STA310 datasheet(22/90 Pages) STMICROELECTRONICS

22 / 90 page

STA310

22/90

4.6.5 MLP

MLP is a lossless coding system for use on digital audio data originally represented as linear PCM. MLP is man-

datory in DVD Audio. It allows transmission and storage of up to 6 channels. each up to 24 bits precision and

with sample rates between 44.1 KHz and 192KHz.

- DECODESEL = 8

4.6.6 CDDA

- DECODESEL = 5

4.6.7 Beep Tone

- DECODESEL = 7

4.6.8 Pink noise generator

The pink noise generator can be used to position the speakers in the listening room so to benefit of the best

listening conditions.

The decoder must be programmed so to generate pink noise by writing 4 in the DECODESEL register. The

DOWNMIX register is used to select independently the channels on which the pink noise will be output.

When generating pink noise, the output configuration should be: OCFG=0 and PCM_SCALE=0.

Figure 13. Pink Noise Generator Flow

4.7 Post Processing

The following post processing alghorithms are available

4.7.1 Prologic

Pro Logic Compatible Downmix

The STA310 can decode an AC-3 multichannel bitstream and encode it to provide a 2-channel Pro Logic com-

patible output (Lt, Rt). These 2 channels are the result of a specific downmix referred to as Pro Logic compatible.

This downmix is selected by the register DOWNMIX. The 2 channels can be used as the input of a Pro Logic

decoder and player (e.g. home theatre).

Pro Logic Decoding

The STA310 can decode a 2-channel Pro Logic bitstream. The 2 channels could come from a CD player, an

AC-3 2-channel bitstream or an MPEG1 bitstream. The 2-channel bitstream can be converted into a 4-channel

output (L, R, C, S). The surround (S) is simultaneously sent on Ls and Rs channels. A Pro Logic downmix en-

Pink

Noise

LFe

STA310 数据表(PDF) 22 Page - STMicroelectronics