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參數(shù)資料
| 型號： | STA003 |
| 英文描述： | MPEG 2.5 LAYER III AUDIO DECODER |
| 中文描述： | 2.5第三層的MPEG音頻解碼器 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大小： | 299K |
| 代理商： | STA003 |
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TONE_ATTEN
Address: 0x7D
Type: RW
Software Reset: 0x00
Hardware Reset: 0x00
MSB
b7
TA7
LSB
b0
TA0
b6
TA6
b5
TA5
b4
TA4
b3
TA3
b2
TA2
b1
TA1
In the digital output audio, the full signal is
achieved with 0 dB of attenuation. For this rea-
son, before applying Bass & Treble Control, the
user has to set the TONE_ATTEN register to the
maximum value of enhancement is going to per-
form.
For example, in case of a 0 dB signal (max. level)
only attenuation would be possible. If enhance-
ment is desired, the signal has to be attenuated
accordingly before in order to reserve a margin in dB.
An increment of a decimal unit corresponds to a Tone
Attenuation step of 1.5dB.
MSB
b7
0
0
0
0
LSB
b0
0
1
0
1
.
.
.
ATTENUATION
-1.5dB step
0dB
-1.5dB
-3dB
-4.5dB
b6
0
0
0
0
b5
0
0
0
0
b4
0
0
0
0
b3
0
0
1
0
b2
0
0
0
0
b1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
1
1
1
0
0
1
0
-15dB
-16.5dB
-18dB
DEMULTIPLEXING
&
ERROR CHECK
HUFFMAN
DECODING
D98AU903
INVERSE
QUANTISATION
&
DESCALING
SIDE INFORMATION
DECODING
INVERSE
FILTERBANK
IMDCT
STEREOPHONIC AUDIO
SIGNAL (2*768Kbit/s)
ENCODED AUDIO
BITSTREAM (8Kbit/s ... 128Kbit/s)
ANCILLARY DATA
5.1. MPEG 2.5 Layer III Algorithm.
5.2 - MPEG Ancillary Data Description:
As specifyed in the ISO standard, the MPEG
Layer III frames have a variable bit lenght, and
are constant in time depending on the audio sam-
pling frequencies. The time duration of the Layer
III frames is shown in Tab 2.
5. GENERAL INFORMATION
Table2:
MPEG Layer III Frames Time Duration
Sampling Frequency (KHz)
MPEG Frame Lenght (ms)
48
24
32
36
24
24
16
36
12
48
8
72
STA003T
26/32
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