VESTEL 17MB15E-5, Service Manual

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15.13.1.
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 processed 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 the
Micronas virtualizer algorithm “3D-PANORAMA” which has been approved by the Dolby 1) Laboratories for with
the "Virtual Dolby Surround" technology. In addition, the MSP 34x1G includes the “PAN-ORAMA” algorithm.
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.
The MSP 34x1G 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 (Automatic
Sound Selection).
Source Select
I
2
S bus interface consists of five pins:
1. I2S_DA_IN1, I2S_DA_IN2: For input, four channels (two channels per line, 2*16 bits) per sampling cycle (32
kHz) are transmitted.
2. I2S_DA_OUT: For output, two channels (2*16 bits) per sampling cycle (32 kHz) are transmitted.
3. I2S_CL: Gives the timing for the transmission of I
2
S serial data (1.024 MHz).
4. I2S_WS: The I2S_WS word strobe line defines the left and right sample.
15.13.2.
Features
• Standard Selection with single I
2
C transmission
• Automatic Standard Detection of terrestrial TV standards
• Automatic Sound Selection (mono/stereo/bilingual), new registers MODUS, STATUS
• Two selectable sound IF (SIF) inputs
• Automatic Carrier Mute function
• Interrupt output programmable (indicating status change)
• Loudspeaker / Headphone channel with volume, balance, bass, treble, loudness
• AVC: Automatic Volume Correction
• Subwoofer output with programmable low-pass and complementary high-pass filter
• 5-band graphic equalizer for loudspeaker channel
• Spatial effect for loudspeaker channel
• Four Stereo SCART (line) inputs, one Mono input; two Stereo SCART outputs