| 摘要 |
<p>PURPOSE:To suppress the reduction in reproduced sound quality of a voice packet by transmitting a voice data frame approximate to a normal sound data frame when a voice data frame received by a communication controller is detected for an error. CONSTITUTION:The voice data frame is received to a reception controller and a flag check sequence FCS error check means 51 detects that a data frame is normal, an approximate frame revising means 53 revises an approximate frame in a table of a call corresponding management means 54 together with a timer value of a timer 52 at that point of time and the frame is outputted as a normal frame 81 at the same time. When an FCS error is detected by the means 51, a corresponding voice data frame is referenced by an approximate frame reference means 55 from the table of the means 54, and the timer value at the FCS error detection is compared with the timer value in the referenced means 54 by a timer value comparison means 56, the reference frame is used as an approximate frame 82 depending whether the difference is within the set value or exceeds the value, or transmitted as an FCS error frame 83.</p> |
