Abstract: In order to reduce a crosstalk component contained in a playback video signal reproduced from a recording medium such as a video disc, method and system for recording a video information comprises a step for recording a video signal in a manner that an absolute value of a difference between a cumulative value of the phase of a recording RF signal of each horizontal scanning period of a first section of recording tracks and a second cumulative value of the phase of the recording RF signal of each horizontal scanning period of a second section of said recording tracks adjacent to said section of recording tracks is controlled to a value (2m+1).pi. (m being a positive integer including 0).

Abstract: A device for controlling recording track jump operations includes a tracking servo loop which is activated when a data detecting point is traversed from an initial recording track on a recording disk to a target recording track. Circuitry is provided for accurate compensation in the event of overshooting the target recording track. A jump signal generating circuit may also be provided to reduce the frequency of generated traverse signals from a first frequency level to a second, lower frequency level when the data detecting point is a selected number of recording tracks away from the target recording track, or to gradually reduce the speed which the data detecting point traverses the recording tracks as the data detecting point moves from the initial recording track to the target recording track.

Abstract: A pick-up positioning apparatus for a recording disc playback apparatus such as a video disc player, comprising a control circuit, a memory circuit, a scanning mechanism for moving the pick-up of the playback apparatus along a radius of a recording disc mounted on the playback apparatus, and pick-up sensing circuit for producing signals to indicate the current pick-up position along that radial direction. When a disc is first set on the playback apparatus, the scanning mechanism moves the pick-up along the radial direction to thereby successively read out a number of addresses recorded on the disc, which are stored in the memory circuit together with corresponding position data. Subsequently, to search for a specified address position on the disc, the address stored in the memory circuit which is closest to the specified address is read out and the corresponding stored position data is used in moving the pick-up close to the specified address position.

Abstract: A time base control unit in an apparatus for reproducing recorded information from a disc is provided, which comprises information reproduction processing means for reading and processing the recorded information, disc rotating means, tracking servo means for jumping an information read-spot, sync separating means for separating a sync signal from the information signal read, reference signal generating means, means for detecting a relation between the sync and reference signals and for outputting a phase difference signal, and time base servo means for compensating the time base fluctuation of the reproduction information signal in response to the phase difference signal. The reference signal generating means serves to coincide the phases of the sync signal and the reference signal before and after the jumping operation in order to permit the time base servo control such as spindle servo or tangential servo to be locked-in immediately after the jumping operation of the read-spot.

Abstract: An optical pickup apparatus for reading information recorded on a recording medium, having an optical pickup device and a tilt servo control system for adjusting the angular position of the pickup device, the tilt servo control system comprising a deviation detection means including a light emitting means and a light receiving means, for detecting a deviation of the angle between an axis of the reading light from the optical pickup device and the surface of the recording medium from a right angle and generating a deviation detection signal, and a tilt drive mechanism connected to the optical pickup device, driven by a tilt drive signal generated from the deviation detection signal. The apparatus is characterized by a means for opening the servo loop of the tilt servo system when the light beam from the light emitting means has approached a portion of the recording medium in which no recording tracks are provided.

Abstract: A synchronizing signal separator network for use in an information reproducing system including a time-axis error signal generator, comprising a non-linear impedance circuit to non-linearly modify the amplitude of a supplied composite video signal for suppressing the video signal component of the composite video signal, a differentiating circuit to differentiate the output signal from the non-linear impedance circuit and a slicing circuit to slice off those portions of the output signal from the differentiating circuit which are higher in magnitude than a predetermined level, the output signal from the slicing circuit being used to produce a signal to be compared with a predetermined reference time-axis error signal signal in the time-axis error signal generator.

Abstract: A time axis correction device for a recording medium player such as a video disc player, which device corrects the time axis of at least one component signal of a plurality of component signals contained in a multiplex information-carrying signal which is picked up from a recording medium, in accordance with an error between a reference signal and a pilot signal separated from the multiplex information-carrying signal, so that the time axis correction operation is performed stably.

Abstract: A method and apparatus for recording a color video signal on a recording medium such as video disk in which effects of crosstalk between adjacent recorded tracks are eliminated and the level and phase of the subcarrier signal are maintained constant. The video signal to be recorded is processed so that the phase of the subcarrier signal is constant from frame to frame of the video signal. The video signal thus processed is recorded utilizing an FM modulation system. Specifically, the video signal is separated into a luminance signal and a subcarrier signal. Subcarrier signals to be recorded on adjacent recording tracks are superposed on the luminance signal after processing of the video signal.

Abstract: An information reproducing apparatus for reading and reproducing an angular-modulated information carrier signal which is recorded together with another information carrier signal on a rotating recording disc in a multiplex form comprises pickup means provided in the vicinity of the rotating recording disc for reading the recorded information carrier signals, and demodulating means for demodulating at least the read and angular-modulated information carrier signal. The information reproducing apparatus is further provided with equalizer means between the pickup means and the demodulating means so as to compensate for the frequency characteristics of the pickup means in response to a control signal, and a control signal producing means for producing the control signal representative of the intensity of the extraneous components contained in the angular-modulated information carrier signal which is read by the pickup means.

Abstract: A time axis correction device for treating a signal having a time axis fluctuation, such as a color video signal reproduced from a video disc, includes a phase modulation network whose phase transmission characteristic is dependent on the phase error of the input signal while the amplitude transmission characteristic is constant.

Abstract: A trap circuit is placed in a video signal reproduction path to remove frequency components in the range of the sync signal frequency to thereby eliminate crosstalk. The trap circuit is disabled during the blanking interval and preferably also during complicated portions of the information signal.

Abstract: A metal layer exposed by dry etching a phosphosilicate glass (PSG) layer covering the metal layer is insufficiently reliable when an electrical connection is made by bonding wire to the metal layer or depositing another metal layer on the metal layer. This insufficiency is due to the presence of a phosphorous residue on the surface of the exposed metal layer. The phosphorous residue is preferably removed by treating the surface of the metal layer with an alkaline solution so that the PSG layer, the metal layer, and the semiconductor device in which the connection is made are not affected.

Abstract: A focussing lens servo driving device for an optical information reading device in which the lens is first driven towards the focussed position with a controlling servo circuit operated in an open loop mode. Once the lens has passed a predetermined position an opposition force is produced in dependance on the lens position. The opposition force is gradually reduced and the servo loop is closed when the lens has been turned back to the predetermined position so that stable operation is provided.

Abstract: A tracking servo drawing device in an optical type information reading device utilizes a tracking servo to allow an irradiation light beam to track a record track on an information record surface to read information by using said irradiation light beam illuminating said record surface. A speed detection circuit is used to sense a relative speed of the record track and the irradiation light beam at which the irradiation light beam goes across the video track. When the relative speed is lower than predetermined value, a first detection signal is produced. A signal level detection circuit detects the reproduction signal level of the information. When the level reaches a predetermined value, a second detection signal is produced. When the first and second detection signals are produced simultaneously an instruction signal is generated to close the servo loop of said tracking servo means.