| 摘要 |
The present invention relates to methods and arrangements to enhance transmission quality in a Push-to-Talk system comprising a sending mobile unit MB 1 , and a receiving mobile unit MB 2 used by a receiving subscriber B. The receiving unit MB 2 comprises a Play-Out-Buffer POB and a Repeat Buffer RB, whereby a stream of sequences 15 - 19,25 - 29,35 - 39 is sent from the sending unit MB 1 to the receiving unit MB 2 . The method comprises the following steps: -The incoming stream of sequences 15 - 19,25 - 29,35 - 39 is collected into the Repeat Buffer RB and into the Play-Out-Buffer POB. The Play-Out-Buffer has a storage size and a point for commencing play-out that provides low voice delay, and the Repeat Buffer has a storage size that provides high sound quality. -The incoming stream is played-out from the Play-Out-Buffer POB to the receiving subscriber B. -Replay is commenced of a defined part 36 - 39 of the sequences 15 - 19,25 - 29,35 - 39 collected in the Repeat Buffer RB.
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