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STA310 数据表(PDF) 69 Page - STMicroelectronics |
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STA310 数据表(HTML) 69 Page - STMicroelectronics |
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69 / 90 page  69/90 STA310 Description: MP_DOWNMIX MPEG downmix 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. 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). 7654321 0 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, RS) LO = L, RO = R, CO = C, LsO = 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 capable: V1 ON, V2 ON Lk = L + 0.707 A1 + 0.707 G, Rk = R + 0.707 A2 + 0.707 G 0x0B 2/0 Karaoke Capable: V1 ON, V2 OFF Lk = L + 0.707 A1 + 0.707 G, Rk = R + 0.707 G 0x0C 2/0 Karaoke Capable: V1 OFF, V2 ON Lk = L + 0.707 G, Rk = R + 0.707 A2 + 0.707 G 0x0D 2/0 Karaoke Capable: V1 OFF, V2 OFF Lk = L + 0.707 G, Rk = R + 0.707 G 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 Capable: V1 OFF, V2 ON (Dolby Digital like) Lk = L + 0.707 A2 + 0.707 G, Rk = R + 0.707 A2 + 0.707 G 0x1A 3/0 Karaoke Capable: V1 ON, V2 ON Lk = L + 0.707 A1, Ck = G, Rk = R + 0.707 A2 |
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