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1.发明公开
公开(公告)号：EP0820052A2
公开(公告)日：1998-01-21
申请号：EP97105230.3
申请日：1997-03-27
IPC分类号： G10L9/00
CPC分类号： G10L19/173
摘要： In a voice coding-and-transmission system using a differential coding, a degradation of voice quality caused by a silent period transmission network and an ATM network is prevented without improving a silent-period elimination transmission network and existing transmission networks such as a STM network. In a relay node (104), an encoder (114) codes a voice signal from a decoder (108) again for a transient period immediately after a voice is started, and a transmission node (100) and a reception node (102) are tandem-connected. The encoder (114) and a decoder (122) at a reception node (102) are given respectively same reference values of a differential processing by memories (118, 128) when the voice is started, thereby preventing an abnormal sound generation due to a mismatch of inner statuses thereof when the voice is started. During the transient period, the internal statuses of an encoder (106) at a reception node (100) and the decoder (122) are closed each other. After the transient period is elapsed, switching a switch in a silent-period eliminator (112) to a digital-one-link, thereby preventing the degradation of the voice quality caused by quantization errors.
摘要翻译： 在使用差分编码的语音编码 - 传输系统中，防止由无声期传输网络和ATM网络引起的语音质量的恶化，而不改进静默期消除传输网络和诸如STM网络的现有传输网络 。 在中继节点（104）中，编码器（114）在语音开始之后立即对来自解码器（108）的语音信号再次进行瞬时编码，并且传输节点（100）和接收节点（102）是 串联连接。 当语音开始时，在接收节点（102）处的编码器（114）和解码器（122）分别给出由存储器（118,128）进行的差分处理的相同参考值，从而防止由于 当声音开始时，其内部状态不匹配。 在过渡期间，在接收节点（100）和解码器（122）处的编码器（106）的内部状态彼此关闭。 在经过了瞬时时段之后，将无声期消除器（112）中的开关切换到数字一链路，从而防止由量化误差引起的语音质量的劣化。
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公开(公告)号：EP0820052A3
公开(公告)日：2000-04-19
申请号：EP97105230.3
申请日：1997-03-27
CPC分类号： G10L19/173
摘要： In a voice coding-and-transmission system using a differential coding, a degradation of voice quality caused by a silent period transmission network and an ATM network is prevented without improving a silent-period elimination transmission network and existing transmission networks such as a STM network. In a relay node (104), an encoder (114) codes a voice signal from a decoder (108) again for a transient period immediately after a voice is started, and a transmission node (100) and a reception node (102) are tandem-connected. The encoder (114) and a decoder (122) at a reception node (102) are given respectively same reference values of a differential processing by memories (118, 128) when the voice is started, thereby preventing an abnormal sound generation due to a mismatch of inner statuses thereof when the voice is started. During the transient period, the internal statuses of an encoder (106) at a reception node (100) and the decoder (122) are closed each other. After the transient period is elapsed, switching a switch in a silent-period eliminator (112) to a digital-one-link, thereby preventing the degradation of the voice quality caused by quantization errors.
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