초록 ▼

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 p

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.

대표청구항 ▼

[ What is claimed is:] [1.] A method for transmitting aural signals across a wide area digital data network and a target phone system, comprising the steps of:receiving a first aural signal having a first configuration, said first aural signal representing a voice signal;converting said first aural

[ What is claimed is:] [1.] A method for transmitting aural signals across a wide area digital data network and a target phone system, comprising the steps of:receiving a first aural signal having a first configuration, said first aural signal representing a voice signal;converting said first aural signal into a first data signal having a first network configuration that can be transmitted through a first local area network including the steps of:converting said first aural signal to a digital signal;generating first and second data transmission unit signals, having said first network configuration, from said digital signal, said first data transmission unit signal includes:a first voice unit signal; anda correction unit signal including a representation of a second voice unit signal from a second data transmission unit signal, transmitted separately from a first data transmission unit signal, said correction unit signal for recreating said second data transmission unit signal if not received by said destination converter;wherein said first data signal represents said first data transmission unit signal;transmitting said first data signal to a first communication device through said first local area network;transmitting said first data signal from said first communication device to a second communication device in a second local area network through the wide area digital data network;transmitting said first data signal to a destination converter through said second local area network;converting said first data signal to a second data signal that is compatible with the target phone system; andtransmitting said second data signal from said destination converter to a first receiver via the target phone system;wherein said steps of receiving a first aural signal and converting said first aural signal are performed by a PC-phone.