Daewoo CP-520 Service Manual
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CP-520/520A/520F Service ManualDTV R&D Europe 43n Automatic decoder configuration and signal routing depending on the selected or detectedstandardn FM overmodulation adaptation option to avoid clipping and distortion5.3.1 Supported standardsThe multistandard capability of the TV Sound Processor covers all terrestrial TV sound standards,FM Radio and satellite FM.The AM sound of L/L' standard is normally demodulated in the 1st sound IF. The resulting AFsignal has to been tered into the mono audio input of the TV Sound Processor. A secondpossibility is to use the AMdemodulator in the DEMDEC part, however this may result in limitedperformance.Korea has a stereo sound system similar to Europe. It is supported by the TV Sound Processor.Differences include deviation, modulation contents and identification. It is based on M standard.Other features of the DEMDEC are:n M/BTSC and N standards supportedn M/Japan (EIAJ) supportedn FM Radio stereo decodingn Alignment-free, fully digital systemn For BTSC full dbx® performancen SAP demodulation (without dbx®) simultaneously with stereo decoding, or mono plus SAPwith dbx®n Line/pilot frequency selectable from 15.734 kHz and 15.625 kHz (or automatic detection /auto search)n High selectivity for pilot detection, high robustness against high-frequent audio componentsn Pilot lock indicatorn SAP detectorn Separate noise detectors for stereo and SAP with adjustable threshold levels, hysteresis, andautomute functionAn overview of the supported standards and sound systems and their key parameters is given inthe following tables.The analog multi-channel sound systems (A2, A2+ and A2*) are sometimes also named 2CS (2carrier systems).ANALOG 2-CARRIER SYSTEMS[Table] Frequency modulationMODULATIONSTANDARD SOUNDSYSTEMCARRIERFREQUENCY(MHz)FM DEVIATION(kHz)NOM./MAX./OVER SC1 SC2BANDWIDTH/DE-EMPHASIS(kHz/us)M Mono 4.5 15/25/50 Mono - 15/75M A2+ 4.5/4.724 15/25/50 1/2(L+R) 1/2(L+R) 15/75(Korea)B/G A2 5.5/5.742 27/50/80 1/2(L+R) R 15/50I Mono 6.0 27/50/80 mono - 15/50D/K(1) A2* 6.5/6.258 27/50/80 1/2(L+R) R 15/50D/K(2) A2* 6.5/6.742 27/50/80 1/2(L+R) R 15/50D/K(3) A2* 6.5/5.742 27/50/80 1/2(L+R) R 15/50[Table] Identification for A2 systems |
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