| 摘要 |
PURPOSE:To reduce the buffer size of the demodulation waveform data when the demodulation processing of the waveform data coexist in a process, etc., transferring the image data to a V-RAM at a fixed period. CONSTITUTION:A CPU 101 transfers the image data from an image data ROM 104 to the V-RAM 106 in a vertical blanking interval. On the other hand, a hard buffer 108 applies interruption to the CPU 101 when no sound waveform data to be outputted to a D/A converter 109 exist. The CPU 101 interrupts the processes while executing at present incorporating the image data transfer process, and transfers preferentially the oldest sound waveform data of 64 bytes in a soft buffer 113 to the hard buffer 108, and succeedingly writes the demodulated sound waveform data in the soft buffer 113 by executing a demodulation process to the ACOMP compression data in a sound waveform ROM 103. |
