An automobile communication system which provides for transmitting stations located along highways and facilities located in vehicles such that the vehicle can receive information as to stop signs, whether the vehicle should turn left or right or proceed straight forward, distances to particular landmarks on the highway are given. Signal lights may be indicated in the vehicle as well as the speed of the vehicle. A driver instructed memory in the vehicle can be supplied with information indicatin...

7. A system for communicating electromagnetic signals through the atmosphere between at least two underwater objects capable of transmitting and receiving electromagnetic signals comprising a transmitter and receiver for said signals carried by each of said objects, first conductive means carried by each said object and disposed within the water for radiating said transmitted signals into the water and producing conductive currents and corresponding fields in the water surrounding said object an...

A communications cable system comprises a plurality of cables joined end-to-end, each cable comprising a plurality of single-material optical fibers, and a plurality of joint accessories each joining the ends of an adjacent pair of cables. At the end of each cable is provided a plurality of short cladded-core optical fibers optically joined to the ends of respective single-material fibers. The other ends of the cladded-core fibers project and the projecting cladded-core fibers of the two joined ...

A communication link for transferring information from a data terminal with connected light pen (3), which includes a light diode (4) and a phototransistor (5) or corresponding means, to a greater computer unit. According to the invention, the communication link (1) includes an information transferring device, which according to a first embodiment comprises a phototransistor (11). The light pen (3) is arranged so as by means of its light diode (4) to emit light corresponding to information store...

There is disclosed a communication system wherein the transmitter and receiver synchronously change frequency during transmission of information and wherein each frequency to be used before transmission of information on that frequency is examined and as a result of such examination the receiver is adjusted to attempt to reduce the detrimental effects of interfering signals.

1. In combination, a first source for producing a first signal representative of intelligence to be transmitted from one point to another, second source for producing a binary carrier signal having a first voltage level and a second voltage level, means responsive to the first signal and to the binary carrier signal for frequency-modulating the carrier signal in accordance with the first signal to produce a modulated intelligence signal having first and second voltage levels and exhibiting trans...

A vehicle communication system device consisting of an opto-electrical message display unit adapted to be viewed from the exterior of the vehicle and of a message control unit that is connected to the display unit for programming a message and transmitting an electrical pulse pattern to the display unit that causes the display unit to display the programmed message.

In a communication system including communication transmitting means for modulating a carrier wave having a fixed frequency by a communication signal having communication content and for radiating the modulated signal wave, and receiving means for receiving the modulated signal radiated from the communication transmitting means to demodulate the communication signal, the communication system comprises a communication shielding area provided at a desired location on a boundary between communicati...

Communication cable with improved audio and radio frequency transmission and shielding characteristics uses a tinned annealed steel foil tape for shielding.

A communication cable, and the method and apparatus therefore, made up of twisted strands of laid component conductors, wherein the component conductors are laid at pitches varying stepwise throughout their lengths and/or the strands are twisted at pitches varying stepwise throughout their lengths, whereby the production speed and efficiency are drastically increased as compared to conventional communication cable production techniques.