MSP3410D datasheet(35/83 Pages) MICRONAS

35 / 83 page

PRELIMINARY DATA SHEET

MSP 34x0D

Micronas

6.8. Software Proposals for Multistandard TV Sets

To familiarize the reader with the programming

scheme of the MSP 34x0D demodulator part, three

examples in the shape of flow diagrams are shown in

the following sections.

6.8.1. Multistandard Including System B/G

with NICAM/FM-Mono only

Fig. 6–1 shows a flow diagram for the CCU software,

applied for the MSP 3410D in a TV set, which facili-

tates NICAM and FM-Mono sound. For the instruc-

tions, please refer to Table 6–15.

If the program is changed, resulting in another pro-

gram within the Scandinavian System B/G, no param-

eters of the MSP 3410D need be modified. To facilitate

the check for NICAM, the CCU has only to continue at

the ’NICAM_WAIT’ instruction. During the NICAM

identification

process,

the

MSP 3410D

must

switched to the FM-Mono sound.

Fig. 6–1: CCU software flow diagram: standard B/G

NICAM/FM-Mono only with Demodulator Short

Programming Mode

6.8.2. Multistandard Including System I

with NICAM/FM-Mono only

This case is identical to the afore-mentioned. The only

difference consists in selecting the UK TV sound stan-

dard, which is coded with 000Ahex of register 0020hex.

6.8.3. Multistandard Including System B/G

with NICAM/FM-Mono and German DUAL-FM

Fig. 6–3 shows a flow diagram for the CCU software,

applied for the MSP 3410D in a TV set which supports

all standards according to system B/G. For the instruc-

tions used in the diagram, please refer to Table 6–15.

After having switched on the TV set and having initial-

ized the MSP 3410D (LOAD_SEQ_1/2), FM-Mono

sound is available.

Fig. 6–3 shows that to check for any stereo or bilingual

audio information, the TV sound standards 0008hex

(B/G-NICAM) and 0003hex must simply be set alter-

nately. If successful, the MSP 3410D must switch to

the desired audio mode.

6.8.4. Satellite Mode

Fig. 6–2 shows the simple flow diagram to be used for

the MSP 34x0D in a satellite receiver. For FM-Mono

operation, the corresponding FM carrier should prefer-

ably be processed at the MSP channel 2.

Fig. 6–2: CCU software flow diagram: SAT mode

6.8.5. Automatic Search Function for

FM Carrier Detection

The AM demodulation ability of the MSP 34x0D offers

the possibility to calculate the “field strength” of the

momentarily selected FM carrier, which can be read

out by the CCU. In SAT receivers, this feature can be

used to make automatic FM carrier search possible.

Therefore, the MSPD has to be switched to AM mode

(MODE_REG[8]),

prescale

must

set

7Fhex=+127dec, and the FM DC notch must be

switched off. The sound IF frequency range must now

be “scanned” in the MSPD channel 2 by means of the

programmable quadrature mixer with an appropriate

incremental frequency (i.e. 10 kHz).

LOAD_SEQ_1/2

Set

Sound Standard

Audio Processing

NICAM_WAIT

NICAM_CHECK

Pause

START

Init

0008hex

MSP-Channel 1

FM2-Parameter

MSP-Channel 2

FM1-Parameter

Audio Processing

START

STOP

Init

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