STA015T datasheet(26/55 Pages) STMICROELECTRONICS

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STA015 STA015B STA015T

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Mode extension

These bits are used in joint stereo mode. They indicates which type of joint stereo coding method is ap-

plied. The frequency ranges, over which the intensity_stereo and ms_stereo modes are applied, are im-

plicit 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.

DLA

Address: 0x46 (70)

Type: R/W

Software Reset: 0x00

Hardware Reset: 0x00

DLA register is used to attenuate the level of audio output at the Left Channel using the butterfly shown in

Fig. 18. When the register is set to 255 (0xFF), the maximum attenuation is achieved.

A decimal unit correspond to an attenuation step of 1 dB.

Figure 18. Volume Control and Output Setup

emphasis

emphasis specified

’00’

none

’01’

50/15 microseconds

’10’

reserved

’11’

CCITT J, 17

MSB

LSB

Description

DLA7

DLA6

DLA5

DLA4

DLA3

DLA2

DLA1

DLA0

OUTPUT ATTENUATION

000

NO ATTENUATION

000

-1dB

000

-2dB

:::

110

-96dB

DLA

Output Left Channel

DSP Left Channel

DLB

DRA

Output Right Channel

DSP Right Channel

DRB

D97AU667

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