Abstract: A synchronization system for multiple CD players (12), (14), (16) and (18) includes a controller (20) that generates four separate sampling frequencies for input to the word clock inputs of the CD players. A master word clock provides a master clock signal that is input to CD player (12) and then multiplied by multiplier (40). The output of multiplier (40) is divided down by variable dividers (48), (50) and (52) to provide the sampling frequencies for the remaining CD players (14), (16), and (18). Each of the disks (54) has a header (80) disposed on the beginning of each of the program tracks. This header has a unique synchronization signal associated therewith that outputs data corresponding to the position of the output digital data. During output of the data associated with the header, a difference between positions of the different CD players is determined.

Abstract: Method of recording and reproducing picture information and a recording medium on which the picture information is recorded by the method, and an apparatus for playing such a recording medium. In addition to a coded information signal, graphic codes including picture information occupying N (N being a natural number equal to or greater than 2) channels and inserted as the subcode of the coded information signal are recorded on the recording medium. One of the graphic codes which occupies one of the N channels consists of at least a code train group obtained by arranging consecutively a plurality of code trains which relate to a series of information obtained by said coded information signal and include picture information of the same picture. At the time of playing of the recording medium, only one of the graphic codes occupying the one of said N channels is stored in a memory in response to a command and a picture signal corresponding to contents stored in the memory is generated.

Abstract: In an information signal reproducing apparatus having a reproducing head for reproducing information signals from recording tracks formed on a record bearing medium and a shifting device for shifting the reproducing head athwart the tracks, the shifting device is arranged to be operatable in a first operating mode in which the reproducing head is shifted to a predetermined extent for every first predetermined period and also in a second operating mode in which the reproducing head is shifted to the predetermined extent for every second predetermined period which is longer than the first period. The shifting device is controlled not on the basis of the output of the reproducing head in the first mode but on the basis of the output of the reproducing head in the second mode.

Abstract: A method for recording and reproducing information, including plural channel audio signals on and from a recording medium. A sampling operation at a predetermined sampling frequency is respectively performed against plural channel audio signals, a modulation operation of a predetermined modulation system is performed respectively for each of a plurality of channels of the sampled data, an identification code identifying each channel is added to each of plural channel coded information signals, and subsequently the coded information signals are multiplexed by a time division multiplexing operation and recorded on the recording medium, together with one channel analog audio signal or by themselves.

Abstract: An optical disk player using quadrant type photodetector as light receiving means. The phase difference output by the time difference detection method is issued as a tracking error, and a DC component of differential output by the push-pull method is issued as a tilt error, and zero cross of said differential output is detected. By using this detection output for the detection of zero-cross timing on off-track, stable operation of the tracking servo unit is ensured.

Abstract: A track seeking control apparatus includes an optical head for generating a signal comprising a train of track cross pulses when it crosses tracks on a recording medium. A first counter counts the train of track cross pulses generated by the optical head, and produces a signal representative of a count value of the first counter. A signal generator generates a signal of a frequency varying proportional to a frequency of the track cross pulse signal. A second counter counts the train of track cross pulses generated by the optical head, based on the output signal of the signal generator, and produces an output signal when a count by the second counter reaches a desired value. A second pulse generator outputs to the first counter a correcting pulse for correcting the count value of the first counter, in response to the output signal produced by the second counter.

Abstract: A device for processing optical data comprising:an optical waveguide formed on a substrate,a light source for the laser beam to be admitted into the waveguide,lens means provided on the waveguide for causing the beam propagating through the waveguide to emerge obliquely upward and focusing the emergent beam two-dimensionally,means for receiving the beam reflected obliquely from above,a base provided with the laser light source, the substrate and the light receiving means,a focusing drive mechanism for adjusting the position of the base upward or downward, anda tracking drive mechanism for adjusting the position of the base laterally.

Abstract: An apparatus and system for the controlled delivery of a subliminal video and/or audio message on to a source signal from a video tape player or similar. The source signal is divided into audio and video portions. A video processor reads sychronization information from the source signal. A controller transmits a stored subliminal image at designated times to a mixer amplifier fully synchronized with the source signal. Concurrently, an audio subliminal message is applied to the source audio at a volume level regulated at some fraction to the source audio. The combined signals are transmitted to a monitor for undistracted viewing.

Abstract: A composite disk playing method according to which, at the time of playing a disk, identifier data are read out, a signal is read out from a multiplex recording area to reproduce and output a predetermined one of an analog video signal and a digital video signal when it is determined in accordance with the identifier data that the type of the disk to be played is a composite disk on which the analog video signal and the digital video signal have been recorded, and subsequently a signal is read out from the multiplex recording area to thereby reproduce and output the other signal. In playing a composite disk, therefore, longer disk playing becomes possible automatically.

Abstract: In a rotating head type reproducing apparatus of the kind reproducing an information signal using rotating heads from a record bearing medium on which a plurality of pilot signals of different frequencies are recorded in rotation along with the information signal, one in every recording track in a predetermined sequence, the levels of pilot signals reproduced from mutually adjacent tracks by a first rotating head are compared with each other; and the result of comparison is used in detecting the tracking error of a second rotating head which is reproducing the information signal.

