STA013 datasheet(17/38 Pages) STMICROELECTRONICS

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The meaning of the flags are shown in the follow-

ing tables:

MPEG IDs

IDex

MPEG 2.5

reserved

MPEG 2

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

ID = 1

ID = 0

’0000’

free

’0001’

’0010’

’0011’

’0100’

’0101’

’0110’

’0111’

’1000’

112

’1001’

128

’1010’

160

’1011’

192

112

’1100’

224

128

’1101’

256

144

’1110’

320

160

’1111’

forbidden

Sampling Frequency

indicates the sampling frequency of the encoded

audio signal (KHz) depending on the MPEG ID

Sampling

Frequency

MPEG1

MPEG2

MPEG2.5

’00’

44.1

22.05

11.03

’01’

’10’

’11’

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

mode specified

’00’

stereo

’01’

joint stereo (intensity_stereo and/or ms_stereo)

’10’

dual_channel

’11’

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.

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

emphasis specified

’00’

none

’01’

50/15 microseconds

’10’

reserved

’11’

CCITT J,17

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