Abstract: A micrprocessor-controlled, frequency-synthesized radio transceiver system comprise a microprocessor for controlling the synthesis of local-oscillator frequencies for both the transmitting and receiving of radio signals. The microprocessor has a predetermined control capacity significantly smaller than the capacity required to control the synthesis of local-oscillator frequencies for a first plurality of radio frequencies. A transmitter circuit and a receiver circuit are capable of operating at all radio frequencies within the same predetermined band of frequencies. A control input arrangement permits customizing the microprocessor to control the synthesis of local-oscillator frequencies for a second plurality of radio frequencies within its predetermined control capacity.

Abstract: A power-saving relay circuit for reducing power consumption from a power supply comprises a relay including a selectively energizable relay coil, a plurality of movable contactors, and a plurality of fixed contacts including first and second fixed contacts associated with each of the movable contactors. Each of the movable contactors is normally in electrical contact with the first fixed contact and responsive to energization of the relay coil for breaking the electrical contact with the first fixed contact and for making electrical contact with the second fixed contact. A current limiting circuit is coupled in electrical series circuit intermediate a selected one of the second fixed contacts and the relay coil. The movable contactor associated with the selected one of the second fixed contacts is capable of being coupled in circuit with the power supply for completing an electrical circuit through the current limiting circuit for energizing the relay coil.

Abstract: A method for intensifying brightness of a predetermined pattern in a video display comprises detecting the duration of predetermined portions of said video signal; detecting the predetermined pattern in these predetermined portions of said video signal; and producing an output control signal in response to each detection of the predetermined pattern of at least a predetermined duration. Apparatus is provided for carrying out the method.

Abstract: A waiting time display system comprises a plurality of remote stations each including a waiting time display unit comprising a display portion for producing a visual display corresponding to waiting time and a control unit comprising control means selectively actuatable for producing predetermined output signals corresponding to a selected waiting time. A centralized monitoring unit is also provided and is responsive to the output signals from each control unit for monitoring the waiting time displayed on each display unit. A plurality of transmission lines coupled intermediate each of the control units and its associated display unit and intermediate each of the control units and the centralized monitoring unit for transmitting the output signals from each control unit to its associated display unit and to the centralized monitoring unit, respectively.

Abstract: A system is provided for transmitting data from at least one control position to at least one remote display position over a plurality of transmission lines coupled between the control position and the display position. These transmission lines include a common power supply line, a ground line and a number M of conductors. Each conductor is used for transmitting one or more of a number N of different data. The display position includes a number R of display characters. The invention provides circuits for transmitting N data on M transmission lines to actuate a given combination of R display characters corresponding to each of the N data wherein both R and N are greater than M so that the transmission lines are fewer in number than either the number of data or the number of display characters.

Abstract: An antenna defines a coaxial connector receptacle when the antenna is in a fully retracted position.

Abstract: YAn amplified video signal distributing apparatus is provided which has a plurality of input terminals. An associated plurality of input signals are applied thereto for selective application to at least one utilization device which is coupled to the output of the apparatus. The apparatus comprises a primary input terminal, a plurality of secondary input terminals, switches for selecting the signal which appears at one of the secondary input terminals, at least one output terminal, and a signal generator for generating a primary control signal and a secondary control signal. A controllable switch is responsive to the primary control signal for coupling the primary input terminal to at least one of the output terminals and is responsive to the secondary control signal for coupling the signal selected by the selecting switches to at least one of the output terminals.

Abstract: An antenna comprises an antenna body telescopically movable between a fully retracted position and a fully extended position and having a free end. A BNC-type coaxial receptacle is mounted to the free end of the antenna body. A mounting base receives the BNC-type coaxial receptacle when the antenna is in the fully retracted and completes an electrical ground circuit to the BNC-type receptacle.

Abstract: A signal distribution apparatus for selectively coupling each of a plurality of inputs to one or both of two outputs substantially without interference between the inputs or the outputs. The signal distributing apparatus comprises a plurality of input terminals and balanced couplers, such as balun coils, for providing a balanced line from each input terminal. A switching network is coupled intermediate the balanced couplers and the two outputs for selectively and individually coupling each balanced line to one or both of the outputs.

Abstract: An intrusion monitoring apparatus wherein horizontal and vertical sync signals separated from the video signal generated by a monitor television camera are used to produce window pulses having respective timings and lengths corresponding to discrete spots on the video frame screen, said window pulses being used for gating the input video signal, sudden level change of the respective gated video signal portions being detected to provide an audible and/or visual alarm.

Abstract: A speaker driving circuit for use with an audio amplifier made selectively ineffective comprising switching means for providing intermittent current to the speaker when said means is energized.

Abstract: A digital signal generating circuit having a control site, a remote digital signal generating site and a two-wire cable connecting said control site and said digital signal generating site. The control site produces various Zener diode trap voltages by switch state combinations. These trap voltages are transmitted to said digital signal generating site through said two-wire cable. A plurality of level sensing units are provided in said digital signal generating site. These level sensing units sense the respective levels of the transmitted trap voltages. A plurality of switching units are provided relating to the respective level sensing units, each for generating one of two logical outputs when the related sensing unit senses a predetermined trap level condition.

Abstract: A DC motor control apparatus is disclosed comprising a first pair of switching elements coupled respectively with oppositely poled ends of the DC motor. A first actuating means is provided for actuating one of a first pair of switching elements in response to an input signal of a first predetermined logic content. The other of the first pair of switching elements is provided to respond to an input signal of a second predetermined logic content. Also provided, are means for applying a driving potential to the oppositely poled end of a motor simultaneously with the actuation of each of the first pair of switching elements, thereby establishing a current path for forward direction and reverse direction operation of said DC motor, respectively. A second pair of switching elements are respectively connected to oppositely poled ends of the DC motor.

Abstract: An improvement in a radio receiver having a power supply and an audio amplifier circuit comprises a switching circuit interposed between the power supply and the audio amplifier circuit and including a control input responsive to a signal of predetermined level for substantially cutting off the audio amplifier circuit means from said power supply. In accordance with one aspect of the invention, this control input may be coupled to a squelch circuit. In accordance with another aspect of the invention, this control input may also be coupled to an AGC circuit.

Abstract: An automatic back-up circuitry for use with a memory circuit or the like including a switch transistor adapted to turn on in response to the application of an operative current and conduct it to the memory circuit, said transistor being also adapted to turn off when the application of the main operative current to said transistor is release, whereupon the back-up voltage is applied to the path between the transistor and the memory circuit.