A broadband signal broadcasting system comprising a circuit to encode video and audio signals forming a TV channel to be sent to a switching matrix, which is remotely operated by the subscriber; a circuit to multiplex two or more TV channel to be simultaneously transmitted on the subscriber's line, which can be a coaxial cable, a radio link or an optical fiber; and a circuit to receive the signals transmitted on the line, to separate two or more TV channels and to carry out channel decoding by s...

In a receiver for satellite broadcasting service, a selected audio subcarrier is converted into an IF signal demodulated into a demodulated signal which is applied to a feedback voltage generating means which converts the applied signal into a feedback voltage at a voltage ratio corresponding to the maximum frequency deviation of the selected audio subcarrier. The feedback voltage is applied by an operational amplifier to a varactor diode in a voltage-controlled oscillator. The oscillation frequ...

A satellite audio broadcasting system for network programming and broad-based advertising includes a network uplink facility and a plurality of local radio station downlink facilities. The system permits pre-empting of network audio by the local station at any time, but automatically and constantly monitors the local broadcast, comparing it to the network audio, and automatically records any periods of departure. Computers are employed at uplink and downlinks, and from time to time the uplink ca...

In the storing mode, an operator section is operated to direct a parabolic antenna toward a broadcasting satellite and to select a desired channel. After the desired channel is seized, a predetermined label is input from a label input part. The satellite position and the selected channel are stored in a memory with the label attached thereto. When a search operation is performed, the direction of the antenna is gradually adjusted. Whenever the direction of the antenna is adjusted, the receiving ...

A broadcasting facsimile transceiver has a transmission controller which, in the broadcasting mode, inhibits broadcasting communications during a predetermined interval of time ranging from the completion of transmission to a destination to the commencement of transmission to the succeeding destination. The transceiver also includes a scanning unit for reading a document and delivering video data, a data compression unit for compressing the video data, a memory unit for storing compressed video ...

In a news program broadcasting system reference codes are assigned to news materials when a cue sheet is prepared and when the news materials are edited. These reference codes are compared with each other when the news materials are transmitted, whereby the news materials are transmitted under simple and reliable control.

A warning broadcast system features control signal means, preferably digital, for confirming transmission path integrity prior to broadcast of a spoken warning message. A radio receiver (1) in an alarm center has an auxiliary carrier reception stage (4) which feeds a decoder (5). A coincidence circuit (6) has a first input (7) connected to the decoder output for inputting the received broadcast control signal and a second input (8) for inputting a directly-coupled control signal via a delay line...

In a wired broadcasting system the switching means for selecting one of a plurality of program sources is a set of electromagnetic relay switches each having two operating coils connected into different switching circuits. Switching is accomplished from a train of pulses actuating thyrister circuits to operate selected sets of coils. In one embodiment three wires provide selection signals to three different relays having a common second winding circuit and energization of two coils on each relay...

A receiver for receiving a composite signal consisting of a multiplexed video signal and pulse code modulated audio signal time division multiplexed in a predetermined sequence and having a first synchronizing signal synchronized with the audio signal code modulated pulses, and a second synchronizing signal including a number of synchronizing signals required for the reproduction of the multiplexed video and audio signals, wherein the first and second synchronizing signals are inserted in predet...

A tractor-mounted broadcaster or spreader for granular materials includes a rotary spreader disc and an adjustable gate valve means above the disc and at the outlet of the material hopper. A power cylinder attached to a special support on the hopper operates a rocker arm which in turn is connected with a push-pull cable operatively connected with the movable gate valve element. By this means, the tractor operator inside of the tractor cab can remotely control the discharge of material on to the ...