STA310 datasheet(20/90 Pages) STMICROELECTRONICS

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STA310

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4.6.1.3 Dual Mode

The Dual Mode corresponds to a mode where two completely independent mono program channels (e.g. bilin-

gual) are encoded in the bitstream, referenced to as channel 1 and channel 2.

The possible ways to output channels on left/right outputs are:

- Output channel 1 on both L/R outputs,

- Output channel 2 on both L/R outputs,

- Mix channels 1 and 2 to monophonic and output on both L/R,

- Output channel 1 on Left output, and channel 2 on Right output.

This channels downmix is specified in the register DUALMODE.

4.6.2 MPEG

The STA310 is able to decode MPEG-1 layerI and layerII encoded data, as well as MPEG-2 layer I, layer II data

without extension (i.e. 2-channel streams).

The MPEG input format should be specified in the DECODESEL register:

- DECODESEL=1 for MPEG1. The MC bit in MC_OFF register should be set.

- DECODESEL=2 for MPEG2. The MC bit in MC_OFF register should be set.

4.6.3 MP3

The STA310 is able to decoder MPEG2 layer III (MP3) data.

The MP3 input format aboved be specified in the DECODESEL register:

- DECODESEL=9 for MP3.

4.6.3.1 Dual Mode

The Dual Mode corresponds to a mode where two completely independent mono program channels (e.g. bilin-

gual) are encoded in the 2-channel incoming bitstream, referenced to as channel 1 and channel 2.

The audio decoder allows to:

- Output channel 1 on both L/R outputs,

- Output channel 2 on both L/R outputs,

- Mix channels 1 and 2 to monophonic and output on both L/R,

- Output channel 1 on Left output, and channel 2 on Right output.

The output configuration is chosen by special downmix for dual mode through register MPEG_DUAL.

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