公开(公告)号：US5940479A

公开(公告)日：1999-08-17

申请号：US724655

申请日：1996-10-01

申请人： Kenneth R. Guy ,  Jaswant R. Jain ,  Ishwar V. Jasuja ,  Michael W. Johnson ,  Albert Juandy ,  Simon S. Lam ,  Anthony Y. Lee ,  David Misunas ,  Jacques A. Roth

发明人： Kenneth R. Guy ,  Jaswant R. Jain ,  Ishwar V. Jasuja ,  Michael W. Johnson ,  Albert Juandy ,  Simon S. Lam ,  Anthony Y. Lee ,  David Misunas ,  Jacques A. Roth

IPC分类号： H03M13/00 ,  H04L29/06 ,  H04M7/00 ,  H04M11/00 ,  H04J3/12 ,  H04L12/28

CPC分类号： H04L65/605 ,  H03M13/00 ,  H04L29/06027 ,  H04L65/103 ,  H04L65/104 ,  H04L65/1069 ,  H04M7/1205

摘要： A system and method for transmitting aural signals across a wide area network (WAN) from a local phone coupled to a computer, e.g., a PC-phone, to a remote phone coupled to a KTS, PBX, or PSTN, for example. This capability is provided by the gateway unit of the present invention. The system of the present invention is quickly installed in a server or a personal computer coupled to a local area network. The system is connected to one or more of a PSTN, a private branch exchange, a key telephone system, a telephone, a facsimile machine, and a modem. In the case of voice transmission, a gateway unit translates received telephony signal into a format that is compatible with the telephone system or equipment connected thereto. The present invention can provide a voice quality that approaches, equals, or exceeds the voice quality of conventional telephone switched networks. This high voice quality is achieved by utilizing a high quality voice digitization algorithm on both the PC-phone and the gateway, by ensuring a low maximum network delay between the PC-phone and the gateway, by permitting a dynamic compensation for variations in network delay, and by utilizing a forward error correction technique for transmission over WANs that can recreate lost or delayed signals in a manner that recreates the signal so the lost signal is typically not detectable by a user.

摘要翻译： 例如，用于从耦合到诸如PC电话的计算机的本地电话到广域网（WAN）发送听觉信号到例如耦合到KTS，PBX或PSTN的远程电话的系统和方法。 该能力由本发明的网关单元提供。 本发明的系统被快速地安装在耦合到局域网的服务器或个人计算机中。 该系统连接到PSTN，私人交换机，密钥电话系统，电话机，传真机和调制解调器中的一个或多个。 在语音传输的情况下，网关单元将接收到的电话信号转换成与电话系统或与其连接的设备兼容的格式。 本发明可以提供接近，等于或超过常规电话交换网络的语音质量的语音质量。 通过在PC电话和网关上使用高质量的语音数字化算法，通过确保PC电话和网关之间的最小网络延迟，通过允许动态补偿网络延迟的变化来实现这种高的语音质量 并且通过利用前向纠错技术在广域网上进行传输，该技术可以以重建信号的方式再现丢失或延迟的信号，使得丢失的信号通常不被用户检测到。

公开(公告)号：US06298057B1

公开(公告)日：2001-10-02

申请号：US08634927

申请日：1996-04-19

申请人： Kenneth R. Guy ,  Jaswant R. Jain ,  Ishwar V. Jasuja ,  Michael W. Johnson ,  Albert Juandy ,  Simon S. Lam ,  Anthony Y. Lee ,  David Misunas ,  Jacques A. Roth

发明人： Kenneth R. Guy ,  Jaswant R. Jain ,  Ishwar V. Jasuja ,  Michael W. Johnson ,  Albert Juandy ,  Simon S. Lam ,  Anthony Y. Lee ,  David Misunas ,  Jacques A. Roth

IPC分类号： H04L1228

CPC分类号： H04L12/2854 ,  H04J3/0632 ,  H04L1/0002 ,  H04L1/004 ,  H04M7/006 ,  Y02D50/10

摘要： A system and method for transparently transmitting aural signals across a wide area network (WAN). The system of present invention is connected to one or more of a private branch exchange, a key telephone system, a telephone, a facsimile machine, and a modem, for example. In the case of voice transmission, a user places a telephone call using the same procedure that is used when placing a telephone call over a conventional public switched network. The aural signals are translated into a format that is compatible with the local area network (LAN) and the translated signals are transmitted to a router or a switch that connects the LAN to the WAN. The data is transmitted across the WAN to a router or switch coupled to a second LAN. The data is then sent to a destination central site unit or PC which translates the signal into a format that is compatible with the telephone system connected thereto. The present invention provides a voice quality that approaches, equals, or exceeds the voice quality of conventional telephone switched networks. This high voice quality is achieved by utilizing a high quality voice digitization algorithm, by ensuring a low maximum network delay, by dynamically compensating for variations in network delay, and by using a forward error correction technique that can recreate lost or delayed signals in a manner that recreates the signal so the lost signal is typically not detectable by a user.

摘要翻译： 一种用于在广域网（WAN）上透明传输听觉信号的系统和方法。 本发明的系统例如连接到私人交换机，密钥电话系统，电话，传真机和调制解调器中的一个或多个。 在语音传输的情况下，用户使用与在常规公共交换网络上进行电话呼叫时所使用的相同的过程进行电话呼叫。 听觉信号被转换为与局域网（LAN）兼容的格式，并且转换的信号被传送到路由器或将LAN连接到WAN的交换机。 数据通过WAN传输到耦合到第二LAN的路由器或交换机。 然后将数据发送到目的地中心站点单元或PC，其将信号转换为与连接到其的电话系统兼容的格式。 本发明提供接近，等于或超过常规电话交换网络的语音质量的语音质量。 通过使用高质量的语音数字化算法，通过确保低的最大网络延迟，通过动态地补偿网络延迟的变化以及通过使用可以以一种方式重现丢失或延迟的信号的前向纠错技术来实现这种高的语音质量 这会重建信号，使得丢失的信号通常不被用户检测到。