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STA015 数据表(PDF) 25 Page - STMicroelectronics

部件名 STA015
功能描述  MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM CAPABILITY
PDF  56 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) 25 Page - STMicroelectronics

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STA015
Bitrate_index
indicates the bitrate (Kbit/sec) depending on the MPEG ID.
Sampling Frequency
indicates the sampling frequency of the encoded audio signal (KHz) depending on the MPEG ID
Padding bit
if this bit equals ’1’, the frame contains an additional slot to adjust the mean bitrate to the sampling fre-
quency, otherwise this bit is set to ’0’.
Private bit
Bit for private use. This bit will not be used in the future by ISO/IEC.
Mode
Indicates the mode according to the following table. The joint stereo mode is intensity_stereo and/or
ms_stereo.
bitrate index
ID = 1
ID = 0
’0000’
free
free
’0001’
32
8
’0010’
40
16
’0011’
48
24
’0100’
56
32
’0101’
64
40
’0110’
80
48
’0111’
96
56
’1000’
112
64
’1001’
128
80
’1010’
160
96
’1011’
192
112
’1100’
224
128
’1101’
256
144
’1110’
320
160
’1111’
forbidden
forbidden
Sampling Frequency
MPEG1
MPEG2
MPEG2.5
’00’
44.1
22.05
11.03
’01’
48
24
12
’10’
32
16
8
’11’
reserved
reserved
reserved
mode
mode specified
’00’
stereo
’01’
joint stereo (intensity_stereo and/or ms_stereo)
’10’
dual_channel
’11’
single_channel (mono)



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