A Communication Manager for controlling communication between intelligent processors. The Communication Manager is a software on silicon building block providing a set of primitive instructions to extend the instruction set of the underlying microprocessor and to provide a real time multitask capability. The Communication Manager handles a command control block (CCB) and shared line receiver and shared line transmitter state registers to receive and send data on a shared communication line.

A communication network includes a plurality of nodes which are connected by transmission lines, preferably of optical fibers. One or more terminals such as general purpose computers are connected to selected ones of the nodes also via the transmission lines. Each of the nodes comprises a plurality of input channels, a like plurality of output channels and a connection controller for controlling the connecting condition between the input and output channels. Each of the input channels is paired ...

Tactile communication is realized via one or more tactile cells each of which comprises one or more tactually perceptible indicia, each cell being further adapted to include means for tactually conveying font information corresponding to that cell, the font information preferably being in the form of a tactile sensation indicative of the font and brought about one or more cell indicia.

An earphone for a wireless communication system having a transceiver unit for converting electrical signals to audio signals and coupling the audio signals through the earphone includes a shallow cup that has a communication passage between the exterior and interior with a closure member biased to a first position for sealing the communication passage and having a switch manipulatable to move the closure member from the position position to provide voice communication through the communication p...

A communication apparatus for receiving both power and a sensor signal over the same transmission line having a first variable impedance element and a receiving impedance element connected in series across the transmission line, a second variable impedance element and a series impedance element connected in series across the transmission line, and a control circuit for controlling the first variable impedance element to maintain the transmission line voltage constant and for controlling the seco...

A communications system provides for the location or tracking of persons or objects to automatically establish two-way conversation with the person located via an associated intercom or telephone system. The locating system provides each person or object to be located with an infrared pulse transmitter which operates continuously automatically and repetitively. It requires no action on the part of the person being monitored. The system is cost effective and accurate by reason of the infrared pul...

A digital filtering system is provided for communicating and processing signals using a digital filter for signal separation and signal enhancement. A digital correlator is provided for generating high resolution output data in response to low resolution input data processed with low resolution computational circuits. In one embodiment, a real-time time-domain correlator is provided with single-bit resolution computational elements to implement the correlation filtering operation. Use of the hig...

A communication system includes a digital switching network, a first apparatus for establishing communication paths interconnected thereto via a terminal element and a second apparatus for establishing communication paths interconnected directly thereto. The second apparatus being dedicated to communicating with the network via packetized messages.

A communication system includes a common receiver unit and a plurality of satellite transmitter units remote from the receiver unit. Each transmitter unit has a logic section and a transmitter section, and each transmitter unit is switchable between a standby mode in which no message is to be sent to the receiver unit and an active mode in which a message is to be sent to the receiver unit. The logic section generates status messages and data messages, the format of the status message including ...

A local area network has a plurality of data stations 1 each connected to a common data channel 2 via a receiver 5, a transmitter 6 and a directional coupler 7, wherein, in order to resolve contention for the channel and at the same time providing each station with statistically an equal chance of gaining use of the channel, each station contends for use of the channel by transmitting, when the channel is free, transmission request signals in a sequence of consecutive time periods wherein in eac...