MSP4448G datasheet(21/85 Pages) MICRONAS

21 / 85 page

PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

3.3.2.1. STANDARD SELECT Register

The TV sound standard of the MSP 44x8G demodula-

tor is determined by the STANDARD SELECT register.

There are two ways to use the STANDARD SELECT

– Setting up the demodulator for a TV sound standard

by sending the corresponding standard code with a

single I2C-Bus transmission.

– Starting the Automatic Standard Detection for ter-

restrial TV standards. This is the most comfortable

way to set up the demodulator. Within 0.5 s, the

detection and set-up of the actual TV sound stan-

dard is performed. The detected standard can be

read out of the STANDARD RESULT register by the

control processor. This feature is recommended for

the primary set-up of a TV set. Outputs should be

muted during Automatic Standard Detection.

The Standard Codes are listed in Table 3–7.

Selecting a TV sound standard via the STANDARD

SELECT register initializes the demodulator. This

includes: AGC, tuning frequency, band-pass filters,

demodulation mode (FM, AM, or NICAM), carrier

mute, deemphasis, and identification mode.

If a present sound standard is impossible for a specific

MSP version, it switches to the analog mono sound of

this standard. In that case, stereo or bilingual process-

ing will not be possible.

For a complete setup of the TV sound processing from

analog IF input to the source selection, the following

transmissions are necessary: MODUS register, STAN-

DARD SELECT register, prescale values, FM matrix.

Note: The FM matrix is set automatically if Automatic

Sound Select is active (MODUS[0]=1). In this case, the

FM matrix will be initialized with “Sound A Mono”. Dur-

ing operation, the FM matrix will be automatically

selected according to the actual identification informa-

tion.

3.3.2.2. STANDARD RESULT Register

If Automatic Standard Detection is selected in the

STANDARD SELECT register, status and result of the

Automatic Standard Detection process can be read out

of the STANDARD RESULT register. The possible

results are based on the mentioned Standard Code

and are listed in Table 3–8.

In cases where no sound standard has been detected

(no standard present, too much noise, strong interfer-

ers, etc.) the STANDARD RESULT register contains

00 00hex. In that case, the controller has to start further

actions (for example, set the standard according to a

preference list or by manual input).

As long as the STANDARD RESULT register contains

a value greater than 07 FFhex, the Automatic Standard

Detection is still active. During this period, the MODUS

and STANDARD SELECT register must not be written.

The STATUS register will be updated when the Auto-

matic Standard Detection has finished.

If a present sound standard is impossible for a specific

MSP version, it detects and switches to the analog

mono sound of this standard.

Example:

The MSPs 4438G and 4448G will detect a B/G-NICAM

signal as standard 3 and will switch to the analog FM-

Mono sound.

Table 3–8: Results of the Automatic Standard

Detection

Broadcasted Sound

Standard

STANDARD RESULT Register

Read 007Ehex

Automatic Standard

Detection could not

find a sound standard

0000hex

B/G-FM

0003hex

B/G-NICAM

0008hex

000Ahex

FM-Radio

0040hex

M-FM

EIA-J

BTSC

0002hex (if MODUS[14,13]=00)

0020hex (if MODUS[14,13]=01)

0030hex (if MODUS[14,13]=10)

L-AM

D/K1

D/K2

0009hex (if MODUS[12]=0)

0004hex (if MODUS[12]=1)

L-NICAM

D/K-NICAM

0009hex (if MODUS[12]=0)

000Bhex (if MODUS[12]=1)

Automatic Standard

Detection still active

>07FFhex

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