| 摘要 |
PROBLEM TO BE SOLVED: To provide an encoder which enables real time processing of MPEG-II audio encoding process requiring a large amount of operation for a many kinds of works. SOLUTION: For audio data A/D converted by an A/D converting part 6 and stored in a memory 7 for units of a frame, high-speed Fourier transform FFT operation is performed for each channel by an FFT part 1, analysis filtering is performed by an analysis filtering part 2, the processing result is outputted to the memory 7 again, and psychological acoustic operation is performed from the processing result of the FFT part 1 by a processor core part 4. Then, a scale coefficient is calculated by the output of the analysis filtering part 2, and while using the result of this psychological acoustic operation, a final output bit string is outputted via a FIFO 8. In this case, processor efficiency is improved by utilizing an applied special processor for effectively executing the complicated algorithm, an FFT and an analysis filter engine are added, calculation ability is improved by forming a pipeline for each module to independently process routines, so that a system use degree is made maximal. |
