参数资料
型号: MAS3587F
厂商: Electronic Theatre Controls, Inc.
元件分类: 通用总线功能
英文描述: MPEG Layer 3 Audio Encoder/Decoder
中文描述: MPEG层3音频编码器/解码器
文件页数: 41/83页
文件大小: 734K
代理商: MAS3587F
ADVANCE INFORMATION
MAS 3587F
Micronas
41
3.3.5. DSP Volume Control
The digital baseband volume matrix is used for control-
ling the digital gain of the decoder as shown in Fig. 3
3. This volume control is effective on both, the digital
audio output and the data stream to the D/A convert-
ers. The values are in 20-bit 2
s complement notation.
Table 3
9 shows the proposed settings for the 4 vol-
ume matrix coefficients for stereo, left and right mono.
The gain factors are given in fixed point notation
(
1.0
×
2
19
= 80000
hex
).
The DSP volume control is available in Decoder Mode
only.
Fig. 3
3:
Digital volume matrix
If channels are mixed, care must be taken to prevent
clipping at high amplitudes. Therefore the sum of the
absolute values of coefficients for one output channel
should be less than 1.0.
For normal operating conditions it is recommended to
use the main volume control of the audio codec
instead (register 00 10
hex
of the audio codec).
1
1
1
1
LL
LR
RL
RR
+
+
left audio
right audio
f
t
Table 3
9:
Settings for the digital volume matrix
Memory
D0:354
D0:355
D0:356
D0:357
Name
LL
LR
RL
RR
Stereo
(default)
1.0
0
0
1.0
Mono left
1.0
1.0
0
0
Mono right
0
0
1.0
1.0
Table 3
10:
Content of D0:fd5 after reception of 19 ancillary bits.
D0:fd5
MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
Ancillary
Data
4th
bit
5th
bit
6th
bit
...
...
...
...
...
...
...
...
...
...
17th
bit
18th
bit
last
bit
Table 3
11:
Content of D0:fd6 after reception of 19 ancillary bits.
D0:fd6
MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
Ancillary
Data
x
x
x
x
x
x
x
x
x
x
x
x
x
first
bit
2nd
bit
3rd
bit
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