MAS3587F datasheet(46/82 Pages) MICRONAS

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MAS 3587F

ADVANCE INFORMATION

Micronas

Micronas Dynamic Bass (MDB)

00 22

MDB Effect Strength

bit[15:8]

00hex

MDB off (default)

7Fhex

maximum MDB

The MDB effect strength can be adjusted in 1dB steps. A value of 40hex will

yield a medium MDB effect.

MDB_STR

00 23

MDB Harmonics

bit[15:8]

00hex

no harmonics are added (default)

64hex

50% fundamentals + 50% harmonics

7Fhex

100% harmonics

The MDB exploits the psychoacoustic phenomenon of the ‘missing fundamen-

tal by creating harmonics of the frequencies below the center frequency of the

bandpass filter (MDB_FC). This enables a loudspeaker to display frequencies

that are below its cutoff frequency. The Variable MDB_HAR describes the ratio

of the harmonics towards the original signal.

MDB_HAR

00 24

MDB Center Frequency

bit[15:8]

20 Hz

330 Hz

...

300 Hz

The MDB Center Frequency defines the center frequency of the MDB band-

pass filter (see Fig. 3–4 on page 49). The center frequency should approxi-

mately match the cutoff frequency of the loudspeakers. For high end

loudspeakers, this frequency is around 50 Hz, for low end speakers around

90 Hz

MDB_FC

00 21

MDB Shape

bit[15:8]

5...30

corner frequency in 10-Hz steps

(range: 50...300 Hz)

With a second lowpass filter the steepness of the falling slope of the MDB

bandpass can be increased (see Fig. 3–4 on page 49). Choosing the corner

frequency of this filter close to the center frequency of the bandpass filter

(MDB_FC) results in a narrow MDB frequency range. The smaller this range,

the harder the bass sounds. The recommended value is around

1.5

× MDB_FC

MDB_SHAPE

MDB Switch

bit[7:2]

reserved, must be set to zero

bit[1]

MDB switch

0MDB off

1MDB on

bit [0]

reserved, must be set to zero

MDB_SWITCH

Table 3–12: Codec control registers on I2C subaddress 6Chex

Address

(hex)

Function

Name

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