| 摘要 |
<p>PROBLEM TO BE SOLVED: To quickly recover missing data even on the occurrence of missing of midway data. SOLUTION: An FIFO controller 12 receives audio data via a USB controller 11 and an FIFO 14 sequentially stores the data on the basis of synchronous control by a PLL 13. The data read from the FIFO 14 are given to a P/ S.format conversion section 15, which applies parallel/serial conversion to the data and converts the format of the data into an audio format, a D/A converter 16 receiving the data converts the data into an analog audio output signal and provides an output. The P/S.format conversion section 15 conducts forcible synchronization on the basis of a synchronous flag. An A/D converter 18 converts an analog audio signal from a microphone 4 or the like into digital data, an S/P.format conversion section 19 applies serial/parallel conversion to the digital data and converts the format of the digital data into a USB format, adds a synchronous flag to the data, which are sequentially stored in an FIFO 20. Thus, synchronization on the occurrence of a missing bit is facilitated.</p> |
