MSP4458 datasheet(79/85 Pages) MICRONAS

79 / 85 page

PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

6.5. Manual Mode:

Description of DSP Write Registers

6.5.1. Additional Channel Matrix Modes

This table shows additional modes for the channel

matrix registers.

The sum/difference mode can be used together with

the quasi-peak detector to determine the sound mate-

rial mode. If the difference signal on channel B (right)

is near to zero, and the sum signal on channel A (left)

is high, the incoming audio signal is mono. If there is a

significant level on the difference signal, the incoming

audio is stereo.

6.5.2. FM Fixed Deemphasis

6.5.3. FM Adaptive Deemphasis

Note: The Adaptive Deemphasis WP1 requires setting

of fixed deemphasis to 75

µs.

6.5.4. NICAM Deemphasis

A J17 Deemphasis is always applied to the NICAM sig-

nal. It is not switchable.

6.5.5. 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. Read stereo detection register

Main Matrix

00 08hex

Aux Matrix

00 09hex

SCART1 Matrix

00 0Ahex

SCART2 Matrix

00 41hex

I2S Matrix

00 0Bhex

Quasi-Peak

Detector Matrix

00 0Chex

SUM/DIFF

0100 0000

40hex

AB_XCHANGE

0101 0000

50hex

PHASE_CHANGE_B

0110 0000

60hex

PHASE_CHANGE_A

0111 0000

70hex

A_ONLY

1000 0000

80hex

B_ONLY

1001 0000

90hex

FM Deemphasis

00 0Fhex

µs

0000 0000

00hex

RESET

µs

0000 0001

01hex

OFF

0011 1111

3Fhex

FM Adaptive

Deemphasis WP1

00 0Fhex

OFF

0000 0000

00hex

RESET

WP1

0011 1111

3Fhex

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

MSP4458 Datasheet(PDF) 79 Page - Micronas

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