摘要:
In an automatic tracking system for a magnetic recording and reproducing apparatus wherein tracking is controlled so as to increase an amplitude of a reproduced signal which is delivered from a rotary head for reproducing a track recorded by a helical scan system, the amplitudes of the reproduced signal are detected at a plurality of points of time within one rotational cycle of the rotary head, and the tracking is controlled so as to increase a minimum value among the detected values at the plurality of points of time.
摘要:
A motor driving circuit includes an equivalent power PNP transistor constituted by a Darlington connection of a small-current PNP transistor and a large-current NPN transistor, and a switching regulator of a step-down and variable type is provided between the collector of the NPN transistor and the emitter of the PNP transistor. Electric power loss in the motor driving circuit can be reduced, and the electric power required to operate the motor driving circuit can be saved.
摘要:
A motor driving circuit in which the opposite ends of the motor driving coils of a video tape recorder (VTR) capstan motor are shorted by a group of switching elements when a control input voltage generated from a rotation detection/oscillator is in a predetermined range.
摘要:
Blocking a view of a whiteboard by a position of an attendee writing thereon is prevented, and writing records made by all attendees are stored to use the writing records including a course of the written records later. Each terminal of the attendees has a touch-panel-equipped terminal can divide any input line drawing on the terminal into line segment data, successively transmit the line segment data to the controller, and display line drawing information on the display of the touch-panel-equipped terminal. A liquid crystal projector having a controller that can be embedded therein or connected thereto is provided, the controller can sequentially record line drawing information transmitted from each touch-panel-equipped terminal in a data base, add the line drawing information to a video image memory of the whiteboard, and project the video image memory contents onto a wall surface while transmitting information of the data base to each touch-panel-equipped terminal.
摘要:
The present invention provides a video display apparatus and a terminal device that are easy to use. The present invention is provided with a display unit for displaying video content, a receiving unit for receiving a command transmitted by the terminal device, and a control unit for executing a process corresponding to the command received from the receiving unit. The control unit executes a process corresponding to a first command when the first command is received from a specific terminal device, but not a process corresponding to the first command when the first command is received from another terminal device; and executes a process corresponding to a second command when the second command is received from the specific terminal device or the other terminal device.
摘要:
An information recording apparatus such as an optical disc that can avoid an unrecordable condition between a power-on operation and an available state for recording thereby to solve a problem that an image taking chance is missed in a recording step, wherein its constitution is such that: receiving a command to turn on the apparatus after switching, a system controller drives a power-supply circuit to activate a drive controller and a memory controller; if the optical disc is not replaced while in power-off operation by a sub-battery, the system controller issues a request for high-speed activation, based on information stored in an EEPROM, to the drive controller, and drives plural drive control units one after another thereby to establish an activation period confirmedly, allowing the memory controller to accept a request for a recording start from the system controller without waiting for a report of activation completion to be issued by the drive controller.
摘要:
An information recording apparatus such as an optical disc that can avoid an unrecordable condition between a power-on operation and an available state for recording thereby to solve a problem that an image taking chance is missed in a recording step, wherein its constitution is such that: receiving a command to turn on the apparatus after switching, a system controller drives a power-supply circuit to activate a drive controller and a memory controller; if the optical disc is not replaced while in power-off operation by a sub-battery, the system controller issues a request for high-speed activation, based on information stored in an EEPROM, to the drive controller, and drives plural drive control units one after another thereby to establish an activation period confirmedly, allowing the memory controller to accept a request for a recording start from the system controller without waiting for a report of activation completion to be issued by the drive controller.
摘要:
A helical scanning video tape recorder for recording and reproducing video signals and audio signals to/from a magnetic tape. The video tape recorder includes an analog signal reproducing mode in which an FM luminance signal and a down-converted chrominance signal are reproduced from the magnetic tape by a pair of magnetic heads having a first azimuth angle and an FM audio signal is reproduced from a deep layer of the magnetic tape by a pair of magnetic heads having a second azimuth angle, and a digital signal reproducing mode in which a digital signal is reproduced from the magnetic tape by the pair of magnetic heads having the second azimuth angle. The digital signal is converted into a signal having a frequency in a frequency band higher than a frequency of the FM audio is signal. The video type recorder also includes a recording mode detector and a controller.
摘要:
A video data compression/playback system efficiently compresses a plurality of video data pieces through inter-frame predictive-encoding. Mixed video data VSMIr composed of time-divided video data received by video input terminals are divided video data pieces each of which corresponding to video input terminals and the video data pieces are written into memories respectively by a memory control circuit for recording mode. The mixed video data written into the memories is read, a specified number of frames at a time. An MPEG encoding circuit performs inter-frame predictive-encoding for each specified number of frames.
摘要:
A tracking method and apparatus used in a helical scan magnetic recording/reproducing system is based on an automatic tracking control using an envelope detection signal of a reproduced signal. The tracking apparatus is provided with a circuit for controlling the rotation speed of a capstan motor which transports a magnetic tape, a level comparing circuit for making the comparison for the level of an envelope signal of the reproduced signal, a circuit for applying a predetermined deviation to the rotation speed in accordance with the result of comparison, a circuit for detecting a steady speed deviation between a recording apparatus and a reproducing apparatus from a speed deviation signal generated in the process of the automatic tracking control, and a circuit for correcting the speed deviation.