Abstract: An apparatus for powering one or more television cameras through an information signal transmission line wherein the television camera is operated by a constant DC current and outputs multiplexed electrical information signals is provided with a constant current supply unit and a rechargeable battery for powering the television camera when the constant DC current is cut off. A transmission line connects the television camera with the constant current supply means for feeding the television camera with the constant DC current and feeding the current supply unit with the multiplexed electrical information signals. The constant DC current provided by the constant DC current supply unit is equal to the sum of a constant current required for operating the television camera and a constant current required to charge the rechargeable battery.

Abstract: In an apparatus for powering a television interphone monitor for communication between entrances of a building and individual apartment of the building, power is fed to the television interphone monitor which is operated by a rechargeable battery, through a transmission line which is of low cost. The apparatus includes a single entrance panel or a number of entrance panels each of which has a TV camera and a circuit for processing an electrical information signal which may include a video signal. One or a number of television interphone monitors are connected via respective transmission lines to power supply units which may be included in an entrance unit which is in turn connected to the entrance panels. The power supply units supply a regulated current to the rechargeable battery.

Abstract: An apparatus for the selective routing of information signals includes a plurality of transmitting units. Each transmitting unit has a transmitter for transmitting information by converting the same into a light signal. A plurality of fiber optic lines are provided for carrying the light signal from the transmitting units. Each fiber optic line corresponds to one of the transmitting units. At least one receiving unit is provided for selectively receiving the information carried by the fiber optic lines. The receiving unit includes a liquid crystal panel having a plurality of light passing areas. The optical transmission properties of the light passing areas are controlled individually, for selectively receiving the light from the fiber optic lines, for effecting connections between the transmission units and the receiving unit by the fiber optic lines in any arbitrary combination. Each light passing area corresponds to one of the fiber optic lines.

Abstract: An apparatus for selecting information signals includes a plurality of transmitters, each of which processes an electrical information signal preferably including a video signal. A plurality of receivers selectively receive that video signal. A plurality of information transmission lines connect each receiver to the plurality of transmitters. A generator for generating an external synchronizing signal generates and feeds an external synchronizing signal to the plurality of transmitters and the plurality of receivers.

Abstract: A method and apparatus for synchronous switching of a plurality of transmitters each including a television camera for generating composite video signals and each incorporating an individually allotted identification code, in which at least one transmission line receives and transmits information to and from the plurality of the transmitters. A receiver incorporates an external synchronizing signal generator and an identification code generator for receiving and displaying the images on the monitor, for synchronizing a plurality of the transmitters and for transmitting identification codes superposed into the composite video signal generated by the transmitter by injecting the external synchronizing pulses and the identification code into the video transmission line.

Abstract: An apparatus for synchronizing a terminal equipment such as a TV camera includes an external synchronizing signal generator which includes a switching circuit which generates two frequency signals and alternately transmits these signals to the terminal equipment which is provided with a decoder circuit decoding an alternating rate of the two signals outputted from the synchronizing signal generator, and an internal synchronizing signal generating circuit receiving a decoder circuit and generating a new synchronizing signal on the basis of the decoded signal.

Abstract: In a method and apparatus for converting a synchronizing signal received from a controller for controlling a TV camera into a new synchronizing signal, a single frame synchronizing pulse for every two field pulses is generated on the basis of at least a vertical drive signal of the synchronizing signal received from the controller. The new synchronizing pulse which has a level higher than the white level and lower than the black level of a composite video signal generated by the TV camera is injected into a video transmission line connected to the TV camera for synchronizing the latter on the basis of the injected synchronizing pulse.

Abstract: In a converting method and apparatus therefor, synchronizing signal is received from an external synchronizing signal generator, which includes a circuit which generates two or more frequency signals, and alternately transmits these signals to the converting apparatus. The apparatus includes a decoder circuit for decoding an alternating rate of the frequency signals, outputted from the external synchronizing signal generator, and generating a new synchronizing pulse signal on the basis of the decoded signal. The new synchronizing pulse signal which has a level higher than the white level or lower than the black level of a composite video signal, generated by the TV camera, is injected into a video transmission line connected to the TV camera for synchronizing the latter on the basis of the injected synchronizing pulse.

