MSP3401G datasheet(98/104 Pages) MICRONAS

98 / 104 page

MSP 34x1G

PRELIMINARY DATA SHEET

Micronas

6.5.5. NICAM Deemphasis

A J17 Deemphasis is always applied to the NICAM

signal. It is not switchable.

6.5.6. Identification Mode for A2 Stereo Systems

To shorten the response time of the identification algo-

rithm after a program change between two FM-Stereo

capable programs, the reset of the ident-filter can be

applied.

Sequence:

1. Program change

2. Reset ident-filter

3. Set identification mode back to standard B/G or M

4. Wait approx. 500 ms

5. Read stereo detection register

Note: This register is initialized during STANDARD

SELECTION and is automatically updated when Auto-

matic Sound Select (MODUS[0]=1) is on.

6.5.7. FM DC Notch

The DC compensation filter (FM DC Notch) for FM

input can be switched off. This is used to speed up the

automatic search function (see Section 6.4.7.). In nor-

mal FM-mode, the FM DC Notch should be switched

on.

6.6. Manual/Compatibility Mode:

Description of DSP Read Registers

All readable registers are 16-bit wide. Transmissions

via I2C bus have to take place in 16-bit words. Some of

the defined 16-bit words are divided into low and high

byte, thus holding two different control entities.

These registers are not writable.

6.6.1. Stereo Detection Register

for A2 Stereo Systems

Note: It is no longer necessary to read out and evalu-

ate the A2 identification level. All evaluation is per-

formed in the MSP and indicated in the STATUS regis-

ter.

6.6.2. DC Level Register

The DC level register measures the DC component of

the incoming FM signals (FM1 and FM2). This can be

used for seek functions in satellite receivers and for IF

FM frequencies fine tuning. A too low demodulation

frequency (DCO) results in a positive DC-level and

vice versa. For further processing, the DC content of

the demodulated FM signals is suppressed. The time

constant

τ, defining the transition time of the DC Level

Identification Mode

00 15hex

Standard B/G

(German Stereo)

0000 0000

00hex

RESET

Standard M

(Korean Stereo)

0000 0001

01hex

Reset of Ident-Filter

0011 1111

3Fhex

FM DC Notch

00 17hex

0000 0000

00hex

Reset

OFF

0011 1111

3Fhex

Stereo Detection

00 18hex

Stereo Mode

Reading

(two’s complement)

MONO

near zero

STEREO

positive value (ideal

reception: 7Fhex)

BILINGUAL

negative value (ideal

reception: 80hex)

DC Level Readout

FM1 (MSP-Ch2)

00 1Bhex

DC Level Readout

FM2 (MSP-Ch1)

00 1Chex

DC Level

[8000hex ... 7FFFhex]

values are 16 bit two’s

complement

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