MSP3400G データシートの表示（PDF） - Micronas

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MSP3400G

Multistandard Sound Processor Family

Micronas 

DATA SHEET

MSP 34x0G

2.5.7. Quasi-Peak Detector

The quasi-peak readout register can be used to read

out the quasi-peak level of any input source. The fea-

ture is based on following filter time constants:

attack time: 1.3 ms

decay time: 37 ms

2.5.8. Micronas BASS (MB)

The Micronas Bass system extends the frequency

range of loudspeakers or headphones.

After the adaption of MB to the loudspeakers and the

cabinet, further customizing of MB allows individual

fine tuning of the sound.

Micronas BASS is placed in the subwoofer path. For

applications without a subwoofer, the enhanced bass

signal can be added back onto the Left/Right channels

(see Fig. 2–1 on page 9). MB combines two effects:

dynamic amplification and adding harmonics.

2.5.8.2. Adding Harmonics

Micronas BASS exploits the psychoacoustic phenome-

non of the ‘missing fundamental’. Adding harmonics of

the frequency components below the cutoff frequency

gives the impression of actually hearing the low fre-

quency fundamental. In other words: The listener has

the impression that a loudspeaker system seems to

reproduce frequencies although physically not possi-

ble.

MB_HP

Fig. 2–7: Adding harmonics

Frequency

2.5.8.1. 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.

MB_LIMIT

MB_HP

MB_LP

SUBW_FREQ

Fig. 2–6: Dynamic amplification

Frequency

2.5.8.3. Micronas BASS Parameters

Several parameters allow tuning the characteristics of

Micronas BASS according to the TV loudspeaker, the

cabinet, and personal preferences (see Table 3–11).

For more detailed information on how to set up MB,

please refer to the corresponding application note.

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 41).

Micronas

May 27, 2003; 6251-476-1DS

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