STA015 Datasheet, PDF (20/44 Pages) STMicroelectronics – MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM CAPABILITY

STA015-STA015B-STA015T
Bitrate_index
indicates the bitrate (Kbit/sec) depending on the
MPEG ID.
Private bit
Bit for private use. This bit will not be used in the
future by ISO/IEC.
bitrate index
’0000’
’0001’
’0010’
’0011’
’0100’
’0101’
’0110’
’0111’
’1000’
’1001’
’1010’
’1011’
’1100’
’1101’
’1110’
’1111’
ID = 1
free
32
40
48
56
64
80
96
112
128
160
192
224
256
320
forbidden
ID = 0
free
8
16
24
32
40
48
56
64
80
96
112
128
144
160
forbidden
Sampling Frequency
indicates the sampling frequency of the encoded
audio signal (KHz) depending on the MPEG ID
Sampling
Frequency
’00’
’01’
’10’
’11’
MPEG1
44.1
48
32
reserved
MPEG2
22.05
24
16
reserved
MPEG2.5
11.03
12
8
reserved
Mode
Indicates the mode according to the following ta-
ble. The joint stereo mode is intensity_stereo
and/or ms_stereo.
mode
’00’
’01’
’10’
’11’
mode specified
stereo
joint stereo (intensity_stereo and/or ms_stereo)
dual_channel
single_channel (mono)
Mode extension
These bits are used in joint stereo mode. They in-
dicates which type of joint stereo coding method
is applied. The frequency ranges, over which the
intensity_stereo and ms_stereo modes are ap-
plied, are implicit in the algorithm.
Copyright
If this bit is equal to ’0’, there is no copyright on
the bitstream, ’1’ means copyright protected.
Original/Copy
This bit equals ’0’ if the bitstream is a copy, ’1’ if it
is original.
Emphasis
Indicates the type of de-emphasis that shall be
used.
Padding bit
if this bit equals ’1’, the frame contains an addi-
tional slot to adjust the mean bitrate to the sam-
pling frequency, otherwise this bit is set to ’0’.
emphasis
’00’
’01’
’10’
’11’
emphasis specified
none
50/15 microseconds
reserved
CCITT J,17
DLA
Address: 0x46 (70)
Type: R/W
Software Reset: 0x00
Hardware Reset: 0x00
MSB
b7
DLA7
0
0
0
:
0
b6
DLA6
0
0
0
:
1
b5
DLA5
0
0
0
:
1
b4
DLA4
0
0
0
:
0
b3
DLA3
0
0
0
:
0
b2
DLA2
0
0
0
:
0
b1
DLA1
0
0
1
:
0
LSB
b0
DLA0
0
1
0
:
0
Description
OUTPUT ATTENUATION
NO ATTENUATION
-1dB
-2dB
:
-96dB
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