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CMX608 数据表(PDF) 21 Page - CML Microcircuits |
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CMX608 数据表(HTML) 21 Page - CML Microcircuits |
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21 / 70 page  RALCWI Vocoder CMX608/CMX618/CMX638 2014 CML Microsystems Plc 21 D/608_18_38/11 2400bps A 20ms Vocoder frame consists of 48 bits. 24 bits are more sensitive and 24 bits are less sensitive. A single frame is transferred between the device and the host as 6 bytes. The table below shows the bit positions in the transferred bytes. The more sensitive bits are shown white on black. The byte at the top is the first out of the C-BUS for the encoder and the first into the C-BUS for the decoder. 7 6 5 4 3 2 1 0 B7 B6 B5 B4 B3 B2 B1 B0 B15 B14 B13 B12 B11 B10 B9 B8 B23 B22 B21 B20 B19 B18 B17 B16 B31 B30 B29 B28 B27 B26 B25 B24 B39 B38 B37 B36 B35 B34 B33 B32 B47 B46 B45 B44 B43 B42 B41 B40 There are no un-used bits in the packet. For multiple frame packets, each frame is 6 bytes and is read or written to the C-BUS in chronological order. 2750bps A 20ms Vocoder frame consists of 55 bits. 23 bits are more sensitive and 32 bits are less sensitive. A single frame is transferred between the device and the host as 7 bytes. The table below shows the bit positions in the transferred bytes. The more sensitive bits are shown white on black. The byte at the top is the first out of the C-BUS for the encoder and the first into the C-BUS for the decoder. 7 6 5 4 3 2 1 0 B7 B6 B5 B4 B3 B2 B1 B0 B15 B14 B13 B12 B11 B10 B9 B8 B23 B22 B21 B20 B19 B18 B17 B16 B31 B30 B29 B28 B27 B26 B25 B24 B39 B38 B37 B36 B35 B34 B33 B32 B47 B46 B45 B44 B43 B42 B41 B40 x B54 B53 B52 B51 B50 B49 B48 The most significant bit of the last byte is un-used. Its value is indeterminate. For multiple frame packets, each frame is 7 bytes (with 1 unused bit in the last byte) and is read or written to the C-BUS in chronological order. |
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