STA310 datasheet(65/90 Pages) STMICROELECTRONICS

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STA310

coming vocal channels, V1 and V2.

An additional mode is added (

AC3_KARAMODE =

3) to allow multi-channel reproduction. In this case,

the downmix specified by the

AC3_DOWNMIX and

AC3_DUALMODE registers is applied.

The following table summaries the different modes:

Left = Output Channel,

Right = Output Channel, L, R, M, V1, V2 = Input

Channels (coded in Dolby Digital karaoke bitstream),

clev = Center Mix Level (value provided in the bit-

stream),

slev = Surround Mix Level (value provided in the bit-

stream). For further information ref. to annex C of

ATSC standard “Digital Audio Compression (AC-3)”.

AC3_DUALMODE

Dual downmix

Address: 0x6E

Type: R/W

Software Reset: NC

Hardware Reset: UND

Description

This register allows additional downmix to be set

when in 2/0 output mode or when receiving a “Dual

mode” incoming bitstream (example: A disk with 2 dif-

ferent languages on channel 1 and channel 2). In the

following table, channel 1 and 2 represent the output

channels

after

downmix

performed

with

AC3_DOWNMIX.

This

enables

Mono

downmix

when

AC3_DOWNMIX = 2 and

AC3_DUALMODE = 3.

AC3_DOWNMIX

Downmix

Address: 0x6F

Type: R/W

Software Reset: NC

Hardware Reset: UND

Description:.

Note: in notation, 3/2 represents 3 front speakers and

2 surround speakers.

AC3_STATUS0

Value

Mode

Comment

Aware Left = L + clev*M + slev*V1, Right = R +

clev*M + slev*V2

Not used

Multicha

nnel

Consider bitstream as multi-channel:

Perform downmix according to

DOWNMIX and DUALMODE registers

Capable Do not reproduce V1, V2: Left = L +

clev*M, Right = R + clev*M

Reproduction V1 only: Left = L + clev*M

+ 0.707*V1, Right = R + clev*M +

0.707V1

Reproduction V2 only: Left = L + clev*M

+ 0.707*V2, Right = R + clev*M +

0.707V2

Reproduction V1, V2: Left = L + clev*M

+ V1, Right = R + clev*M + V2

7654321

Value

Description

Output as Stereo

Output Channel 1 on both output L/R

Output Channel 2 on both output L/R

Mix Channel 1 and 2 to monophonic and

output on both L/R

7654321

Value

Description

2/0 Dolby Surround (LT, RT)

1/0 (C)

2/0 (L, R)

3/0 (L, C, R)

(L, R, S)

3/1 (L, C, R, S)

2/2 (L, R, LS, RS - Dolby Phantom Mode

3/2 (L, C, R, LS, RS)

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