Technology of Q 2500 colour TV set

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Technology of Q 2500 colour TV set4.2.14 Signal pathAll FBAS or Y/C signals delivered by the receivingunits, the three Euro/AV sockets of thefront interface, are directed via the video matrixswitch to the video processor VPC 3230.The FBAS or Y signal is led from pin 17 ofI 1711, via the impedance converter Q 1814 topin 73 of the video processor I 2271. The filterin the Y/FBAS path consisting of L 2259/57and the associated capacitors has low passcharacteristics. Frequency components over 7MHz are efficiently suppressed by the filter.This prevents floating effects in the video signal,that may arise from the cycle rate of theADC and residual signals from neighbouringchannel. For Y/C operation the chroma signalmoves from pin 14 of I 1721, via the emitterfollower of Q 1824 to filter L/C 2266, whichsuppresses noise components, and then tochroma input pin 72 of 2271.VPC 3230 is also equipped with two RGB inputinterfaces.Pins 1-3 of I 2271 are connected directly tothe Euro/AV socket 2 via the correspondinginput filter. The associated fast-blank signal isapplied to I 2271 on pin 79.Q 2226 prevents the FB voltage exceeding2.2 V and thereby damaging the videoprocessor.RGB operation via the Euro/Avc socket 2is therefore also fast blank compatible. Y/U/Voperation is also possible from the secondRGB input from pin 4 of I 2271 , 5 and 6. TheRGB signals are fed from the optimum DVBmodule or from the Euro/A socket 3 via thisinput. The same goes for the Y/U/V signals ofthe Euro/AV socket 3. The inputs 4, 5 and 6from I 2271 are not fast blank compatible.The video processor VPC 3230 digitises andfully processes the FBAS analogue input signalsor Y/C signal. On the output there is adigital 8-bit wide luminance and an 8-bit widedemodulated chroma signal with its U/V components.The luminance and chroma signalsare transferred in multiplex procedures viaeight LM0-7 lines. The amplitude on the linesis 3.3 Vss. The associated cycle frequency is27 MHz and is output from pin 27 on I 2271.In SAA 4979 the luminance and chroma signalsare led to a demultiplexer and read intothe internal half picture memory. Selectionresults with the 100 Hz cycle rate of 32 MHz.With 3 Mbit, slightly more than a half picturecan be stored in intermediate memory, whichpermits continuous single and dual selection.The next IC in the signal path, SAA 4993, isresponsible for noise suppression and variousinterpolations. Noise suppression is implementedby signal from the output, which hasalready been processed, being delayed for ahalf picture by the second half picture memoryand then mixed with the currently applied signal.In addition, this IC suppresses the intermediateline shimmer. Line interpolation also occurs,so that 576 lines can be displayed in allzoom functions. Movements between the picturesare also interpolated, to ensure a continuousmovement process over all half pictures.SAA 4979, which is the next IC in the signalpath, is used mainly as a DAC and for thecontrol of the digital 100 Hz video processingin the circuit.In the chroma branch there is a circuit for improvingcolour transitions. It is used to increasethe slope of the colour transition flanksin the differentiation and adder stages.Document Q 2500 80 © Loewe ProCollege
Technology of Q 2500 colour TV setQ2500/H video signal pathCh. HDR/DVD W1512-86Ch. SAT/DVB1 W1506-8Ch. FRONT W1521-83Ch. DVB2 W1416-8Y/CVBS AV2-19Y/CVBS AV1-19Ch. AV2-15Ch. AV1-158Ch. AV3-15Ch. AV1-7Ch. AV1-15Ch. AV2-712133Y/CVBS AV2 - 20Y/CVBS AV1 - 20CVBS-TUNER W1211-1Y/CVBS-SAT/DVB1 W1506-6Y/CVBS-FRONT W1521-6201110552010 1186CVBS-PIP W1211-13 ( *)5Y/CVBS-DVD/HDR W1512-63I1731TEA6415VIDEO MATRIX SWITCHCHROMAI1771/4053CHROMAAV1/2 Pin 7/15144I1711TEA6415VIDEO MATRIX SWITCHCVBS/Y(*) for TwinSat Jumper B2 removed!CVBS W1416-61Y/CVBS AV3 - 201813171416 14 13 17 1815FBAS121ChromaCVBS/YAV2R G B FBFAY0-7FAC0-7R G BV Y U1LC0-7 1LC0-7I2311SAA4979HBESICI16314053RGB/YUVI2151VPC3233PIPI2451SAA4955I2421SAA4993FALCONIC72732L0-72C0-7LS0-7793C0-31I2461SAA49552I2461SAA495536 5 4D0-16I2801CCUI2916SDRAM16MBI2271VPC3230MAIN3Y0-7H-Synch/VGA75V-Synch/VGA74105112 113 114R G B FB35 36 37 38Y/Pin28U/PIN27V/PIN26R32 31 30B G4 6 8 10 12W1011/VGAH-SynchV-Synch4Y0-74C0-36C0-36Y0-75Y0-75C0-3AV3 - 15AV3 - 11AV3 - 7Synch auf YW1611 DVB2 4 6R G B R G B3 1 13 5 2 12910114 15 14R G BVY UH = DVBL = AV36 FBAS/Y8Chr.73 72 Chr.TVO W1531H-Link W1541FBAS/Y3 YChr.7174117HD 103VD 102LM0-744 Cut offVD55HD454W1051RGB4041427L0-77C0-7R/ AV2 - 15G/ AV2 - 11B/ AV2 - 7FB/ AV2 - 167L0-77C0-7HD 24VD 23I2461SAA49551 V-I2521TDA9332HOP444648W15112 V+3 EW8 H-outFP4 43 BLCVFLBHFLB13 9Document Q 2500 81 © Loewe ProCollege
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