CP-520/520A/520F Service Manual

nAutomatic decoder configuration and signal routing depending on the selected or detected standard

nFM overmodulation adaptation option to avoid clipping and distortion

5.3.1 Supported standards

The 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 AF signal has to been tered into the mono audio input of the TV Sound Processor. A second possibility is to use the AMdemodulator in the DEMDEC part, however this may result in limited performance.

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:

nM/BTSC and N standards supported

nM/Japan (EIAJ) supported

nFM Radio stereo decoding

nAlignment-free, fully digital system

nFor BTSC full dbx® performance

nSAP demodulation (without dbx®) simultaneously with stereo decoding, or mono plus SAP with dbx®

nLine/pilot frequency selectable from 15.734 kHz and 15.625 kHz (or automatic detection / auto search)

nHigh selectivity for pilot detection, high robustness against high-frequent audio components

nPilot lock indicator

nSAP detector

nSeparate noise detectors for stereo and SAP with adjustable threshold levels, hysteresis, and automute function

An overview of the supported standards and sound systems and their key parameters is given in the following tables.

The analog multi-channel sound systems (A2, A2+ and A2*) are sometimes also named 2CS (2 carrier systems).

ANALOG 2-CARRIER SYSTEMS [Table] Frequency modulation

 

 

SOUND

CARRIER

 

FM DEVIATION(kHz)

MODULATION

BANDWIDTH/

 

STANDARD

FREQUENCY

 

 

 

DE-EMPHASIS

 

SYSTEM

 

NOM./MAX./OVER

SC1

SC2

 

 

(MHz)

 

(kHz/us)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M

Mono

4.5

 

15/25/50

Mono

-

15/75

 

 

M

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

15/50

 

 

I

Mono

6.0

 

27/50/80

mono

-

15/50

 

 

D/K(1)

A2*

6.5/6.258

 

27/50/80

1/2(L+R)

R

15/50

 

 

D/K(2)

A2*

6.5/6.742

 

27/50/80

1/2(L+R)

R

15/50

 

 

D/K(3)

A2*

6.5/5.742

 

27/50/80

1/2(L+R)

R

15/50

 

 

[Table] Identification for A2 systems

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DTV R&D Europe

 

 

 

 

 

43

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Daewoo DTY-28A8, DTY-28A6, DTY-28A7 Other features of the Demdec are, Analog 2-CARRIER Systems Table Frequency modulation
Page 43 Page 45

DTZ-2481, DTZ-29U7/U3, DTC-21Y1/21Y2, DTY-21U7/21B4, DTY-2880/28W5 specifications

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