Decoding variable-length encoded signals

Details Decoding variable-length encoded signals Decoding variable-length encoded signals

1994-10-26

1996-12-31

DeBoer, Todd

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341106, 341 59, H03M 740

Patent

active

055898297

ABSTRACT:
Variable-length encoded signals (e.g., those corresponding to video signals) are decoded using a lookup table whose indices are shorter than the longest possible variable-length encoded signal. N bits from the encoded bit stream are used as the index to retrieve from the lookup table a table entry, which comprises a flag bit indicating whether the variable-length encoded signal is a short code signal or a long code signal, one or more code-length bits, and one or more code-value bits. If the flag bit indicates that the variable-length encoded signal is a short code signal, then the decoded signal is generated using the code-value bits, wherein the code-length bits indicate the length of the variable-length encoded signal. If the flag bit indicates that the variable-length encoded signal is a long code signal, then the decoded signal is generated using the code-value bits and one or more additional bits from the bit stream, wherein the code-length bits indicate the number of additional bits to be read from the bit stream to complete the variable-length encoded signal.

REFERENCES:
patent: 5046071 (1991-09-01), Tanoi
patent: 5138316 (1992-08-01), Konishi
patent: 5229863 (1993-07-01), Kao et al.
patent: 5267334 (1993-11-01), Normille et al.
patent: 5313298 (1994-05-01), Meeker
patent: 5333012 (1994-07-01), Singhal et al.
patent: 5381144 (1995-01-01), Wilson et al.
patent: 5504484 (1996-04-01), Wilson

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