Abstract: A set of displays are juxtaposed for jointly reproducing, either in still or in continuous motion, successive sets of correlated scenes according to a desired, and readily modifiable, presentation program. The correlated scenes to be reproduced by the displays are retrieved by video disk players from a set of video disks each having a multiplicity of individually addressable record tracks. A system controller is provided which has a rewritable memory for storing a presentation program including the addresses of desired record tracks on each video disks from which the prerecorded scenes are to be retrieved by one associated disk player in a desired sequence, and playback commands indicative of whether the prerecorded scenes on the desired record tracks are to be reproduced in still or in continuous motion.

Abstract: One or more, normally three, cathode ray tube displays are juxtaposed for simultaneous reproduction of correlated pictorial and literal images, either in continuous motion or in still, from two or more video disk players in which prerecorded video disks are to be loaded replaceably. A programmable system controller controls the operations of the disk players in accordance with a predefined program. As one of the disk players sequentially retrieves the prerecorded pictures from the associated video disk, an address detector circuit detects the successive disk tracks from which the pictures are being retrieved. Constantly informed of the current track address on that disk, the system controller causes the other disk player or players to retrieve desired pictures from preselected tracks on the other video disk or disks loaded therein.

Abstract: A data copying method comprises the steps of checking a starting track address and an end track address which are used for controlling a copying of a data from each set of several recorded tracks in a master disk to a slave disk having several unrecorded tracks only so as to store the starting track address and the end track address for each of the recorded tracks, reproducing the data from each of the recorded tracks in the master disk repeatedly for each recorded track to supply a reproduced data signal from the data, and recording and reproducing data signal onto the slave disk at its track addresses corresponding to those addresses of the recorded tracks in the master disk repeatedly for each recorded track in the master disk storage medium, the recording of the reproduced data onto the slave disk being stopped at track addresses of the slave disk corresponding to those addresses of the unrecorded tracks in the master disk.

Abstract: One or more, preferably three, cathode ray tube displays are juxtaposed for simultaneous reproduction of correlated picture signals from video disk players or the like. Each disk player is connected to one of the displays via a serial connection of two frame memories each capable of storing the successive frames of a picture signal one at a time. A wipe control circuit is connected to the latter stage frame memories for causing a wiping change from old to new scenes to take place on the displays in any selected one of several different wipe modes. Upon commencement of a wiping scene change, the wipe control circuit first freezes the latter stage frame memories, thereby retaining the last frames of the old scenes thereon, and gradually replaces the last frames of the old scenes on the latter stage frame memories with the first frames of new scenes from the preceding stage frame memories.

Abstract: A drop-out detection circuit which supplies an output signal indicative of a drop-out within information reproduced from a storage medium, when a rectangular wave signal produced from a modulated signal carrying the reproduced information does not supply a trigger pulse within a prescribed pulse duration. The drop-out detection circuit comprises a first pulse generation part for supplying a first pulse signal having a low level for a prescribed pulse duration when the rectangular wave signal changes from a low level to a high level, a second pulse generation part for supplying a second pulse signal having a low level for the prescribed pulse duration when the rectangular wave signal changes from the high level to the low level, and a logic gate for outputting the output signal having a high-level pulse supplied only when the first pulse signal and the second pulse signal both having the high level is supplied for a time period exceeding the prescribed pulse duration.

Abstract: A plurality of processor units (6a . . .6n), and a single host processor (4) coupled with the processor units (6a . . .6n) through transparent memories (10a . . . 10n) are provided for reading out results of parallel processing by the processor units. Each of the transparent memories (10a . . .10n) has a first bus (11a, 11b) for coupling processors (1a . . .1n) with memories (2a . . .2n) in the processor units (6a . . .6n), a second bus 12a, 12b) for coupling adjacent processor units, a first switch (13a, 13b, 14a, 14b) for switching the first bus, and the second bus, and a second switch (16) for switching direction of the second bus. The host processor (4) switches the first switch and the second switch, and accesses all the memories (2a . . .2n) simultaneously, and reads out those memories (2a . . .2n) simultaneously.

Abstract: A distortion eliminating circuit for eliminating a harmonic distortion from an input frequency modulated luminance signal comprises a comparator for producing a series of output pulses responsive to the input frequency modulated luminance signal by comparing the level of the frequency modulated luminance signal with a predetermined level, a filtering circuit for extracting a d.c. component from the series of output pulses by filtering out oscillating components from said output pulses, a detecting circuit for extracting a d.c. distortion component corresponding to the harmonic distortion in the input frequency modulated luminance signal by comparing the level of the d.c. component by a reference level, and a level adjusting circuit for adjusting the level of the input frequency modulated luminance signal by adding or subtracting the d.c.

Abstract: An optical tracking control apparatus comprises a differential amplifier for differentially amplifying signals respectively reproduced from two mutually adjacent track turns of a guide track on both sides of an intermediate part in which an information signal is recorded and reproduced on and from a disc, a zero crossing detector for detecting a zero crossing of an output signal of the differential amplifier and for producing a switching pulse signal, and a polarity inverting circuit responsive to the switching pulse signal for alternately inverting the polarity of a crosstalk component reproduced from the two mutually adjacent track turns of the guide track as crosstalk for every one-half period of the switching pulse signal. An output signal of the polarity inverting circuit is used as a tracking error signal for controlling the tracking of the light beam.

Abstract: An information recording disc has a control signal such as an address signal pre-recorded on a guide track which is pre-formed on the information recording disc at a position different from a track position where an information signal is to be recorded. An information signal recording apparatus for recording the information signal on such an information recording dics controls a rotation frequency of the information recording disc to a constant rotation frequency by locking a horizontal synchronizing signal within a composite video signal to edges of pulses reproduced from the guide track, and the information signal is recorded on the information recording disc so that a recording interval of the control signal is positioned within a vertical blanking period of the information signal at least including the composite video signal.

