MSP3405D datasheet(13/71 Pages) ETC

13 / 71 page

MSP 34x5D

PRELIMINARY DATA SHEET

Micronas

4.2. Analog Section

4.2.1. SCART Switching Facilities

The analog input and output sections include full matrix

switching facilities, which are shown in Fig. 4–3.

The switches are controlled by the ACB bits defined in

the audio processing interface (see section 7. Program-

ming the DSP Section).

Fig. 4–3: SCART switching facilities (see 7.3.18.)

Switching positions show the default configuration af-

ter power-on reset. Note: SCART_OUT is undefined

after RESET!

ACB[6,11,10]

SCART_IN

SC1_IN_L/R

SC2_IN_L/R

from Audio Baseband

Processing (DSP_OUT)

SCART_OUT

SC1_OUT_L/R

ACB[5,9,8]

to Audio Baseband

Processing (DSP_IN)

MONO_IN

SCART1_L/R

SCARTL/R

pins

intern.

signal

lines

4.2.2. Stand-by Mode

If the MSP 34x5D is switched off by first pulling STAND-

BYQ low, and then disconnecting the 5 V, but keeping

the 8 V power supply (‘Stand-by’-mode), the switches

S1 and S2 (see Fig. 4–3) maintain their position and

function. This facilitates the copying from selected

SCART-inputs to SCART-outputs in the TV-set’s stand-

by mode.

In case of power-on start or starting from stand-by, the

IC switches automatically to the default configuration,

shown in Fig. 4–3. This action takes place after the first

I2C transmission into the DSP part. By transmitting the

ACB register first, the individual default setting mode of

the TV set can be defined.

4.3. DSP-Section (Audio Baseband Processing)

All audio baseband functions are performed by digital

signal processing (DSP). The DSP functions are

grouped into three processing parts: input preproces-

sing, channel source selection, and channel postpro-

cessing (see Fig. 4–5 and section 7.).

The input preprocessing is intended to prepare the vari-

ous signals of all input sources in order to form a stan-

dardized 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 nec-

essary.

Having prepared the signals that way, the channel selec-

tor makes it possible to distribute all possible source sig-

nals to the desired output channels.

All input and output signals can be processed simulta-

neously with the exception that FM2 cannot be pro-

cessed at the same time as NICAM. FM-identification

and adaptive deemphasis are not possible simulta-

neously (if adaptive deemphasis is active, the ID-level in

stereo detection register is not valid).

4.3.1. Dual Carrier FM Stereo/Bilingual Detection

For the terrestrial dual FM carrier systems, audio in-

formation can be transmitted in three modes: mono, ste-

reo, or bilingual. To obtain information about the current

audio operation mode, the MSP 34x5D detects the so-

called identification signal. Information is supplied via

the Stereo Detection Register to an external CCU.

IDENT

Demodu-

lation

Stereo

Detection

Stereo

Detection

Filter

Bilingual

Detection

Filter

Level

Detect

Level

Detect

–

Fig. 4–4: Stereo/bilingual detection

MSP3405D Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

MSP3405D Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

Datasheet Download

Link URL