公开(公告)号：US09847846B2

公开(公告)日：2017-12-19

申请号：US14117248

申请日：2012-04-27

Applicant: John Gibbons ,  Robert Ming Lee ,  Graeme Peter Wilson ,  Finlay James Fraser ,  Sanjay Rugnath Vadgama

Inventor： John Gibbons ,  Robert Ming Lee ,  Graeme Peter Wilson ,  Finlay James Fraser ,  Sanjay Rugnath Vadgama

IPC: H04N21/43 ,  H04J3/06 ,  H04L12/835 ,  H04M7/00

CPC classification number: H04J3/0658 ,  H04J3/0632 ,  H04L47/30 ,  H04M7/006

Abstract: The audio outputs 29 of each of a plurality of telecommunications terminals in a packet switched system are synchronized by having each terminal transmit a stream of packets whose rate, and therefore duration is determined according to a clock generator 25, and is thus indicative of the rate at which the terminal is generating its audio output. The signals from each terminal are transmitted to a common server. For each terminal, the server uses a master dock to compare the duration of the packet stream with an expected duration, and calculates an offset value which is returned to the respective terminal. Each terminal stores the offset value it receives (20) and uses it to adjust the output of its clock generator 25 so that its operations can be synchronized to the server. This allows all the terminals' digital-to-analog conversion processes to be synchronized such that all their analog outputs are coordinated, allowing co-located acoustic outputs to be synchronous. A second embodiment maintains synchronization by maintaining the volume of the data buffer 23 serving the audio output 29 within predetermined limits.

公开(公告)号：US20150131649A1

公开(公告)日：2015-05-14

申请号：US14117248

申请日：2012-04-27

Applicant: John Gibbons ,  Robert Ming Lee ,  Graeme Peter Wilson ,  Finlay James Fraser ,  Sanjay Rugnath Vadgama

Inventor： John Gibbons ,  Robert Ming Lee ,  Graeme Peter Wilson ,  Finlay James Fraser ,  Sanjay Rugnath Vadgama

IPC: H04J3/06 ,  H04M7/00

CPC classification number: H04J3/0658 ,  H04J3/0632 ,  H04L47/30 ,  H04M7/006

Abstract: The audio outputs 29 of each of a plurality of telecommunications terminals in a packet switched system are synchronised by having each terminal transmit a stream of packets whose rate, and therefore duration is determined according to a clock generator 25, and is thus indicative of the rate at which the terminal is generating its audio output. The signals from each terminal are transmitted to a common server. For each terminal, the server uses a master dock to compare the duration of the packet stream with an expected duration, and calculates an offset value which is returned to the respective terminal. Each terminal stores the offset value it receives (20) and uses it to adjust the output of its clock generator 25 so that its operations can be synchronised to the server. This allows all the terminals' digital-to-analogue conversion processes to be synchronised such that all their analogue outputs are co-ordinated, allowing co-located acoustic outputs to be synchronous. A second embodiment maintains synchronisation by maintaining the volume of the data buffer 23 serving the audio output 29 within predetermined limits.

Abstract translation: 分组交换系统中的多个电信终端中的每一个的音频输出29通过使每个终端发送其速率流并因此根据时钟发生器25确定其持续时间的数据流来同步，并且因此指示速率 终端正在生成其音频输出。 来自每个终端的信号被发送到公共服务器。 对于每个终端，服务器使用主站以将分组流的持续时间与期望的持续时间进行比较，并计算返回给相应终端的偏移值。 每个终端存储其接收的偏移值（20），并使用它来调整其时钟发生器25的输出，使得其操作可以与服务器同步。 这允许所有端子的数模转换过程同步，使得所有的模拟输出都是协调的，允许同位置的声输出同步。 第二实施例通过将服务于音频输出29的数据缓冲器23的音量保持在预定限度内来维持同步。