Abstract: There is disclosed a synchronous circuit and a receiver in which a long code for use in communication can be determined in a short time, and circuit scale can be reduced. Upon receiving input of a data stop signal from a control unit, a matched filter continues to hold the signal held at the time, performs a product sum operation of a spreading code successively inputted from a spreading code generator and the held signal, and successively outputs correlation signals in the synchronous circuit and the receiver.

Abstract: An image input device can pick up images of a plurality of subjects by switching the image pickup direction. The device is provided with an image pickup device for outputting an image signal corresponding to a picked-up image of a subject, an image pickup direction switching device for switching an image pickup direction of the image pickup device, a first detector for detecting the angle of the image pickup direction, and a memory for storing the image signal according to the detected angle.

Abstract: The present invention is a frequency control and orthogonal detection circuit and a FSK receiver capable of reducing a circuit size and control of VCO appropriately. The orthogonal detection circuit and the FSK receiver of the present invention include a delay circuit, a decoder for decoding the direction of rotation, and a first integral electric discharging circuit to detect the direction of rotation of the signal point of a signal received. There is also a second delay circuit, an XOR circuit, an adder, and a second integral electric discharging circuit to detect a rotation of the signal point of a signal received. The decision circuit decides a symbol on the basis of them. The AFC circuit controls the frequency of a signal outputted by the VCO in comparison with an ideal signal outputted by the standardizing circuit.

Abstract: The present invention provides a spreading code generation circuit and demodulation circuit capable of maintaining reception characteristic of a receiver in a preferable condition, and a grand phase control in a short time, and eliminating necessity of monitoring the phase control amount.

Abstract: A camera section for photographing an object to generate a video signal is connected via a cable to a video signal processing section that receives and processes the video signal. When the camera section is replaced with a different one, signals corresponding to the new camera section are automatically provided. A video signal, a synchronizing signal therefor, a clock signal, and control data are multiplexed on a signal line in the cable and the signal obtained is transmitted from the camera section to the video signal processing section, and control data is sent from the video signal processing section to the camera section. These control data are transmitted during a vertical interval of the video signal, and a DC voltage is supplied to the camera section from the video signal processing section via a shield line that is paired with the signal line in the cable.

Abstract: The present invention provides a code division multiple access receiver which can maintain the accuracy of the result of demodulation of a received signal at a good level without increasing the scale of circuits and the amount of computation.

Abstract: A video camera apparatus for a video conference is arranged to detect the zoom level of a zoom lens by a zoom level detecting circuit and to control a motor control circuit according to the result of detection in such a way as to lower the speed of a panning or tilting operation on a video camera accordingly as the position of the zoom lens shifts from a wide-angle position to a telephoto position. In panning or tilting the video camera in a zoom-in state, this arrangement makes the panning or tilting speed lower than the speed of panning or tilting performed in a zoom-back state, so that the movement of objects on a picture displayed on a monitor can be effectively moderated to make the details of the display easily discernible without any unpleasant impression. The arrangement thus facilitates the operation on the video camera.

Abstract: An image input apparatus is provided for picking up an image of an object placed on an original support with a camera and displaying the object image on a display device, the apparatus has a memory capable of storing a plurality of images picked up with the camera and a controller for controlling display of an image group containing a predetermined number of images stored in the memory.

Abstract: A teleconference system by which a reservation for use can be readily and certainly established. The teleconference system includes an input unit for inputting image data and audio data; an output unit for outputting image data and audio data; a communication unit for multiplexing the image data and the audio data; a reservation management unit for controlling a reservation time at which the teleconference system is used and for allowing a reservation partner to use the teleconference system when the reservation time has come; and an interface unit for connecting with an external device. The reservation management unit performs a reservation control of a teleconference system based on reservation information sent from the external device via the interface unit.

Abstract: In a conference system of the present invention, a terminal modulates a sound signal taken by a micro-phone which is connected to the terminal, a coordinate information signal which is designated using a digitizer, and a video signal. The terminal converts the modulated signals to an optical signal by frequency multiplexing, and send the optical signal to the central device of the system. After the central device receives the optical signal, the device separates and extracts a sound signal, a coordinate signal, and a video signal from the optical signal. Each of these separated signals is sent to a corresponding demodulating circuit to be demodulated, outputted as sound or an image afterwards. Further, the coordinate information signal is processed, for instance, as a command data from a conference attendant.

Abstract: A video camera apparatus for a video conference is arranged to detect the zoom level of a zoom lens by a zoom level detecting circuit and to control a motor control circuit according to the result of detection in such a way as to lower the speed of a panning or tilting operation on a video camera accordingly as the position of the zoom lens shifts from a wide-angle position to a telephoto position. In panning or tilting the video camera in a zoom-in state, this arrangement makes the panning or tilting speed lower than the speed of panning or tilting performed in a zoom-back state, so that the movement of objects on a picture displayed on a monitor can be effectively moderated to make the details of the display easily discernible without any unpleasant impression. The arrangement thus facilitates the operation on the video camera.

Abstract: A video-signal output apparatus according to the present invention is an apparatus for outputting a black-and-white video signal. The video-signal output apparatus is arranged to generate a black-and-white video signal, add a burst signal to the black-and-white video signal, and output the black-and-white video signal with the burst signal added thereto. Accordingly, a black-and-white picture with no cross color can be displayed on a color monitor device.

Abstract: In a recording apparatus having different modes of recording on a recording medium including a first recording mode in which at least information on sounds is recorded and a second recording mode in which information other than information on sounds is recorded, the amount of room remaining for recording on the medium is detected; and control means is arranged to change the mode of displaying the detected remaining amount of room for recording according to a selection made between the first and second recording modes.

Abstract: A synchronizing pulse signal generation device separates horizontal and vertical synchronizing signals from a video signal; generates a clock signal which is phase locked relative to the phase of the horizontal synchronizing signal; and generates, by using the clock signal, a synchronizing pulse signal which is phase locked relative to the vertical and horizontal synchronizing signals.

Abstract: There is disclosed a phase-locked loop circuit for obtaining an output in phase with an incoming signal including a phase comparator arranged to compare phases of incoming two pulse signals to detect a phase difference between them only during a predetermined time in every period of one of said incoming pulse signals and to produce an output signal corresponding said phase difference and a controlled oscillator arranged to produce an output having an output frequency varying in accordance with the output signal of said phase comparator. According to the phase-locked loop circuit as disclosed, a pulse signal having a frequency produced by frequency division of said output frequency and a constant pulse width is formed and this pulse signal is fed to said phase comparator as the other one of said incoming pulse signals, whereby the occurrence of a false locked state is prevented.

Abstract: A synchronizing pulse signal generation device separates horizontal and vertical synchronizing signals from a video signal; generates a clock signal which is phase locked relative to the phase of the horizontal synchronizing signal; and generates, by using the clock signal, a synchronizing pulse signal which is phase locked relative to the vertical and horizontal synchronizing signals.

Abstract: A phase locked loop circuit including a controllable oscillator, a phase detector for detecting a phase difference between an output signal of the oscillator and an input signal, and a control signal generator for generating a control signal for controlling an oscillation frequency of the oscillator on the basis of the output of the phase detector. The phase locked loop circuit also includes a feedback circuit for controlling a level of the control signal on the basis of a DC level thereof. The feedback circuit is able to temperature compensate for changes in the oscillator output signal thereby keeping the lock range of the phase locked loop circuit constant against variations in temperature.