13
Including:
CPU: RENESAS M16C (M30620SPGP)
Video decoder: SVP-EX62 / sub-screen TVP5147
AD conversion/line by line conversion /Teletext decodes: SVP-EX62
HDMI: SILICON IMAGE the second generation processing CMOS chip SiI9011
Audio processing: MSP3410
Sound power amplifier: D class audio MP7720 (single channel)
The CPU of the unit is M16C (N501) which mainly control the working of all CMOS chips, including
(receiving infrared telecontrol / keystoke, standby control, I/O control); the main CMOS chips is
SVP-EX62 (N201) which mainly in charge of function of the picture dispose, passage conversion,
picture display, menu display, picture effect adjust, accompany sound dispose (including volume
adjust, the control of high and low volume, stereo decode), the control of channel search,
TELETEXT decode.
2.sound parts:
The unit adopt double tuner (including tuner and IF amplifier circuit), antenna receives signals
sends the signals to the TUNER1, TUNER1 contains high frequency distributor, the RF signals
distribute one way to the TUNER2, thereinto the fourteen foot of TUNER1 supply the power (+5V)
for the high frequency distribution part. Tuner under the control of assistant CPU (N502) (SDA,
SCL) to choose the appropriate channel and then switch to the right TV system, output video
signals and audio signals after HF amplifier and IF amplifier decoding. The output signals of
TUNER1 sent to decoder SVP-EX62 as the main screen display, while TUNER2 sent to decoder
TVP5147 (N801) as the display of sub-screen.
Audio signals sent to audio processing MSP3410 (N101) directly, meanwhile double tuners will
send the SIF to N101 dispose (use to stereo decode and automatic volume control). N101 is
provided with audio channel switch, the audio input of mainboard (VGA/HDMI/YprPb signal) is sent
to N101 with TV and AV after via N707 chip switching. The audio signal: one-way via volume and
high-low sound control after, them left and right sound sent to sound power amplifier MP7720 and
then send to speaker. Other way left and right sound sent to earphone power amplifier JRC1109
(N104) after, them sent to earphone. The volume is controlled the controller signal (SDA and SCL),
other way sound of AV out the output SCART terminal of video board.
Audio processing IC
The diagram of MSP3410 shown as follows:
