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STA015 数据表(PDF) 30 Page - STMicroelectronics

部件名 STA015
功能描述  MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM CAPABILITY
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA015 数据表(HTML) 30 Page - STMicroelectronics

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5. GENERAL INFORMATION
TONE_ATTEN
Address: 0x7D (125)
Type: RW
Software Reset: 0x00
Hardware Reset: 0x00
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
TA7
TA6
TA5
TA4
TA3
TA2
TA1
TA0
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
Attenuationstep of 1.5dB.
MSB
LSB
ATTENUATION
b7
b6
b5
b4
b3
b2
b1
b0
-1.5dB step
0
00000
00
0dB
0
00000
01
-1.5dB
0
00010
10
-3dB
0
00000
11
-4.5dB
.
.
.
0
0
0
0
1
0
1
0
-15dB
0
0
0
0
1
0
1
1
-16.5dB
0
0
0
0
1
1
0
0
-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.
Table2: MPEG Layer III Frames Time Duration
Sampling Frequency (KHz)
48
44.1
32
24
22.5
16
12
11.025
8
MPEG Frame Lenght (ms)
24
29
36
24
29
36
48
48
72
STA015-STA015B-STA015T
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