From time to freq Converter
Compression Block:
ADPCM:
•Transient analysis
•Vector analysis
•Prediction analysis
Global Bit Management Variable Length Coding
Multiplexer
The six compressed channels are combined into a single line for ease of delivery. To do this each channel is stored into a register made up of flip- flops. A high speed Multiplexer removes the information at six times the
storage (sample) speed. | Multiplexer | |
Multiplexer |
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Six Channels | F/F type |
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N sample | Registers | 6 lines |
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frequency |
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Global Bit Management
Once compression has taken place, an examination of the six data streams for density is made. Bit groups are tagged and moved from a
0011100011000011111001010101 channel 1
0000001011000000000000000000 channel 3
Variable Length Coding
Common fixed length codes and no data (00000000) codes are removed and replaced with shorter codes using a look up table. These shorter length code replacements are flagged for decoding.
0100011111 |
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| ROM Table |
| 011 + flag |
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Packer
The packer organizes the information into blocks and adds:
·Error correction
·Synchronization information to each block and groups of blocks
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