Abstract: A disc variation detecting apparatus comprises a light-sensitive element which faces the disc and is positioned together with a light-emitting element in a tangential direction of tracks on the disc. In this configuration, the following relationship is satisfied; d/L.ltoreq..beta./.alpha., where d is a width of a spot of the light beam in its displacement direction formed on the light-sensitive element, L is a length of the light-sensitive element in the displacement direction, .alpha. is an angular variation of the disc corrsponding to the length L, and .beta. is an allowable error angle range upon attitude control of a pickup.

Abstract: A method and apparatus for assembling an information signal on a rotary recording medium comprising a pre-recorded track recorded with pre-recorded information signals and an unrecorded track not recorded with information signals by use of a light beam in which an information signal to be newly recorded on the rotary recording medium is recorded continuously from the pre-recorded information signal already recorded on the pre-recorded track. The apparatus by use of a light beam searches for a pre-recorded track turn which is a portion of the pre-recorded track immediately preceding the unrecorded track and continuously reproduces the information signal from the searched pre-recorded track turn as it waits for a command signal commanding the recording of the information signal to be recorded.

Abstract: Moving picture signal transmission system, wherein the data-compression is effected for the moving picture by the intraframe-encoding and the interframe-encoding, the signal is divided into the fixed frame-length transmission frame, the transmission frame has the header (A, B, C) which identifies whether it is the first transmission frame, the middle transmission frame or the last transmission frame in one picture frame signal, and then the transmission frame is transmitted, a receiver informs a transmitter of the validity of the received sequence and the result of the error check, when a transmitter receives the error message from a receiver, the picture frame immediately after the message is encoded by only the intraframe-encoding, the succeeding frames are encoded through interframe-encoding, so that the influence of the error is removed within a short time.

Abstract: A disc inclination detecting apparatus comprises a light-emitting element for projecting a light beam on a disc and a light-sensitive element for receiving a reflected light beam reflected by the disc and outputting a corresponding electric signal, in which the light-sensitive element faces the disc and is positioned together with the light-emitting element in a tangential direction of tracks on the disc. The apparatus also comprises a signal processing circuit for detecting, on the basis of the electric signal, a variation of a position of the reflected light beam on the light-sensitive element in a direction perpendicular to the tangential direction. The variation corresponds to an inclination angle of the disc.

Abstract: A disc comprises a recording surface which is divided into a plurality of equiangular sectoral regions and a guide track formed on the recording surface. Each track turn of the guide track is constituted by a row of pits formed in every other equiangular sectoral regions, and the pit is only formed in one of two mutually adjacent track turns of the guide track in each equiangular sectoral region so that the pits are formed in every other track turns in a radial direction of the disc in each equiangular sectoral region.

Abstract: An information recording disc has a control signal such as an address signal pre-recorded on a guide track which is pre-formed on the information recording disc at a position different from a track position where an information signal is to be recorded. An information signal recording apparatus for recording the information signal on such an information recording disc controls a rotation frequency of the information recording disc to a constant rotation frequency by locking a horizontal synchronizing signal within a composite video signal to edges of pulses reproduced from the guide track, and the information signal is recorded on the information recording disc so that a recording interval of the control signal is positioned within a vertical blanking period of the information signal at least including the composite video signal.

Abstract: A rotation control apparatus for a CLV system disc sets an initial value based on an address signal reproduced from the CLV system disc and carries out a rotation control by use of the initial value, so that it is possible to carry out the rotation control even with respect to a CLV system disc on which an information signal is only recorded up to an intermediate position within a program region of the disc. An information signal is newly recordable in conformance with the CLV system from a position in a vicinity of the intermediate position where the previous recording had been discontinued.

Abstract: An information recording disc comprises a guide track, an address signal recording portion arranged in each track turn of the guide track and pre-recorded with an address signal, and a pseudo address signal recording portion arranged in each track turn of the guide track adjacent a corresponding address signal recording portion provided in a track turn of the guide track adjacent thereto. The recording length of the pseudo address signal recording portion is selected approximately equal to the recording length of the corresponding address signal recording portion.

Abstract: A movement of a small picture block in a frame of video signals is provided by recursively applying a gradient method to a picture block in a present frame and a preceding frame to provide a series of sub-movements until said sub-movement decreases less than a predetermined value, and the resultant movement is obtained by the sum of the sub-movements. The present invention provides high accuracy in estimation of movement of a block in a picture as compared with a conventional gradient method, and is attractive in hardware implementation.

Abstract: A frame rate conversion, for instance between NTSC and PAL, or SECAM, has been improved by interpolation system in which an interpolation is performed from picture elements of two consecutive frames of an original picture signal whose positions are shifted from the position of a picture element to be interpolated by amounts related to the move length of a picture block between the two consecutive frames period, instead of using picture elements of two consecutive frames of the original signal that have the same position coordinates as those of the picture element to be interpolated. Picture quality of the converted signal is improved in particular when a picture moves.

Abstract: A disc inclination detecting apparatus comprises a light-emitting element for projecting a light beam on a disc and a light-sensitive element for receiving a reflected light beam reflected by the disc and outputting a corresponding electric signal, in which the light-sensitive element faces the disc and is positioned together with the light-emitting element in a tangential direction of tracks on the disc. The apparatus also comprises a signal processing circuit for detecting, on the basis of the electric signal, a variation of a position of the reflected light beam on the light-sensitive element in a direction perpendicular to the tangential direction. The variation corresponds to an inclination angle of the disc.