Technology of Q 2500 colour TV set
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Technology of Q 2500 colour TV set

Technology of Q 2500 colour TV set Technology of Q 2500 colour TV set

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Technology of Q 2500 colour TV set4 Signal boardMounted on the signal board, which is linkedto the basic board via connectors, are all thenecessary building blocks for device control,interface switching, video, audio and videotextprocessing.These are:- The device control with computer circuit,operating software and the EAROM for thestoring of system data and customer specificcalibration values.- Production of system cycle frequency necessaryfor a digital design.- The digital IC’s necessary for picture signalprocessing.- The video/deflection processor for the productionand synchronization of controlpulses.- Digital audio processing for analogue transferredinformation and NICAM decoding.- The teletext decoder, integrated into theSDA 6000, with page memory, in which upto 3000 text pages, according to design,can be saved and which also generates theOSD for the user control.- The signal and interface selection by correspondingIC’s controllable via the I²C bus.- Optional IC’s for video processing, picturein picture.4.1 Device controlFull device control is implemented by a Siemens16 bit processor (SDA 6000) togetherwith Loewe operating software. The teletextfunction is also integrated into the SDA 6000.A standalone teletext processor is thereforenot necessary.All processes in the digital signal preparation,in the tuners and interface selection arechecked and controlled via a microcomputerintegrated into the SDA 6000. The processoris also known as the CCU (Central ControlUnit).It also supports the operating, tuning andstorage system on the frequency synthesisprinciple. Without the DVB module there are220 programme storage locations, and withthe DVB board there are 1470. The programmelocations are available for TV andalso for radio operation. The total number ofstored programs must not exceed 220 (1470).For the AV inputs six additional places arereserved.Operating software is held in an externalEPROM. For the storage of c.r.t. and systemspecific data there is an EAROM for devicecontrol. The latter also contains programmelocation information.All three modules, CCU, EPROM and EAROMare mounted on the signal board.The remote maintenance sensor permits controlof possible device functions. The chassistuning is also carried out by remote maintenance.For this, the sensor IC generates a serial dataword for each command that is transferred tothe receiver with a delay. This signal is demodulatedby the IR receiver and prepared insuch a way that it can be sent directly to theCCU as an RSIG signal.The CCU detects the local operating commandson a line by the different voltage levels.Document Q 2500 60 © Loewe ProCollege

Technology of Q 2500 colour TV setBlock diagram - Device controlIR transmitterReceiverunit 1PIPrecieverunitPIPprocessorInterfaceICsSAT or Twin-SATI2C-Bus 1I2C-Bus 2SDRAMIRrecieverLocaloperationSDA 6000AddressesEPROMI 2926DataStandbyPSUStandbyandON - LED6 MHzReset inReset outSwitchinginputs andoutputsIR-OutEuro/AVTVORS232Service/Controlto DVB/TV-OnlineVideo processing50 Hz 100HzI2C-Bus 0Audio processingEAROM 1EAROM 2DeflectionThe CCU operates as a central control andinformation module. The software is held in asexternal EPROM. It concerns data necessaryfor the control of the digital IC’s, tuning, OSD’setc.For control of all processes in the device the C161 bus system:- generates I²C bus 0transmits data to and from the EAROM. Inaddition it controls the picture and audiosignal processing.- generates I²C bus1controls the 1st and 2nd receiver unit onthe basic board, the switching IC’s for theaudio and video signals on the signal boardand the optional PIP processor.- generates I²C bus 2controls the satellite units and partially controlsthe switching IC´s for audio and video.Dokument Q 2500 61 © Loewe ProCollege

<strong>Technology</strong> <strong>of</strong> Q <strong>2500</strong> <strong>colour</strong> <strong>TV</strong> <strong>set</strong>Block diagram - Device controlIR transmitterReceiverunit 1PIPrecieverunitPIPprocessorInterfaceICsSAT or Twin-SATI2C-Bus 1I2C-Bus 2SDRAMIRrecieverLocaloperationSDA 6000AddressesEPROMI 2926DataStandbyPSUStandbyandON - LED6 MHzRe<strong>set</strong> inRe<strong>set</strong> outSwitchinginputs andoutputsIR-OutEuro/AV<strong>TV</strong>ORS232Service/Controlto DVB/<strong>TV</strong>-OnlineVideo processing50 Hz 100HzI2C-Bus 0Audio processingEAROM 1EAROM 2DeflectionThe CCU operates as a central control andinformation module. The s<strong>of</strong>tware is held in asexternal EPROM. It concerns data necessaryfor the control <strong>of</strong> the digital IC’s, tuning, OSD’<strong>set</strong>c.For control <strong>of</strong> all processes in the device the C161 bus system:- generates I²C bus 0transmits data to and from the EAROM. Inaddition it controls the picture and audiosignal processing.- generates I²C bus1controls the 1st and 2nd receiver unit onthe basic board, the switching IC’s for theaudio and video signals on the signal boardand the optional PIP processor.- generates I²C bus 2controls the satellite units and partially controlsthe switching IC´s for audio and video.Dokument Q <strong>2500</strong> 61 © Loewe ProCollege

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