Patent ID: 7200562

Claim:
A multimedia data decoder for decoding a bit stream of coded multimedia data according to a predetermined standard, comprising: a decoding section having a function to detect a synchronous word from the bit stream, analyze decoding information following the synchronous word and extract specific option designating information from the decoding information in order to decode coded data in the bit stream; and a control section for controlling the decoding section so that, if the extracted option designating information has any out-of-standard data, that is, any value that is not defined by the standard, the decoding section replaces the out-of-standard value with a value defined by the standard and conducts a decoding process, wherein the option designating information is bit rate index information in an audio bit stream, and the control section has a function to conduct a control operation so as to calculate a bit rate based on sampling frequency information in the decoding information and the number of bits in the coded data up to a following synchronous word and replace the out-of-standard value with a value indicating the calculated bit rate.