A packet-based, hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable or mobile computing devices. The network accommodates real time voice transmission both through dedicated, scheduled bandwidth and through a packet-based routing within the confines and constraints of a data network. Conversion and call processing circuitry is also disclosed which enables access devices and personal computers to adapt voice information between analog voice stream and digital voice packet formats as proves necessary. Routing pathways include wireless spanning tree networks, wide area networks, telephone switching networks, internet, etc., in a manner virtually transparent to the user. A voice session and associate call setup simulates that of conventional telephone switching network, providing well-understood functionality common to any mobile, remote or stationary terminal, phone, computer, etc.

Hierarchical Data Collection Network Supporting Packetized Voice Communications Among Wireless Terminals and Telephones

In one aspect of the present invention, a network gateway is configured to facilitate on line and off line bi-directional communication between a number of near end data and telephony devices with far end data termination devices via a hybrid fiber coaxial network and a cable modem termination system. The described network gateway combines a QAM receiver, a transmitter, a DOCSIS MAC, a CPU, a voice and audio processor, an Ethernet MAC, and a USB controller to provide high performance and robust operation.

Gateway with voice

A Voice over Internet Protocol (VoIP) network is described in which session state is maintained in access switches, but not signaling gateways which maintain transaction state only during pendency of a related transaction. The signaling gateway further provides transparent inter-operation between the VoIP network and non-IP networks, such as the PSTN, by means of a translator which directly translates messages between the networks.

Voice over IP architecture

A method of discriminating voice, data, and facsimile calls communicated through a voice-over-packet network. The gateway is provided with software which can identify the existence of an answer signal (ANS) or a modified answer signal (ANSam) communicated between an answering modem and an originating modem over a packet network during a voice state call. The originating gateway can generate an ANS tone according to the protocols of the originating modem, using an originating-side gateway, when the existence of the ANS signal is identified by the receiving-side gateway. The originating gateway also generates an ANSam tone according to the protocols of the originating modem, using the originating-side gateway, when the existence of the ANSam signal is identified by the receiving-side gateway.

A Voice/Facsimile/Modem Call Discrimination Method For Voice Over Packet Networks

Methods and apparatus for generating an anti-noise signal and equalizing a reproduced audio signal (e.g., a far-end telephone signal) are described, wherein the generating and the equalizing are both based on information from an acoustic error signal.

Systems, methods, devices, apparatus, and computer program products for audio equalization

A signal processing system which discriminates between voice signals and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a call discriminator. The voice exchange is capable of exchanging voice signals between a switched circuit network and a packet based network. The signal processing system also includes a data exchange capable of exchanging data signals modulated by a voiceband carrier on the switched circuit network with unmodulated data signal packets on the packet based network. The data exchange is performed by demodulating data signals from the switched circuit network for transmission on the packet based network, and modulating data signal packets from the packet based network for transmission on the switched circuit network. The call discriminator is used to selectively enable the voice exchange and data exchange.

Voice and Data Exchange Over a Packet Based Network

Channel distortion and echo signals detrimentally affect data communication over a channel. The invention provides an echo cancellation modem for full-duplex communication which selects a modulation scheme prior to data communication, and requests changes to the level of modulation during data communication when channel quality has changed significantly. The modem includes an echo canceller (12, 14), a monitor (24) for determining the quality of the channel based on analysis of a residual echo component, and a controller (46) for selecting an acceptable modulation scheme based on the analysis by the monitor. The modem requests the remote device to operate at a selected rate, and operates at the selected rate only if the the remote device concurs. The modem uses a fall forward flag (68) to prevent contention between the modem and the remote device when the remote device cannot support a requested higher level modulation scheme. The modem includes re-initialization logic which selects appropriate monitor thresholds for coded and uncoded modulation options.

Adaptive rate control for echo cancelling modem

In modem apparatus having receiver circuitry which demodulates a received carrier into a sequence of received signals and decodes each signal into a signal point drawn from a predetermined signal point alphabet, the received carrier being modulated in accordance with a sequence of signal points representing a message, that improvement having circuitry for estimating the receipt of the end of the message by testing each received signal against a predetermined end-of-message condition.

Modem end of message detector

Voice and data exchange over a packet network

L'invention porte sur un systeme de traitement de signaux qui fait la distinction entre des signaux vocaux et des signaux numeriques modules par une porteuse bande vocale. Ce systeme de traitement de signaux comprend un central vocal, un central numerique et un discriminateur d'appels. Le central vocal est capable de commuter des signaux vocaux entre un reseau a commutation de circuit et un reseau a base de paquets. Le systeme de traitement de signaux comprend egalement un central numerique capable de commuter des signaux numeriques modules par une porteuse bande vocale sur le reseau a commutation de circuit avec des paquets de signaux numeriques non modules sur le reseau a base de paquets. La commutation numerique fonctionne par demodulation de signaux numeriques provenant du reseau a commutation de circuit et destines a etre transmis sur le reseau a base de paquets, et par modulation des paquets de signaux numeriques provenant du reseau a base de paquets et destines a etre transmis sur le reseau a commutation de circuit. Le discriminateur d'appels permet le basculement selectif ente le mode vocal et le mode numerique.

Central vocal et numerique via un reseau de type paquets

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