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sound reproduction. M62494 is a virtual surrounding sound processing IC, which is subject to the control
of I/O port (77/78Pin) of N201 MPS3410.
The video signal output from the tuner, AV signal and Svideo signal, after matching with resistor,
directly enter, respectively from its own channel, into the main decoder IC N101(PanelTv-Svp), where
they are subject to video switch-over, A/D conversion, digital decoding, image zooming and OSD
superposition. Then they are output in electric level TTL to N601 DS90C383 (LVDS transmitting IC) for
driving the crystal display screen.
The Scart1 video signal and RGB signal, after matching with resistor, enter into the decoder IC
N401 (VPC3230 digital decoder), where they are subject to A/D conversion, and digital decoding. Then
they are fed in digital format into PanelTv-Svp for image zooming and OSD superimposition. Afterwards
they are further fed, in electric level TTL, into N601 DS90C383(LVDS IC) for driving the liquid crystal
display screen.
The Scart2 video signal and Y/C signal, after matching with resistor, enter into the decoder IC N401
(VPC3230 digital decoder), where they are subject to A/D conversion, and digital decoding. Then they
are fed in digital format (IUT656) into PanelTv-Svp for image zooming and OSD superimposition.
Afterwards they are further fed, in electric level TTL, into N601 DS90C383 (LVDS IC) for driving the
liquid crystal display screen.
For the specific circuit type and internal block diagram, please see the attached Fig.
2. Digital signal flow process:
(For the time being we call D-SUB, YpbPr signal also as digital signal. But in fact the two signals are
analog ones in terms of transmission and are only in digital format after conversion in ADC ) D-Sub
signal and YpbPr signal are, after matching with resister, fed into N703 video switch
(SN74CBT3257CDR). After switching over, the selected signal is fed into ADC N201 MST9883 for A/D
conversion. Then it is output in digital format of (24 digits RGB signal) to PanelTv-Svp PIP channel.
Through image zooming and OSD superimposition, it is then output, in electric level TTL for driving
LVDS liquid crystal display screen.
DVI signal is received through DVI receiving CMOS chip N761(TFP501DVI receiving chip
Has HDCP function). Then the received signal is output through DVI chip in digital format into
PanelTv-Svp PIP channel. After image zooming and OSD superimposition, it is output in electric level
TTL for driving LVDS liquid crystal display screen.
3. Realization of TELETEXT function
To realize the TELETEXT function of the main channel, this TV set adopts MCU
N501(SDA5550),SDA5550 of MICRONAS, which is both MCU and TELETEXT decoder. This set can
realize this function by two ways. One is that the radio frequency, after being decoded in SDA5550,
through parallel interfaced bus line, realizes the TELETEXT function in the form of OSD. The advantage
in this way is the result is relatively good and the characters/symbols are stable; the disadvantage is that
it is relatively slow for the TELETEXT function to appear through OSD. The other way is that the radio
frequency is decoded in SDA5550 into RGB signal, which is subject to A/D conversion in IC
N401(VPC3230 digital decoder) and then it is fed in digital format into PanelTv-Svp for the realization
of TELETEXT function. The advantage in this way is the speed the teletext comes out is faster and the
disadvantage is due to the fact that it is fed, in analog RGB form, into VPC3230 and goes through it, the
analog signal is easily subject to outside interference and thus the stability of characters/symbols is not
so good as the previous way (through OSD). We have chosen the first way. which in turn it is relatively
slow for the TELETEXT function to appear through OSD.
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