sta014t STMicroelectronics, sta014t Datasheet - Page 20

• Manufacturer Part Number: sta014t
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm And Srs Wowo Postprocessing Capability
• Manufacturer: STMicroelectronics

STA014-STA014B-STA014T
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 addi-
tional slot to adjust the mean bitrate to the sam-
pling frequency, otherwise this bit is set to ’0’.
DLA
Address: 0x46 (70)
Type: R/W
Software Reset: 0x00
Hardware Reset: 0x00
20/45
Frequency
Sampling
DLA7
MSB
bitrate index
b7
0
0
0
0
:
’00’
’01’
’10’
’11’
’0000’
’0001’
’0010’
’0011’
’0100’
’0101’
’0110’
’0111’
’1000’
’1001’
’1010’
’1011’
’1100’
’1101’
’1110’
’1111’
DLA6
b6
0
0
0
1
:
reserved
MPEG1
44.1
48
32
DLA5
forbidden
b5
0
0
0
1
ID = 1
:
free
112
128
160
192
224
256
320
32
40
48
56
64
80
96
reserved
MPEG2
22.05
DLA4
24
16
b4
0
0
0
0
:
forbidden
DLA3
ID = 0
MPEG2.5
b3
free
reserved
112
128
144
160
0
0
0
0
16
24
32
40
48
56
64
80
96
:
8
11.03
12
8
DLA2
b2
0
0
0
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 ta-
ble. The joint stereo mode is intensity_stereo
and/or ms_stereo.
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.
mode
emphasis
DLA1
’00’
’01’
’10’
’11’
b1
0
0
1
0
’00’
’01’
’10’
’11’
:
stereo
joint stereo (intensity_stereo and/or ms_stereo)
dual_channel
single_channel (mono)
DLA0
LSB
none
50/15 microseconds
reserved
CCITT J,17
b0
0
1
0
0
:
mode specified
emphasis specified
OUTPUT ATTENUATION
NO ATTENUATION
Description
-96dB
-1dB
-2dB
: