摘要:
A cassette tape-loading apparatus applied to a magnetic recording and reproducing apparatus using a cassette tape comprises a device for determining the amount of rotation of supply and take-up reels, a device for detecting the rotational direction of the reels, and a device for detecting the amount of tape drawn out of the cassette. Before loading the cassette tape, the ratio of winding diameter between the supply and take-up reels is computed, and the result is used to set the torque of the reel-driving motors and start the loading operation. At the time of loading, on the other hand, the amount of rotation of the two reels is determined, and the winding diameters of the reels computed from the winding diameter ratio and the amount of drawn-out tape thereby to set a proper tension of the magnetic tape. Since the tension applied to the magnetic tape and the torques of the reel motors are set in accordance with the winding diameter ratio and the winding diameters, magnetic tape of substantially equal amount is drawn out of each of the two reels, with the result that the magnetic tape is not subjected to an abnormal tension, thereby making possible a stable cassette tape-loading operation without damaging the tape or displacing the tape position.
摘要:
The precedingly reproduction signal reproduced by a precedingly reproducing head is recorded on a tape. If it is detected that the reproduction signal includes abnormality owing to a reason such as poor error rate, the recording operation is stopped. Then, for retrial of the recording, the information on the position where the abnormality has occurred is held. A memory may be provided to always rewrite and store the signal reproduced by the precedingly reproducing head, and also a simultaneously reproducing head which is different from the precedingly reproducing head may be provided to immediately monitor the recording state of the signal recorded on the tape. If it is detected that the signal reproduced by the simultaneously reproducing head includes abnormality, the recording operation is stopped, the information on the position where the abnormality has occurred is held. Further, the rewrite operation in the memory is stopped and the original precedingly reproduction signal corresponding to the signal to be recorded at the position where the abnormality has occurred is held in the memory.
摘要:
A magnetic recording and reproducing apparatus having a construction in which a digital signal including index signals recorded on a magnetic tape is reproduced and rotary magnetic heads are movable. The digital signal is reproduced by digital signal reproducing means including the rotary magnetic heads. A particular index signal among the index signals is detected by index signal detecting means. Further, the timing for reproducing the particular index signal is detected by timing detecting means. The rotary magnetic heads are moved and deviated in the direction of the rotary shaft of the rotary cylinder by rotary magnetic head position deviating means. Tape speed detecting means compares a reproduction clock with a reference clock and outputs a tape speed signal. First rotary magnetic head position deviation control means forms a control input for the rotary magnetic head position deviating means on the basis of the tape speed signal. Second rotary magnetic head position deviation control means forms the control input for the rotary magnetic head position deviating means on the basis of an output signal of the timing detecting means.
摘要:
The specification discloses a magnetic recording signal reproducing apparatus for controlling a magnetic tape and reproducing magnetic heads.In the magnetic recording signal reproducing apparatus of the invention, a magnetic tape which is moved for magnetic heads attached to a rotary cylinder is traced by the magnetic heads and signals recorded on tracks of the magnetic tape are reproduced. A construction of the apparatus includes a tracking control system, a tape tension control system, and an apparatus for selectively switching operations of both of the control systems. The tracking control system includes: an apparatus, attached to the rotary cylinder, for moving the magnetic heads in the width direction of the tracks in accordance with a tracking signal; and an apparatus for sampling the signals detected by the magnetic heads, for comparing a preceding sampled value with a present sampled value, and for generating the tracking signal such that the present sampled value is larger than the preceding sampled value. The tape tension control system includes: an apparatus for detecting changes per predetermined time in levels of the signals detected by the magnetic head; an apparatus for giving a tension to the moving magnetic tape and for adjusting the tension in accordance with a tension control signal; and an apparatus for generating the tension control signal to adjust the tension according to change amounts per predetermined time of the signal levels to a reference value. Further, the switching apparatus includes switching means for receiving the signals detected by the magnetic heads and for selectively energizing either one of the tracking control system and the tape tension control system in accordance with the levels of the signals. Another magnetic recording signal reproducing apparatus according to the invention comprises: two magnetic heads arranged to a cylinder so as to simultaneously trace adjacent tracks; an apparatus, attached to the cylinder, for individually moving the two magnetic heads in the width direction of the tracks in accordance with a head position control signal; and an apparatus for generating the head position control signal to move the magnetic heads in the width direction of the tracks in a manner such that when the recorded signals are reproduced at a speed different from a tape moving speed upon recording, amplitude levels of the reproduction signals detected by the two magnetic heads locating at predetermined track positions have a relation of opposite phases.
摘要:
A tape transport control apparatus relating to changing means of high speed reel control transport and low speed capstan control transport in a tape transport control of a magnetic recording regenerative apparatus or the like. Particularly in a period of transition from the high speed driving state to the low speed driving state, a capstan motor is controlled through means for comparing phase of the control signal of the tape transport speed regenerated on the tape with phase of the capstan frequency generator signal of the capstan, and after the phase comparing means detects that the tape speed and the capstan rotational speed are coincident, the pinch roller is pressed against the capstan.
摘要:
Blocking a view of a whiteboard by a position of an attendee who writes on the whiteboard is prevented, and writing records made by all attendees are stored in order to use the writing records including a course of the written records later. Each terminal of all of the attendees has a touch-panel-equipped terminal having a function of dividing any input line drawing on the terminal into line segment data, successively transmitting the line segment data to the controller, and displaying line drawing information transmitted from the controller on the display of the touch-panel-equipped terminal. A liquid crystal projector having a controller that can be embedded therein or that is connectable thereto is provided, the controller having a function of sequentially recording line drawing information transmitted from each touch-panel-equipped terminal in a data base, adding the line drawing information to a video image memory of the whiteboard, and projecting the video image memory contents onto a wall surface while transmitting information of the data base to each touch-panel-equipped terminal.
摘要:
An information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus has a main information reproducing system for reproducing main information recorded in a given recording medium; and a reproduction management system for managing the main information reproducing system for reproducing the main information. A receiver is provided with a unit for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing system provided with a reproduction disabling function for limiting the reproduction of main information.
摘要:
An apparatus for recording/reproducing video and audio signals on/from a recording medium includes a first and second tuner which receive a video signal of a first and second format transmitted by broadcasting, respectively; a recorder which records the video signal of the first format from the first tuner on the recording medium; a reproducer which reproduces the video signal of the first format from the recording medium; and a decoder which decodes the video signal of first format from the reproducer and converts the decoded signal to another video signal of the second format. A switching circuit is provided which selects one of the another video signal of the second format and the video signal of the second format as a selected video signal, and a video output terminal outputs the selected video signal through an on-screen display unit.
摘要:
A TV program selection support system selects only programs suiting viewer's preference or necessary for a viewer from a large number of programs to be broadcast and proposes the selected programs to the viewer. The TV program selection support system comprises a program receiver for receiving broadcast TV programs, an EPG receiver for receiving an electronic program table listing TV programs, an EPG storage device for storing an EPG received by the EPG receiver, an operating means to be operated by the viewer to select a program from the stored electronic program table, a program selection support program for determining viewer's view tendency by analyzing the operation made by the viewer, creating an electronic program table on the basis of the view tendency and displaying the created electronic program table.
摘要:
A recording apparatus of a helical scan system, including a first video head which records video signals on a magnetic tape when a running speed of the magnetic tape is a standard speed and a second video head which records video signals on the magnetic tape when the running speed of the magnetic tape is approximately 1/N of the standard speed, N being an integer larger than 3.