MSP4458 datasheet(75/85 Pages) MICRONAS

75 / 85 page

PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

The ERROR_RATE value of 700 corresponds to a

BER of approximately 5.46*10-3/s.

Individual configuration of the threshold can be done

using Table 6–5, whereby the bits [0] and [11] of

AUTO_FM are ignored. It is recommended to use the

internal setting used by the standard selection.

The optimum NICAM sound can be assigned to the

MSP output channels by selecting one of the “Stereo or

A/B”, “Stereo or A”, or “Stereo or B” source channels.

6.3.1.2. Function in Manual Mode

If the manual mode (MODUS[0]=0) is required, the

activation and configuration of the Automatic Switching

feature has to be done as described in Table 6–5.

Note, that the channel matrix of the corresponding out-

put

channels

must

set

according

the

NICAM mode and need not to be changed in the

FM/AM-fallback case.

Example:

Required threshold = 500: bits [10:1]=00 1111 1010

Table 6–5: Coding of Automatic NICAM/Analog Sound Switching;

Reset Status: Mode 0;

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

Mode

Description

AUTO_FM [11:0]

Addr. = 00 21hex

ERROR_RATE-

Threshold/dec

Source Select:

Input at NICAM Path1)

Automatic Switching with

internal threshold

(Default, if Automatic Sound

Select is on)

Bit[11]

= ignored

Bit[10:1] = 0

Bit[0]

= ignored

700

NICAM or FM/AM,

depending on

ERROR_RATE

Automatic Switching with

external threshold

(Customizing of Automatic

Sound Select)

Bit[11]

= ignored

Bit[10:1] = 25...1000

= threshold/2

Bit[0]

= ignored

set by customer;

recommended

range: 50...2000

1) The NICAM path may be assigned to “Stereo or A/B”, “Stereo or A”, or “Stereo or B” source channels

(see Table 2–2 on page 11).

Table 6–6: Coding of Automatic NICAM/Analog Sound Switching;

Reset Status: Mode 0;

Automatic Sound Select is off (MODUS[0] = 0)

Mode

Description

AUTO_FM [11:0]

Addr. = 00 21hex

ERROR_RATE-

Threshold/dec

Source Select:

Input at NICAM Path

Forced NICAM

(Automatic Switching disabled)

Bit[11]

= 0

Bit[10:1] = 0

Bit[0]

= 0

none

always NICAM; Mute in

case of no NICAM available

Automatic Switching with

internal threshold

(Default, if Automatic Sound

Select is on)

Bit[11]

= 0

Bit[10:1] = 0

Bit[0]

= 1

700

NICAM or FM/AM,

depending on

ERROR_RATE

Automatic Switching with

external threshold

(Customizing of Automatic

Sound Select)

Bit[11]

= 0

Bit[10:1] = 25...1000

= threshold/2

Bit[0]

= 1

set by customer;

recommended

range: 50...2000

Forced Analog Mono

(Automatic Switching disabled)

Bit[11]

= 1

Bit[10:1] = 0

Bit[0]

= 1

none

always FM/AM

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