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1. 发明授权

US5737331A Method and apparatus for conveying audio signals using digital packets 失效
标题翻译：使用数字包传送音频信号的方法和装置
公开(公告)号：US5737331A
公开(公告)日：1998-04-07
申请号：US529812
申请日：1995-09-18
申请人： Thomas Jake Hoppal , Peter Joseph Armbruster , James William Bishop, Jr. , Johanna Wild
发明人： Thomas Jake Hoppal , Peter Joseph Armbruster , James William Bishop, Jr. , Johanna Wild
IPC分类号： H04J3/12 , H04M3/42
CPC分类号： H04M7/1295
摘要： A digital telecommunication network (10) provides an audio processor (56) for each call in each external node (14). The audio processor (56) includes a vocoder and additional functions. At a source external node (14), the audio processor (56) detects DTMF events and encodes the events in a call-related signalling packet (26) which conveys a history of all DTMF activity at the source node over the past several seconds. In addition, the source node detects silence and configures a call-related signalling packet (26) to instruct a destination node (14) how to synthesize comfort noise. Speech is encoded as vocoded voice packets rather than call-related signalling packets. At a destination external node, the node's audio processor (56) distinguishes call-related signalling from vocoded voice. The audio processor (56) synthesizes voice, comfort noise, DTMF signals, and other signals in response to the call-related signalling packets and vocoded voice packets.
摘要翻译：数字电信网络（10）为每个外部节点（14）中的每个呼叫提供音频处理器（56）。音频处理器（56）包括声码器和附加功能。在源外部节点（14）处，音频处理器（56）检测DTMF事件并对呼叫相关的信令分组（26）中的事件进行编码，该分组在过去几秒内传送源节点上的所有DTMF活动的历史记录。此外，源节点检测到静音并配置呼叫相关信令分组（26）以指示目的地节点（14）如何合成舒适噪声。语音被编码为声音语音分组而不是呼叫相关的信令分组。在目的地外部节点处，节点的音频处理器（56）将呼叫相关的信令与语音编码的语音区分开。音频处理器（56）响应于呼叫相关的信令分组和声码分组合成语音，舒适噪声，DTMF信号和其他信号。

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