| 摘要 |
The testing apparatus of the invention includes an MPEG encoder, a memory, an MPEG decoder, a comparator and a determiner. The MPEG encoder, which stores in advance grammar rules of MPEG Audio (encoding/decoding rules) to enable MPEG Audio encoding, outputs a bit string (stream) conforming to the MPEG Audio grammar rules in frame units. When a parameter (variable) or parameters of MPEG Audio are designated, the MPEG encoder prepares frames so that all possible values to be taken by each designated parameter are covered under the MPEG Audio encoding conditions, and continues outputting the frames until this is done for all of the designated parameters.
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