sources to be processed
– digital input and output interfaces via S-Bus for DMA-
via AMU, and via I2S-Bus for external DSP-Proces-
sors featuring Graphic Equalizer, Surround Sound etc.
– performance of all deemphasis systems including
adaptive Wegener Panda 1 without external compo-
nents or controlling
– performance of D2MAC audio together with an
AMU 2481
– digitally performed FM-identification decoding and de-
matrixing
– digital baseband processing: volume, bass, treble,
pseudostereo and basewidth enlargement
– simplified controlling of volume, bass, treble etc.
– increased audio bandwidth for FM-Audio-signals
(20 Hz – 15 kHz , ±1 dB)
2.3. Features of the Analog Section
– three selectable analog pairs of audio baseband in-
puts (=three SCART inputs)
Input level: ≤ 2 V RMS;
input impedance: ≥25 kΩ
– one selectable analog mono input (i.e. AM sound);
Input level: ≤ 2 V RMS;
input impedance: ≥10 kΩ
– two high quality A/D converters; S/N-Ratio: ≥85 dB
– 20 Hz to 20 kHz Bandwidth for SCART-to-SCART-
Copy facilities
– MAIN (loudspeaker) and AUX (headphones): two
pairs of 4-fold oversampled D/A-converters
Output level per channel: max. 1.4 VRMS
Output resistance: max. 5 kΩ
S/N-Ratio: ≥85 dB at maximum volume
max. noise voltage in mute mode: ≤ 10 µV (BW: 20 Hz
... 16 kHz)
– one pair of four-fold oversampled D/A-converters sup-
plying two selectable pairs of SCART-Outputs. Output
level per channel: max. 2 V RMS, output resistance:
max. 0.5 kΩ, S/N-Ratio: ≥85 dB
(20 Hz ... 16 kHz)
ITT Semiconductors
5
5 Page 
PRELIMINARY DATA SHEET
MSP 3410 B
4.1.8. MSP-Mute Function in the Dual Carrier FM
Mode
To prevent noise effects or FM identification problems in
the absence of one of the two FM carriers the MSP 3410
B offers a carrier detection feature, which must be acti-
vated by means of AD_CV[9], see section 11.2.1. If no
FM carrier is available at the MSP channel 1, the corre-
sponding channel FM2 (and S-Bus output samples 3
and 4) are muted. If no FM carrier is available at the MSP
channel 2, the corresponding channel FM1 (and S-Bus
output samples 1 and 2) are muted. In case of the ab-
sence of both FM carriers pure noise will be amplified by
the input AGC. Therefore a proper mute function de-
pends on the noise quality of the TV set’s IF part and
cannot be guaranteed. The mute function is not recom-
mended for the satellite mode.
4.1.9. DQPSK-Decoder
In case of NICAM-mode the phase samples are de-
coded according the DQPSK-Coding scheme. The out-
put of this block contains the original NICAM-bitstream,
which is available at the N-Bus interface.
4.1.10. NICAM-Decoder
Before any NICAM decoding can start, the MSP must
lock to the NICAM frame structure by searching and syn-
chronizing to the so-called Frame Alignment Words
(FAW).
To reconstruct the original digital sound samples the NI-
CAM-bitstream has to be descrambled, deinterleaved
and rescaled. Also bit error detection and correction
(concealment) is performed in this NICAM specific
block.
To facilitate the Central Control Unit CCU to switch the
TV-set to the actual sound mode, control information on
the NICAM mode and bit error rate are supplied by the
the NICAM-Decoder. It can be read out via the I2C-Bus.
4.2. Analog Section: SCART Switches and Standby
Mode
The analog input and output sections offer a wide range
of switching facilities, which are shown in Fig. 4–3.To de-
sign a TV set with 3 pairs of SCART-inputs and two pairs
of SCART-outputs, no external switching hardware is re-
quired.
The switches are controlled by the ACB bits defined in
the audio processing interface (see section 12. Pro-
gramming the Audio Processing Part).
If the MSP 3410 B is switched off by first pulling STAND-
BYQ low and then disconnecting the 5V but keeping the
8V power supply (‘Standby’-mode), the switches S1,
ITT Semiconductors
S2 and S3 maintain their position and function. This fa-
cilitates the copying from selected SCART-inputs to
SCART-outputs in the TV-set’s standby mode.
SCART_IN
SC1_IN_L/R
MONO_IN
SC1_IN_L/R
SC3_IN_L/R
ACB[1:0]
00 to Audio Baseband
Processing (DFP_IN)
01 A
10 D
11
S1
SCARTL/R
ACB[3:2]
from Audio Baseband
Processing (DFP)
D
SCARTL/R
A
00
01
10
11
S2
ACB[5:4]
SCART_OUT
SC1_OUT_L/R
00
01
10
S3
SC2_OUT_L/R
Fig. 4–3: SCART-Switching Facilities
Bold lines determine the default configuration
In case of power-on start or starting from standby, the IC
switches automatically to the default configuration,
shown in the figure above. This action takes place after
the first I2C transmission into the DFP part. By transmit-
ting the ACB register first, the individual default setting
mode of the TV set can be defined.
4.3. MSP 3410 B Audio Baseband Processing
By means of the DFP processor all audio baseband
functions are performed by digital signal processing
(DSP). The DSP functions are grouped into three pro-
cessing parts: Input preprocessing, channel selection
and channel postprocessing.
The input preprocessing is intended to prepare the vari-
ous signals of all input sources in order to form a stan-
dardized signal at the input to the channel selector. The
signals can be adjusted in volume, are processed with
the appropriate deemphasis and are dematrixed if nec-
essary.
Having prepared the signals that way, the channel selec-
tor makes it possible to distribute all possible source sig-
nals to the desired output channels.
The ability to route in an external coprocessor for special
effects like graphic equalizer, surround processing, and
sound field processing is of special importance. Routing
can be done with each input source and output channel
via the I2S inputs and outputs.
All input and output signals can be processed simulta-
neously with the exception that FM2 cannot be pro-
11
11 Page | ||
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