Abstract: In a method and apparatus for coding, processing and retrieving a signal, a plurality of transmitters each including a television camera, generate composite video signals each superposed with an allotted identification code through a transmission line. A sequential switch circuit is provided which connects a plurality of the composite video signals for at least one vertical scanning period of the composite video signal in synchronized sequence with the vertical scanning frequency, and outputs the sequencing signals to a video recorder for recording the sequencing composite video signals superposed with the identification code. The played back regeneration signals are fed to a control circuit and to a memory circuit. The control circuit has a code setting circuit and an extraction circuit which extracts the identification code from the composite video signal for selecting any individually recorded signal when the extracted identification code and the set code coincide.

Abstract: In a method and apparatus for converting a synchronizing signal received from a controller for controlling a TV camera into a new synchronizing signal, a single frame synchronizing pulse for every two field pulses is generated on the basis of at least a vertical drive signal of the synchronizing signal received from the controller. The new synchronizing pulse which has a level higher than the white level and lower than the black level of a composite video signal generated by the TV camera is injected into a video transmission line connected to the TV camera for synchronizing the latter on the basis of the injected synchronizing pulse.

Abstract: A TV camera supporting device to be used in a surveillance system in a building or the like includes a first supporting member receiving a TV camera fixed thereto, a second supporting member rotationally-adjustable relative to the first supporting member and connectable thereto, and a third supporting member which has an axis of rotation intersecting the axes of rotation of the first and second supporting members and is angularly rotatable about its axis of rotation to adjust a relative position between the third supporting member and the second supporting member to which the supporting member is secured after the adjustment. By adjusting the relative positions of the three supporting members, the direction of the optical axis of the TV camera can be adjusted as desired.

Abstract: A closed circuit television apparatus comprises a plurality of transmitters each including a remote-controlled television camera for generating video signals to a central supervisory station and a circuit for generating first code signals corresponding to a camera code allotted to the television camera, a receiver which receives the video signals and displays images corresponding to the received video signals. A controlling device is provided for controlling the television camera, receiving the first code signals, generating control signals to control the television camera and second code signals corresponding to the received first code signals, and transmitting the control signals and the second code signals to the television camera. A switching device is connected to the transmitters for selecting a transmitter to be connected to both, the receiver and the controlling device.

Abstract: A closed circuit television apparatus comprises a remote-controllable television camera including an image pick-up device for generating a video signal, a plurality of controlling devices each having an operating circuit for generating a plurality of control signals to control the television camera, and a displaying device which receives the video signal and displays a picture or image corresponding to the received video signal, and a distributing device which connects the displaying devices of the respective controlling devices to the television camera for distributing the video signal from the television camera to the controlling devices. Each operating circuit outputs a modulated control signal of a carrier frequency higher than the frequency of the video signal, to a circuit portion connecting the distributing device to the displaying devices.

Abstract: A closed circuit television apparatus for a supervisory system comprises at least one imaging device which includes a remote-controllable television camera for generating video signals, a monitor receiving the video signals and displaying images corresponding to the received video signals, and a controller for generating composite control signals to control the television camera. The composite control signals have a higher frequency than that of the video signals. The imaging device further includes a receiver receiving the composite control signals, extracting the composite control signals by utilizing the difference in frequency between the received composite control signals and the video signals, and operating the television camera based on the extracted composite control signals.

Abstract: In a closed circuit television apparatus, a television camera comprises an imaging device for generating video signals, a driver adapted to the imaging device to be rotated in order to change coordinates positions of the imaging device, a detector for detecting an angle of the coordinates positons of the imaging device as electrical signals, and a memory in which an information is stored and from which the information is read out. A controller is provided for receiving a command to store the control information for setting the imaging device in predetermined coordinates positions and a command to change the coordinates positions of the imaging device. The controller reads out from the memory the control information corresponding to the change command upon receipt thereof, and operates the driver until the output signals of the detector coincide with the read-out control information.

Abstract: A closed circuit television camera for a supervisory system includes a number of transmitting devices which generate video signals and are located at each of a number of different places to be observed, a television receiver which receives the video signals, and a switching device which selects one of the transmitting devices and connects the same to the television receiver. Each transmitting device includes a television camera having a specific code, a circuit for generating code signals and a circuit for generating composite signals. The receiver has a circuit for receiving the composite signals which also extracts the code signals from the composite signals and generates display signals to identify the television camera corresponding to the extracted code signals. Visual information corresponding to the display signals is displayed on a monitor.