Daewoo DTL- 25G6F Service Manual download pdf (Page 30)

In case of power-on start or starting from standby, the IC switches automatically to the default

configuration, shown in the figure above. This action takes place after the first I

C transmission into the

DFP part. By transmitting the ACB register first, the default setting mode can be changed.

• MSP 3415D Audio Baseband Processing

By means of the DFP processor all audio baseband functions are performed by digital signal processing

(DSP). The DSP functions are grouped into three processing parts: Input preprocessing, channel selection

and channel postprocessing.

The input preprocessing is intended to prepare the various signals of all input sources in order to form a

standardized signal at the input to the channel selector. The signals can be adjusted in volume, are

processed with the appropriate deemphasis and are dematrixed if necessary.

Having prepared the signals that way, the channel selector makes it possible to distribute all possible

source signals to the desired output channels.

Of special importance is the ability to route in an external coprocessor for special effects like graphic

equalizer, surround processing and sound field processing. Routing can be done with each input source

and output channel via the I

S inputs and outputs.

All input and output signals can be processed simultaneously with the exception that FM2 cannot be

processed at the same time as NICAM. While processing the adaptive deemphasis, no dual carrier stereo

(German or Korean) or NICAM processing is possible. Identification values are not valid either.

• Dual Carrier FM Stereo/Bilingual Detection

In the German and Korean TV standard, audio information can be transmitted in three modes: Mono,

stereo or bilingual. To obtain information about the current audio operation mode, the MSP 3415D detects

the so-called identification signal. Information is supplied via the Stereo Detection Register to an external

CCU.

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Daewoo DTL- 25G6F Service Manual Page 30