参数资料
型号: MAS3549F
厂商: MICRONAS SEMICONDUCTOR HOLDING AG
元件分类: Codec
英文描述: MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec
中文描述: 新加坡金融管理局35x9F的MPEG 2 / 3层,AAC音频解码器,G.729的附件A编解码器
文件页数: 51/92页
文件大小: 1186K
代理商: MAS3549F
DATA SHEET
MAS 35x9F
Micronas
June 30, 2004; 6251-505-1DS
51
VOLUME
00 12
Automatic Volume Correction (AVC) Loudspeaker Channel
bit[15:12] 0
hex
AVC off (and reset internal variables)
AVC on
8
hex
8
hex
4
hex
2
hex
1
hex
bit[11:8]
8 s decay time
4 s decay time
2 s decay time
20 ms decay time (intended for quick adaptation to the
average volume level after track or source change)
Note:
To reset the internal variables, the AVC should be switched off and then
on again during any track or source change. For standard applications, the
recommended decay time is 4 s.
AVC
00 11
Balance
bit[15:8]
Balance range
7F
hex
7E
hex
...
01
hex
00
hex
FF
hex
...
81
hex
80
hex
left
127 dB, right 0 dB
left
126 dB, right 0 dB
left
1 dB, right 0 dB
left 0 dB, right 0 dB
left 0 dB, right
1 dB
left 0 dB, right
127 dB
left 0 dB, right
128 dB
Positive balance settings reduce the left channel without affecting the right
channel; negative settings reduce the right channel leaving the left channel
unaffected.
BALANCE
00 10
Volume Control
bit[15:8]
Volume table with 1 dB step size
7F
hex
+
12 dB (maximum volume)
7E
hex
+
11 dB
...
74
hex
+
1 dB
73
hex
0 dB
72
hex
1 dB
...
02
hex
113 dB
01
hex
114 dB
00
hex
mute (reset)
Not used, must be set to 0
bit[7:0]
This main volume control is applied to the analog outputs only. It is split
between a digital and an analog function. In order to avoid noise due to large
changes of the setting, the actual setting is internally low-pass filtered.
With large scale input signals, positive volume settings may lead to signal clip-
ping.
VOLUME
Table 3–16:
Codec control registers on I
2
C subaddress 6C
hex
, continued
Register
Address
(hex)
Function
Name
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