MSP44X0G 데이터 시트보기 (PDF) - Micronas

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MSP44X0G

Multistandard Sound Processor Family

Micronas 

PRELIMINARY DATA SHEET

MSP 44x0G

2.5.5.1. Dynamic Amplification

Low frequency signals can be boosted while the output

signal amplitude is measured. If the amplitude comes

close to a definable limit, the gain is reduced automati-

cally in dynamic Volume mode. Therefore, the system

adapts to the signal amplitude which is really present

at the output of the MSP device. Clipping effects are

avoided.

2.6. SCART Signal Routing

2.6.1. SCART DSP In and SCART Out Select

The SCART DSP Input Select and SCART Output

Select blocks include full matrix switching facilities. To

design a TV set with four pairs of SCART-inputs and

two pairs of SCART-outputs, no external switching

hardware is required. The switches are controlled by

the ACB user register (see page 42).

MDB_LIMIT

MDB_HP

MDB_LP

SUBW_FREQ

Fig. 2–5: Dynamic Amplification

Frequency

2.5.5.2. Adding Harmonics

MDB exploits the psychoacoustic phenomenon of the

‘missing fundamental’. Adding harmonics of the fre-

quency components below the cutoff frequency gives

the impression of actually hearing the low frequency

fundamental. In other words: The listener has the

impression that a loudspeaker system seems to repro-

duce frequencies although physically not possible.

2.6.2. Stand-by Mode

If the MSP 44x0G is switched off by first pulling

STANDBYQ low and then (after >1 µs delay) switching

off DVSUP and AVSUP, but keeping AHVSUP

(‘Stand-by’-mode), the SCART switches maintain

their position and function. This allows the copying

from SCART-input to SCART-output in the TV set’s

stand-by mode.

In case of power on or starting from stand-by (switch-

ing on the DVSUP and AVSUP, RESETQ going high

2 ms later), all internal registers except the ACB regis-

ter (see page 42) are reset to the default configuration

(see Table 3–5 on page 21). The reset position of the

ACB register becomes active after the first I2C trans-

mission into the Baseband Processing part. By trans-

mitting the ACB register first, the reset state can be

redefined.

MDB_HP

Fig. 2–6: Adding Harmonics

Frequency

2.5.5.3. MDB Parameters

Several parameters allow tuning the characteristics of

MDB according to the TV loudspeaker, the cabinet,

and personal preferences (see Table 3–11). For more

detailed information on how to set up MDB, please

refer to the corresponding application note on the

Micronas homepage.

Micronas

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