Abstract: The control and detection of a laser beam for an optical disc recording/reproducing apparatus in which the intensity of a return laser beam reflected by an optical recording medium of a recording laser beam used for forming pits and recording data on the recording medium during the recording mode is detected and an error signal including focusing and tracking error signals of the recording laser beam is formed on the basis of a detection output of the intensity of the return laser beam within a predetermined time interval before the pit starts to be formed by the recording laser beam on the recording medium to control the recording laser beam, and in which, when recording data on the optical recording medium having sub-data previously recorded thereon as pre-grooves with wobbling, these sub-data are detected on the basis of the detection output of the return laser beam within said predetermined time interval or within a predetermined time interval other than said predetermined time interval.

Abstract: An optical information processing apparatus which includes a substrate of a transparent material, first and second optical waveguides formed on opposite faces of said transparent substrate, a light introducing device for introducing reflected light from an information writing medium into the first and second optical waveguides, and a detecting device for detecting a reproduction signal, tracking error signal and focusing error signal based on the reflected light introduced into the first and second optical waveguides.

Abstract: A laser beam from a laser source is incident on a track of an optical card through an objective lens. Since the optical card is reciprocated along a track direction, the laser beam is scanned on the track. The light beam reflected by the optical card is guided to a photo-detector through the objective lens and a mirror. An objective lens actuator and an objective lens position sensor are arranged near the objective lens. The objective lens actuator performs tracking of the laser beam by moving the objective lens in a direction perpendicular to the track, and focuses the objective lens by moving it in a direction perpendicular to the optical card. The lens position sensor detects the displacement of the lens during tracking. A track-error signal generated from the photo-detector is supplied to the actuator through a phase compensate circuit and a power amplifier, thus performing tracking servo control. An output from the lens position sensor is supplied to an off-track detector.

Abstract: An automatic control method for home appliances using a video tape recorder and a device thereof are disclosed, in which the device comprises one or more power source control means, a home automatization mode designation means, and a microcomputer; and the method comprises: a step of appointing power supply starting times and power supply ending times for the respective passively controlled apparatuses; a step of supplying the power source upon arrival of the power source supply time for a particular apparatus; and a step of disconnecting the power supply from a particular apparatus upon arrival of the power supply blocking time. According to the present invention, as many automatic controls of home appliances as the record-capable number of the programmed recordings of broadcasting programs are possible, and it is possible to use a part of the function for programmed recordings of broadcasting programs, and to use the remaining part of the function for automatic controls of home appliances.

Abstract: An optical pick-up device for focusing a laser beam emitted from a light emitting element through an optical system onto a recording medium. The beam is reflected from the recording medium and redirected through the same optical system on to a photodetector. A tracking error signal and a focusing error signal are produced from the output signals of the photo-detector. A diffracting element positioned before the light emitting element and the photo-detector and produces two sub-spots in two directions for applying the so-called 3-spots method from the laser beams that were projected from the light emitting element toward the recording medium. The diffracting element is divided into a first sub-region and a second sub-region formed in the same place and defined by a parting line aligned substantially perpendicular to the track direction. The first sub-region includes a diffraction grating for diffracting three beams that comprise a main beam toward the recording medium.

Abstract: An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, so that many optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.

Abstract: An apparatus in accordance with the present invention sequentially fixes the wavelength of a light beam irradiated from a light source whose oscillation wavelength sequentially varies to a plurality of different wavelengths to a recording medium to required wavelengths each capable of forming a hole at absorption spectrum of the recording medium, synchronizes timing of change of the wavelength of the light source with timing of recording or regenerating each bit of information, records the optical hole formed in a manner that each bit of information corresponds to the wavelength varying in sequence, and detects the formed hole to regenerate information.

Abstract: A system for processing video signals to produce slow motion television pictures is disclosed. A sequence is produced of output frames at broadcast rate by combining a decreasing proportion of pixel values of a first frame (i) stored in a first frame store with an increasing proportion of fixed valves of a second frame (i+1) stored in a second frame store. On completing a cycle the second frame (i+1) is treated as the first frame and a new second frame (i+2) is provided from a third frame store.

Abstract: Prior to emitting a light beam from an optical head, an information recording apparatus moves the optical head in the direction of the optical axis so as to render the light beam in a defocused state on an optical recording medium. Then, the size of the emitted light beam is detected by a detector.

Abstract: The invention relates to a reproducing apparatus for reproducing digital signals. The apparatus comprises means for detecting the recorded data from the medium and generating digital data signals corresponding of the recorded data having a first predetermined bit rate, expansion means for converting the digital data signals from the detecting means into expanded digital signals having a second bit rate lower than the first bit rate, and means coupled to the expanding means for extracting the portions of the expanded digital signals corresponding to the synchronous words. Thus, it can be to provide a compact magnetic recording and reproducing apparatus which is more reliable, and less costly to manufacture, utilizing a lower working speed synchronous detector.