Data encoder for producing and storing info runlength value, bit

Details Data encoder for producing and storing info runlength value, bit Data encoder for producing and storing info runlength value, bit

1992-09-25

1994-06-14

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 67, H03M 746

Patent

active

053213971

ABSTRACT:
A data encoder is described for carrying out runlength coding. A count of zero input data values is made by a runlength counter 10. The input data values are simultaneously fed to a encoded word bit length indicator 6 and encoded word generator 8 which respectively produced outputs for each input data value. An encoder state machine 12 triggers the reading into an encoder data store 16 of the current runlength, encoded word bit length and encoded word at appropriate times. The encoder state machine triggers storage when a non-zero input data value is received. The encoder state machine 12 also prompts the generation and storage of continuation codes (corresponding to a predetermined maximum of zero input data values) and end of block codes (corresponding to an indication that all the subsequent input data values within a current block are zero values and can therefore be ignored) when appropriate data streams are encountered.

REFERENCES:
patent: 4968135 (1990-11-01), Wallace et al.

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