Daewoo CP-520 Service Manual
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CP-520/520A/520F Service ManualDTV R&D Europe 46decoding is done in the DEMDEC block of the Sound DSP. The DEMDEC processing will bedescribed in the next chapter.The audio signals (AUD ADC IN) from the analogue crossbar pass the audio ADC and are feddirectly into the AUDIO part of the Sound DSP like the I2S signals, which is coming from I2Sprocessing hardware. After level adjust all signals from the DEMDEC and the I2S input areavailable at the digital input crossbar. A special input is provided for the Noise/Silence Generatorneeded for olby® Pro Logic® processing.In standard TV applications the main channel signal(L,R) will be connected to the DAC2 forreproduction at the speakers. With multichannel signals centre, surround or subwoofer channelsmay be passed to the I2S outputs where external DACs may be applied. By this it is possible tobuild Dolby Normal/Wide, Dolby Phantom Centre or Dolby 3 Stereo set-ups and also a VDS423application.5.4.3 Demodulator and decoderINTRODUCTIONThe TV sound processor provides an easy-to-use programming interface and built-in intelligencefor the demodulator and decoder part.The sound demodulator is able to search for sound carriers and react to transmission modechanges autonomously, without interaction of the micro controller software.It is possible for a typical terrestrial TV application to setup the entire demodulator withtransmission of few control words.The control interface still allows access to every detail, called demodulator expert mode, forspecial applications such as satellite TV, more elaborated search algorithms etc.The new TV Sound ProcessorDemodulator andDecoderEasyProgramming(DDEP)interfaceprovides three possible approaches to setup thedemodulator and decoder parts:n Auto Standard Detection (ASD)n Static Standard Selection (SSS)n Demodulator and Decoder Expert Mode (DDXM)MIXERThe digitized 2nd SIF input signal is fed to the mixers, which mix one or both input sound carriersdown to zero IF. The mixer frequency is derived by the standard setting (Easy Programming) orin the Demodulator and Decoder Expert Mode (DDXM) by a 24-bit control word for each carrier.For NICAM demodulation, a feedback signal is added to the control word of the second carriermixer to establish a carrier-frequency loop.FMANDAMDEMODULATIONAn FM or AM input signal is fed via a band-limiting filter to a one of two demodulators that can beused for either FM or AM demodulation. Four filters with different bandwidth are available. The |
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