STA310 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA310' PDF : 90 Pages View PDF
STA310
Description:
Bitfield
Description
MC
When MC=1, the multi-channel part of the
bitstream is not decoded, only the MPEG-1
compatible bitstream is decoded. Bit MC must
be set to 1 for an MPEG-1 bitstream.
DEN
De-normalization: set DEN=0 for MPEG1
signals, and set DEN=1 for MPEG2 multi-
channel signals
When DEN=1, MPEG2 multi-channel signals
L, C, R, LS and RS can be de-normalized.
The signals must first be inverse-weighted
then multiplied by the de-normalization factor.
This undoes the attenuation carried out at the
encoder side to avoid overload when
calculating the compatible signals (see MPEG
13818-3 specifications).
MP_DOWNMIX
MPEG downmix
7
6
5
4
3
2
1
0
Address: 0x6F
Type: R/W
Software Reset: 0x08
Hardware Reset: UND
Description:
In the table below, LO, RO, CO, LsO, RsO represent
the output channels after downmix, and L, R, C, LS,
RS are the audio channels.
The coefficients Kj, KC, Kr, KS, depend on the number
of input channels. In the above table, the equations
are given for a 5 channels input bitstream. If the input
bitstream does not contain five channels (L, C, R, LS,
RS), the coefficient “Kj” corresponding to the channel
not present is equal to 0.
If the MPEG bitstream contains only one surround
channel (S), replace (KS x (LS + RS)), (KS x LS and
(KS x RS) by (KS x S) in the above equations.
Value Output Mode
Comment
0x00 1/0 (C) = Mono CO = Kj x L + C + Kr x R + KS
(LS + RS)
0x01 2/0 (L, R) =
Stereo
LO = (L + KC x C + KS x LS)/
(1 + KC + KS),
RO = (R + KC x C + KS x RS)/
(1 + KC + KS)
0x02 3/0 (L, C, R)
LO = L + KS x LS, RO = R +
KS x RS, CO = C
0x03 2/1 (L, R, S)
LO = L + KC x C, RO = R + KC
x C, LsO = RsO = KS x (LS +
RS)
0x04 3/1 (L, C, R, S)
LO = L, RO = R, CO = C, LsO
= RsO = KS x (LS + RS)
0x05 2/2 (L, R, LS, RS) LO = L + KC x C, RO = R + KC
x C, LsO = LS, RsO = RS
0x06 3/2 (L, C, R, LS, LO = L, RO = R, CO = C, LsO
RS)
= LS, RsO = RS
0x09 2/0 (Dolby
surround LT, RT)
LT = (L + 0.707C - 0.707 x 0.5
(LS + RS)) /2.414,
RT = (R + 0.707C + 0.707 x
0.5 (LS + RS)) /2.414
0x0A 2/0 Karaoke
Lk = L + 0.707 A1 + 0.707 G,
capable: V1 ON, Rk = R + 0.707 A2 + 0.707 G
V2 ON
0x0B 2/0 Karaoke
Lk = L + 0.707 A1 + 0.707 G,
Capable: V1 ON, Rk = R + 0.707 G
V2 OFF
0x0C 2/0 Karaoke
Lk = L + 0.707 G, Rk = R +
Capable: V1 OFF, 0.707 A2 + 0.707 G
V2 ON
0x0D 2/0 Karaoke
Lk = L + 0.707 G, Rk = R +
Capable: V1 OFF, 0.707 G
V2 OFF
0x0E
2/0 Karaoke
Capable: V1 ON,
V2 OFF (Dolby
Digital like)
Lk = L + 0.707 A1 + 0.707 G,
Rk = R + 0.707 A1 + 0.707 G
0x0F 2/0 Karaoke
Lk = L + 0.707 A2 + 0.707 G,
Capable: V1 OFF, Rk = R + 0.707 A2 + 0.707 G
V2 ON (Dolby
Digital like)
0x1A 3/0 Karaoke
Lk = L + 0.707 A1, Ck = G, Rk
Capable: V1 ON, = R + 0.707 A2
V2 ON
69/90
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