MSP3401G datasheet(14/104 Pages) MICRONAS

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MSP 34x1G

PRELIMINARY DATA SHEET

Micronas

2.5.5. Micronas Dynamic Bass (MDB)

The Micronas Dynamic Bass system (MDB) extends

the frequency range of loudspeakers or headphones.

After the adaption of MDB to the loudspeakers and the

cabinet, further customizing of MDB allows individual

fine tuning of the sound.

The MDB is placed in the subwoofer path. For applica-

tions without a subwoofer, the enhanced bass signal

can be added back onto the Left/Right channels (see

Fig. 2–1 on page 9). Micronas Dynamic Bass com-

bines two effects: dynamic amplification and adding

harmonics.

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.

Fig. 2–5: Dynamic amplification

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 althoug physically not possible.

Fig. 2–6: Adding harmonics

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.

2.6. Virtual Surround System Application Tips

2.6.1. Sweet Spot

Good results are only obtained in a rather close area

along the middle axis between the two loudspeakers:

the sweet spot. Moving away from this position

degrades the effect.

2.6.2. Clipping

For the test at Dolby Labs, it is very important to have

no clipping effects even with worst case signals. That

is, 2 Vrms input signal may not clip. The SCART Input

Prescale register has to be set to values of 19hex

(25dec) or lower (see SCART Input Prescale on page

30).

Test signals: sine sweep with 2 VRMS; L only, R only,

L&R equal phase, L&R anti phase.

Listening tests: Dolby Trailers (train trailer, city trailer,

canyon trailer...)

Frequency

MDB_LIMIT

MDB_HP

MDB_LP

SUBW_FREQ

Frequency

MDB_HP

MSP3401G Datasheet(PDF) 14 Page - Micronas

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