Daewoo DTM-2930MP, Руководство по обслуживанию, Страница: 55 / 66

9.2 Functional Overview Of the digital controller sound part
The digital controller sound part consists of the SSIFADC, audio ADCs, DEMDEC HW, the
sound DSP core, audio DACs and I2S interface hardware as shown in fig below. The DEMDEC
part of the Sound DSP is used for the decoder and partly demodulator tasks. The AUDIO part
provides the sound features, from the level adjust unit up to the output crossbar. Audio DACs
and I2S hardware are converting the processed signals to analogue or digital audio.
The SSIF signal is applied to the SSIF ADC for conversion and is then fed to the DEMDEC
h a rd w a re p ro c e s s in g m a in ly fo r d e m o d u la tio n bu t a ls o so m e d e c o d in g ta s k s .
R e m a in in g d e co d in g is done in the DEM D EC blo ck of the S ound DSP. The D EM DEC
processing will be described in the next chapter.
The audio signals (AUD ADC IN) from the analogue crossbar pass the audio ADC and are fed
directly into the AUDIO part of the Sound DSP like the I2S signals, which is coming from I2S
processing hardware. After level adjust all signals from the DEMDEC and the I2S input are
available at the digital input crossbar. A special input is provided fo r the N oise/S ilence
Generator needed for olby® Pro Logic® processing.
In standard TV applications the main channel signal(L,R) will be connected to the DAC2 for
reproduction at the speakers. W ith m ultichannel signals centre, surround or sub w oofe r
channels may be passed to the I2S outputs where external DACs may be applied. By this it is
possible to build Dolby Normal/Wide, Dolby Phantom Centre or Dolby 3 Stereo set-ups and
also a VDS423 application.
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