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AD1892 데이터시트(PDF) 9 Page - Analog Devices |
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AD1892 데이터시트(HTML) 9 Page - Analog Devices |
9 / 24 page AD1892 REV. 0 –9– As noted above, the Channel Status bit from each subframe accumulates over a 192 subframe period. The standards allow for the Channel Status bit in each subframe to be independent, but ordinarily the Channel Status bit in the two subframes of each frame are the same. The Channel Status bits are defined VALIDITY USER DATA CHANNEL STATUS DATA EVEN PARITY BIT MSB AUDIO DATA V U C P 27 28 29 30 31 LSB AUX DATA PREAMBLE 8 7 4 3 0 A0 B0 A1 B1 A2 B2 (EXPANDED) A = LEFT CHANNEL B = RIGHT CHANNEL (EXPANDED) A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A188 B188 A189 B189 A190 B190 A191 B191 SUBFRAME FRAME CHANNEL STATUS BLOCK (384 AUDIO SAMPLES) 192 LEFT, 192 RIGHT Figure 5. Block, Frame and Subframe Organization RESERVED 7 EMPHASIS AUDIO PRO = 0 BYTE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 7 15 23 31 39 191 BLOCK BIT 6 5 4 3 2 1 BIT 0 CATEGORY CODE SOURCE NUMBER RESERVED FS MODE COPY L CHANNEL NUMBER CLOCK ACCURACY Figure 6. Consumer Channel Status Block Structure differently for the consumer audio standards and the profes- sional audio standards. The 192 Channel Status bits are organized into 24 bytes and have the interpretations shown in Figures 6 through 16. 7 EMPHASIS LOCK FS AUDIO PRO = 1 BYTE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 7 15 23 31 39 47 55 87 119 151 183 191 BLOCK BIT 6 5 4 3 2 1 BIT 0 CHANNEL MODE USER BIT MANAGEMENT RESERVED WORD LENGTH AUX USE RESERVED RESERVED REFERENCE RESERVED ALPHANUMERIC CHANNEL ORIGIN DATA ALPHANUMERIC CHANNEL DESTINATION DATA LOCAL SAMPLE ADDRESS CODE (32-BIT BINARY) TIME OF DAY CODE (32-BIT BINARY) RESERVED RELIABILITY FLAGS CYCLIC REDUNDANCY CHECK CHARACTER Figure 7. Professional Channel Status Block Structure |
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