AT83SND2CMP3B datasheet(65/241 Pages) ATMEL

65 / 241 page

4341F–MP3–03/06

AT8xC51SND2C/MP3B

13.2

Audio Controls

13.2.1

Volume Control

The MP3 decoder implements volume control on both right and left channels. The MP3VOR and

MP3VOL registers allow a 32-step volume control according to Table 13-2.

Table 13-2.

Volume Control

13.2.2

Equalization Control

Sound can be adjusted using a 3-band equalizer: a bass band under 750 Hz, a medium band

from 750 Hz to 3300 Hz and a treble band over 3300 Hz. The MP3BAS, MP3MED, and

MP3TRE registers allow a 32-step gain control in each band according to Table 13-3.

Table 13-3.

Bass, Medium, Treble Control

13.2.3

Special Effect

The MPBBST bit in MP3CON register allows enabling of a bass boost effect with the following

characteristics: gain increase of +9 dB in the frequency under 375 Hz.

13.3

Decoding Errors

The three different errors that can appear during frame processing are detailed in the following

sections. All these errors can trigger an interrupt as explained in Section "Interrupt", page 66.

13.3.1

Layer Error

The ERRSYN flag in MP3STA is set when a non-supported layer is decoded in the header of the

frame that has been sent to the decoder.

13.3.2

Synchronization Error

The ERRSYN flag in MP3STA is set when no synchronization pattern is found in the data that

have been sent to the decoder.

VOL4:0 or VOR4:0

Volume Gain (dB)

00000

Mute

00001

-33

00010

-27

11110

-1.5

11111

BAS4:0 or MED4:0 or TRE4:0

Gain (dB)

00000

∞

00001

-14

00010

-10

11110

11111

+1.5

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