MSP3410D datasheet(33/83 Pages) MICRONAS

33 / 83 page

PRELIMINARY DATA SHEET

MSP 34x0D

Micronas

6.6.5. ERROR_RATE 0057hex

Average error rate of the NICAM reception in a time

interval of 182 ms, which should be close to 0. The ini-

tial and maximum value of ERROR_RATE is 2047.

This value is also active, if the NICAM bit of

MODE_REG is not set. Since the value is achieved by

filtering, a certain transition time (appr. 0.5 sec) is

unavoidable. Acceptable audio may have error_rates

up to a value of 700dec. Individual evaluation of this

value by the CCU and an appropriate threshold may

define the fallback mode from NICAM to FM/AM-Mono

in case of poor NICAM reception.

The bit error rate per second (BER) can be calculated

by means of the following formula:

BER = ERROR_RATE

× 12.3 × 10−6 /s

the

automatic

switching

feature

applied

(AUTO_FM; section 6.4.2. on page 24), reading of

ERROR_RATE can be omitted.

6.6.6. CONC_CT (for compatibility with MSP 3410B)

This register contains the actual number of bit errors of

the

728-bit

data

frame.

Evaluation

CONC_CT is no longer recommended.

6.6.7. FAWCT_IST (for compatibility with MSP 3410B)

For compatibility with MSP 3410B this value equals 12

as long as NICAM quality is sufficient. It decreases to 0

NICAM

reception

gets

poor.

Evaluation

FAWCT_IST is no longer recommended.

6.6.8. PLL_CAPS

It is possible to read out the actual setting of the

PLL_CAPS. In standard applications, this register is

not of interest for the customer.

6.6.9. AGC_GAIN

It is possible to read out the actual setting of

AGC_GAIN in Automatic Gain Mode. In standard

applications, this register is not of interest for the cus-

tomer.

6.7. Sequences to Transmit Parameters

and to Start Processing

After having been switched on, the MSP has to be ini-

tialized by transmitting the parameters according to the

LOAD_SEQ_1/2 (see Table 6–15 on page 34). The

data are immediately active after transmission into the

MSP.

longer

necessary

transmit

LOAD_REG_1/2 or LOAD_REG_1 as it was for

MSP 34x0B.

Nevertheless,

transmission

LOAD_REG_1/2 or LOAD_REG_1 does no harm.

For NICAM operation, the following steps listed in

‘NICAM_WAIT, _READ, and _CHECK’ in Table 6–15

must be taken.

For FM-Stereo operation, the evaluation of the identifi-

cation signal must be performed. For a positive identifi-

cation check, the MSP 3410D sound channels have to

be switched corresponding to the detected operation

mode.

PLL_CAPS

021Fhex

minimum frequency

0111 1111

7Fhex

nominal frequency

0101 0110

56hex

RESET

maximum frequency

0000 0000

00hex

AGC_GAIN

021Ehex

max. amplification

(20 dB)

0001 0100

14hex

min. amplification

(3 dB)

0000 0000

00hex

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