The present invention is a dual communication mode sysem that combines a point to point communications device with a television receiver and a video tape recorder. The result is a highly versatile and...
In one way address transmission system of a PCM music broadcasting, a plurality of the PCM signals are time divisionally multiplexed and then the multiplexed data is scrambled for transmission. An address...
In a communication system, in which a great number of communication stations operate on the same telecommunication channel, such as a radio frequency, secret information transfer for selective calls as...
An apparatus and a method of providing an access control for transmitted stock market data from a central radio station to a plurality of one-way radio receivers. Into each receiver is inputted an access...
A radio signal receiving apparatus such as a pager with a security circuitry includes operator-controlled switches for providing a plurality of different command signals which are used to actuate the receiving...
