Test bit-stream generator and method for decoders

Data processing: measuring – calibrating – or testing – Testing system – Of circuit

Reexamination Certificate

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Details

C702S179000, C706S016000, C706S021000, C706S050000, C703S002000, C370S506000, C370S504000

Reexamination Certificate

active

07076392

ABSTRACT:
The present invention provides a test bitstream generator and method for generating test bitstreams to test a bitstream decoder that is arranged to decode bitstreams generated in accordance with a predefined syntax. The method comprises the steps of generating test code from the syntax, the test code being arranged when executed to generate a test bitstream dependent on values assigned to a plurality of variables, each variable having a number of interesting values. The method then involves executing the test code, including the step of, for each of said variables, assigning that variable one of its interesting values, in order to thereby generate a test bitstream dependent on the interesting value assigned to each variable. It has been found that this technique provides an automated process for extensively testing a bitstream decoder.

REFERENCES:
patent: 5706002 (1998-01-01), Meehan et al.
patent: 5731839 (1998-03-01), Panaro
patent: 6400400 (2002-06-01), Isnardi et al.
patent: 6510247 (2003-01-01), Ordentlich et al.
Settle et al., Digital Bit Stream Generator for Testing MPEG Video Decoders, Jun. 10, 1996, vol. 42, pp. 422-430.
CRC, ‘MPEG-4 Video Standard, Content-Based Video Coding’, 2000 CRC press, pp. 1-26.

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