Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 152)

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AT85C51SND3Bx

7632A–MP3–03/06

Digital Volume Control The digital volume is controlled separately on right and left channel by setting the

DVR4:0 and DVL4:0 bits respectively in APRDVOL and APLDVOL according to

Table 154.

Table 154. Digital Volume Control Gain

Note: 1. When DVR4:0 and DVL4:0 are set to mute, audio processor is still sending data to

the audio codec or the audio interface with data set to the corresponding 0 value.

Equalizer Volume Control A 3-band equalizer control is provided for tone adjustment or predefined tone shapes

like classic, jazz, rock…

The equalizer gain is controlled in each band by programing DVB4:0 in APBDVOL for

the bass band, DVM4:0 in APMDVOL for the medium band and DVT4:0 in APTDVOL

for the treble band according to

Table 154. Cut frequencies are defined in Table 155.

In order to optimize the power consumption, the 3-band equalizer can be disabled by

setting EQUDIS in AUCON. In this case the band gain control is saved but no filtering is

applied.

Table 155. Equalizer Band Frequency

Bass Boost Effect A bass boost effect can be established by setting BBOOST bit in AUCON. It consists in

a gain increase of +6 dB in the frequency range under 200 Hz.

Virtual surround Effect A virtual surround effect can be established by setting VSURND bit in AUCON. It con-

sists in applying a spatial effect to sound on both right and left channels.

Equalizer Bar-Graph An 8-band bar-graph equalizer allows dynamic audio volume report inside 8 frequency

bands. To read the level of each band, first select the band by setting the EQBS2:0 bits

in APEBS from 000b (lowest frequency band) to 111b (highest frequency band) then get

the 5-bit band level by reading EQLEV4:0 bits in APELEV.

DVx4:0 Gain Value DVx4:0 Gain Value DVx4:0 Gain Value

00000 +6 dB 01011 -16dB 10110 -38 dB

00001 +4 dB 01100 -18 dB 10111 -40 dB

00010 +2 dB 01101 -20 dB 11000 -42 dB

00011 +0 dB 01110 -22 dB 11001 -44 dB

00100 -2 dB 01111 -24 dB 11010 -46 dB

00101 -4 dB 10000 -26 dB 11011 -48 dB

00110 -6 dB 10001 -28 dB 11100 -50 dB

00111 -8 dB 10010 -30 dB 11101 -52 dB

01000 -10 dB 10011 -32 dB 11110 -54 dB

01001 -12 dB 10100 -34 dB 11111 Mute

(1)

01010 -14 dB 10101 -36 dB

Band Frequencies

Bass F < 750 Hz

Medium 750 Hz < F < 3300 Hz

Treble F > 3300 Hz

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 262 263

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