High speed data syntax parsing apparatus

Details High speed data syntax parsing apparatus High speed data syntax parsing apparatus

1997-02-10

1998-09-22

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 61, 341 50, 341 95, 341106, H03M 740

Patent

active

058120742

ABSTRACT:
A syntax parsing apparatus produces an effective bit length used in a video decoder which decodes encoded bitstream data. The syntax parsing apparatus includes an input port for receiving encoded bitstream data, and a control command output port for storing data of a plurality of control commands and sequentially selects and outputs the data of each of the plurality of the control commands. A variable-length code table unit selects and outputs either the bitstream data received via the input port or a variable-length code corresponding to the received bitstream data according to the control command data supplied from the control command output port, and outputs a variable-length code length corresponding to the received bitstream data. A data store stores the selected data output from the variable-length code table unit in response to the control command data. A condition signal generator generates a condition signal representing whether the bitstream data received via the input port is additional information, using the selected data stored in the data store and the bitstream data received via the input port. An effective length output portion receives the selected data stored in the data store and the variable-length code length output from the variable-length code table unit, determines an effective bit length corresponding to next bitstream data to be received via the input port, according to the determined control command data and the condition signal, and outputs the determined result.

REFERENCES:
patent: 5566089 (1996-10-01), Hoogenboom

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