Toshiba TLP710H Technisch trainingshandboek - Pagina 23
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6 . U P - C O N V E R T E R
6-1. Outline
This up-converter circuit performs the double speed
conversion which converts an interlace scanning signal of
approx. 15.75 kHz horizontal frequency in NTSC system
into a motion adaptable sequential scanning signal of
approx. 31.5 kHz.
C I R C U I T
Fig. 6-2-1 Block diagram of up-converter circuit
6-2 . Circuit Description
Fig. 6-2-1 shows the block diagram of this circuit.
6-2-1. Input Process Section
This section performs the gain adjustment and frequency
band width limitation of the input signal to the A/D
c o n v e r t e r c h a r a c t e r i s t i c s .
Among the video signal of Y (luminance), V, U (color)
signals entered from pins 11, 15 and 13 of PV001, Y
signal passes through the 6 dB amplifier and low pass
filter and enters pin 186 of QX300, motion adaptable
sequential scanning signal IC.
V, U (color) signals also pass thorough the amplifiers and
low pass filters in the same way as Y signal and enters
pins 195 and 14 of QX300.
6-1