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TAS5548DCAR Datasheet(PDF) 44 Page - Texas Instruments |
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TAS5548DCAR Datasheet(HTML) 44 Page - Texas Instruments |
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44 / 116 page  ( ) ( ) L 0.707 C 0.707 Ls 0.707 Rs L _ out 3.121 R 0.707 C 0.707 Ls 0.707 Rs R _ out 3.121 + ´ - ´ - ´ = + ´ - ´ - ´ = L _ out E3 L E4 C E7 Ls E8 Rs R _ out E3 R E4 C E5 Ls E6 Rs = ´ + ´ + ´ + ´ = ´ + ´ + ´ + ´ LEFT CH RIGHT CH CENTER CH RIGHT OUT SDIN1 COEF 0XE3 RS CH LS CH DOLBY DOWN MIX COEF 0XE4 COEF 0XE5 COEF 0XE6 COEF 0XE8 COEF 0XE7 SDIN4 SDIN2 LEFT OUT TAS5548 SLES270A – NOVEMBER 2012 – REVISED APRIL 2015 www.ti.com 7.4.18 Downmix Algorithm and I2S Out Figure 38. Dolby Downmix The TAS5548 has an excellent feature that can mix the input signals to create a downmix to make the I2S serial output which has an SRC that keeps output sample rate at 48KHz irrespective of input sample rate. Downmix registers are defined as follows: 0xE3 == Coefficient for L and R channels 0xE4 == Coefficient for Center channel 0xE5 == Coefficient for LS for R_out 0xE6 == Coefficient for Rs for R_out 0xE7 == Coefficient for Ls for L_out 0xE8 == Coefficient for Rs for L_out L, R, C, Ls, Rs are input cross bar mixer outputs. L, R, C, Ls, Rs are defined as the output of input mixers. L = Ch1, R = Ch2, C = Ch8, Ls = Ch3, Rs = Ch4, use input mixer to mix any other channels to I2S Out. (4) Input Mixers also can be used as other mixers to mix subwoofer channels to I2S out. By default I2S out has the following values: test (5) 7.4.19 Stereo Downmixes/(or Fold-Downs) 7.4.19.1 Left Total/Right Total (Lt/Rt) Lt/Rt is a downmix suitable for decoding with a Dolby Pro Logic upmixer to obtain 5.1 channels again. Lt/Rt is also suitable for stereophonic sound playback on a hi-fi or on headphones. 44 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: TAS5548 |
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