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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<strong>Technology</strong> <strong>of</strong> Q <strong>2500</strong> <strong>colour</strong> <strong>TV</strong> <strong>set</strong>The picture signal processing is mainly in digitalform, with ICs from different manufacturersbeing used. The video processor VPC 3230developed by Intermetall is used in the frontend. A Philips IC <strong>set</strong> is used for the 100 Hzprocessing. This IC <strong>set</strong> was reduced by higherintegration to two chips and the two half picturememories. The new SAA 4993 in theQ <strong>2500</strong> chassis is used for the latter. The microcontroller,the memory controller, the50/100Hz memory and the DAC are all combinedin the SAA 4979 (BESIC). In the backend <strong>of</strong> the Q <strong>2500</strong> chassis there is a new processorthat contains both the video and thedeflection function. The Philips TDA 9332video/deflection processor has the item numberI 2521.In addition, the Q <strong>2500</strong> chassis can also beoptionally equipped with picture in pictureprocessing. This enables one or three smallpictures to be inserted (see picture in picture).A split screen is also possible for the first time.4.2.13 Components for signal processingThe following is a short overview <strong>of</strong> the componentsand their functions as used for signalprocessing. The signal path, pin-assignmentsand the exact functioning is explained later.The processing is also described in detaillater.- VPC 3230Video processor8-bit ADC for FBAS and Y/C signals4-line comb filterMulti standard <strong>colour</strong> decoder for PAL/NTSC and SECAM20.25 MHz clock generatorLetterbox detectorLine compression and decompressionfor zoom modes(Falconic: Field and line rate converterwith noise reduction IC)Dynamic noise suppression <strong>set</strong> by user.Suppression <strong>of</strong> intermediate line flickeringDLC (Digital Lineflicker Reduction).Suppression <strong>of</strong> motion in horizontal movement,DMI (Digital Motion Interpolation).Suppression <strong>of</strong> motion in movies, DMM(Digital Movie Mode).Line interpolation, in order to display 576lines in all zoom functions, DLI (Digital LineInterpolation).- SAA 4979(BESIC: Back End System control IC)The integrated half picture memory is for50/100Hz conversion.Control <strong>of</strong> 100 Hz signal processingSynchronisation <strong>of</strong> 32 MHzPeaking and CTI (Colour TransientImprovement) to improve Y andchroma interfaces.Horizontal samplingDAC for Y, R-Y and B-Y- TDA 9332(Video/deflection processor)Inputs for two separate RGB signals.PAL/SECAM and NTSC matrix for production<strong>of</strong> RGB signals.Colour saturation, brightness and contrast<strong>set</strong>tings.Automatic Cut Off and leakage current controland <strong>set</strong>ting.Beam current limitation circuit.RGB output amplifier.Production <strong>of</strong> V/H deflection controlsignals- 2 x MSM SAA 4955 HLHalf picture memoryThe two half picture memories are necessaryfor the picturesignal intermediate storage andprocessing.- Philips SAA 4993Document Q <strong>2500</strong> 79 © Loewe ProCollege
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