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5. Introduction to main IC and principle block diagram
a). Sound processing IC(MSP3410)
Audio signal is fed directly into audio processor N201 MSP3410 whereas two-way tuner sends
intermediate frequency signal SIF of its second sound to N201 for processing (used for decoding of
stereo or automatic sound volume control. N201 is equipped with audio channel changeover switch.
The audio input VGA/DVI/YPrPb of the main board is subject to selection and switch over in
N704(HEF4052BT) and then sent to N201 together with the audio signal of TV and AV. The
selected audio signal is divided into several portions. One portion is sent separately through left and
right channels, after being subject to the control of volume and pitch(alt/bourdon), into SRS
IC(M62494 virtual surround sound processor) N203 for virtual surround sound processing. The
processed audio signal is then fed separately through left and right sound channels into digital
sound power amplifier N213/N214(MPS7720) for amplification, and then further fed into the
loudspeaker (In the future it may be changed into sound box for improved sound quality) for the
reproduction of sound. Another portion is fed separately through left and right sound channels into
the earphone power amplifier N212(TLE2142). After amplification there it is output to earphone jack
for listening to. The volume in controlled through I2C bus line by N201. The other two portions
are output, separately used as accompanying sound of TV out and AV out, through the port SCART
of the video board.
The block diagram of MSP3410 is shown in the Fig. below:
The main pins of MSP3410 in this TV model are described as follows:
2, 3:SCL and SDA, for the control of the operations of IC;
27, 28:output to the left and right channels of sound power amplifier;
24, 25: for left and right channels of earphone sound;
36, 37:AV OUT left and right sound channels;
33, 34:TV OUT left and right sound channels;
47, 48:fed from the main board to left and right sound channels;
50, 51:left and right channels of SCART2 sound;
53, 54:left and right channels of SCART1 sound;
Содержание BSV-2751
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