STA003T View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA003T' PDF : 32 Pages View PDF
STA003T
The meaning of the flags are shown in the follow-
ing tables:
MPEG IDs
IDex
0
0
1
1
ID
0
MPEG 2.5
1
reserved
0
MPEG 2
1
MPEG 1
Layer
in Layer III these two flags must be set always to
"01".
Protection_bit
It equals "1" if no redundancy has been added
and "0" if redundancy has been added.
Bitrate_index
indicates the bitrate (Kbit/sec) depending on the
MPEG ID.
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
not supported
not supported
not supported
not supported
not supported
forbidden
ID = 0
free
8
16
24
32
40
48
56
64
80
96
112
128
not supported
not supported
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
MPEG2 MPEG2.5
not supported not supported not supported
48
24
12
32
16
8
reserved reserved reserved
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’.
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
’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.
emphasis
’00’
’01’
’10’
’11’
emphasis specified
none
50/15 microseconds
reserved
CCITT J,17
16/32
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