MSP3410D datasheet(32/83 Pages) MICRONAS

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MSP 34x0D

PRELIMINARY DATA SHEET

Micronas

6.6.1. Autodetection of Terrestrial TV Audio Standards

By means of Autodetect, the MSP 34x0D offers a sim-

ple and fast (<0.5 s) facility to detect the actual TV

audio standard. The algorithm checks for the FM-

Mono and NICAM carriers of all common TV sound

standards. The following notes must be considered

when applying the Autodetect feature:

1. Since there is no way to distinguish between AM and

FM carrier, a carrier detected at 6.5 MHz is inter-

preted as an AM carrier. If video detection results in

SECAM East, the MSPD result “9” of Autodetect

must

reinterpreted

“Bhex” in case of

CAD_BITS[0] = 1, or as “4” or “5” by using the

demodulator short programming mode. A simple

decision can be made between the two D/K FM ste-

reo standards by setting D/K1 and D/K2 using the

short programming mode and checking the identifi-

cation of both versions (see Table 6–13 on page 31).

2. During active Autodetect, no I2C transfers besides

reading the autodetect result are recommended.

Results exceeding 07FFhex indicate an active auto-

detect.

3. The results are to be understood as static informa-

tion, i.e. no evaluation of FM or NICAM identification

concerning the dynamic mode (stereo, bilingual, or

mono) are done.

4. Before switching to Autodetect, the audio process-

ing part should be muted. Do not forget to demute

after having received the result.

6.6.2. C_AD_BITS

NICAM operation mode control bits and A[2...0] of the

additional data bits.

Format:

Important: “S” = Bit[0] indicates correct NICAM syn-

chronization (S=1). If S=0, the MSP 3410D has not

yet synchronized correctly to frame and sequence, or

has lost synchronization. The remaining read registers

are therefore not valid. The MSP 3410D mutes the

NICAM output automatically and tries to synchronize

again as long as MODE_REG[6] is set.

The operation mode is coded by C4...C1 as shown in

Table 6–14.

6.6.3. ADD_BITS [10...3] 0038hex

Contains the remaining 8 of the 11 additional data bits.

The additional data bits are not yet defined by the

NICAM 728 system.

Format:

6.6.4. CIB_BITS

Cib bits 1 and 2 (see NICAM 728 specifications).

Format:

MSB

C_AD_BITS 0023hex

LSB

...

7654

3210

Auto

_FM

...

A[2]

A[1]

A[0]

Table 6–14: NICAM operation modes as defined by

the EBU NICAM 728 specification

Operation Mode

Stereo sound (NICAM A/B),

independent mono sound (FM1)

Two independent mono signals

(NICAM A, FM1)

Three independent mono

channels (NICAM A, NICAM B,

FM1)

Data transmission only; no audio

Stereo sound (NICAM A/B), FM1

carries same channel

One mono signal (NICAM A).

FM1 carries same channel as

NICAM A

Two independent mono channels

(NICAM A, NICAM B). FM1

carries same channel as

NICAM A

Data transmission only; no audio

Unimplemented sound coding

option (not yet defined by EBU

NICAM 728 specification)

AUTO_FM: monitor bit for the AUTO_FM Status:

0: NICAM source is NICAM

1: NICAM source is FM

MSB

ADD_BITS 0038hex

LSB

54321

A[10]

A[9]

A[8]

A[7]

A[6]

A[5]

A[4]

A[3]

MSB

CIB_BITS 003Ehex

LSB

54321

xxxx

CIB1

CIB2

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