Abstract: A television (TV) signal receiving apparatus displays a TV signal of a high definition system using a TV receiver of an NTSC system with the high picture quality of the high definition system. An A/D converter converts an analog TV signal of a high definition system to a digital signal. A memory stores the digital signal and a vertical filter converts a number of horizontal scanning lines of the TV signal of the high definition system into a number of horizontal scanning lines of a TV signal of an NTSC system. The ratio of horizontal scanning lines of the high definition TV signal to horizontal scanning lines of the NTSC TV signal is 5 to 7. The horizontal scanning lines are divided into three portions in the vertical direction and four portions in the scanning direction and are supplied to twelve CRTs (monitors). The CRTs are arranged in three rows and four columns to form a picture plane.

Abstract: PCM signals belonging to a first reproduction channel and a second reproduction channel and grouped into odd number data and even number data are previously recorded on a recording medium having a plurality of tracks in the form of frames each including at least a set of a first track and a second track. In the operation of reproducing the recorded PCM data, the PCM data reproduced by reproduction heads are stored in accordance with a first control signal, errors in the stored reproduced data are detected in accordance with a second control signal, the numbers of errors are counted, comparison is made between the error number of the odd number data and that of the even number data of the first channel and of the second channel, respectively, and the data which has been judged to include a larger number of errors are replaced by interpolated data and finally the interpolated data are mute-processed at the boundary between adjacent frames.

Abstract: An optical pickup device for supplying a correct focus error signal. The optical pickup device includes a light source for generating a light beam; a recording medium for receiving and reflecting the light beam; and a photo-detector for receiving the reflected light beam from the recording medium and for outputting a focus error signal of the light beam. The photo-detector is divided into at least two regions and includes a reference portion within the at least two regions. When the light beam received by the photo-detector is not within the reference portion of the photo-detector, a portion of the light beam is not detected by at least one of the at least two regions, thereby supplying a correct focus error signal.

Abstract: A magnetic head device is disclosed which comprises: a head tip including a pair of cores which are confronted with each other in such a manner that the cores are sufficiently spaced away from each other with a magnetic gap fored at one end; a bridge core bridging the pair of cores to allow a magnetic flux to flow out of one of the pair of cores and flow in the other core; and a coil placed in the path of the magnetic flux.

Abstract: A system for detecting an excessive loading condition of multiple disks in an optical disk reading apparatus. In the system, a parking position of a pickup is established at a predetermined position between respective outer circumferences of a first large-diameter disk and a second small-diameter disk. Upon application of a predetermined input for initiating a reproduction operation, a focusing servo is locked-in or initially focused at the parking position. The pickup is then moved to a lead-in region which is at an inner circumference of the first disk. If the lock-in of the focusing servo is released (i.e., a substantial variation in focusing is sensed) during movement of the pickup, a predetermined operation amounting to an alarm indication is performed to indicate that there is an excessive loading condition of multiple disks in the video disk apparatus.

Abstract: An optical information recording disk is formed by a pair of disk-like substrates with an inner and an outer annular spacer member disposed therebetween. The inner spacer member supports an inner circumferential portion of each of the disk-like substrates, and the outer spacer member supports an outer circumferential portion of each of the disk-like substrates. The spacer members and substrates thus define an interior space. The spacer members and substrates are fixed together by means of a thermosetting adhesive agent. A notched portion is formed in at least one of the space members so as to communicate the interior of the disk with the ambient atmosphere. Thus, during heating of the disk for purposes of joining the substrates and spacers by hardening the adhesive agent, air in the interior space in the disk can escape through the notched portion. After heating, the notched portion is filled with a sealing member such as a solid member or another adhesive agent.

Abstract: A sync signal detecting device includes a circuit for generating a sync signal pattern corresponding to an expected sync signal pattern contained in a digital signal, a circuit for comparing the digital signal with the sync signal pattern to detect a sync signal in the digital signal, a circuit for detecting errors in the digital signal, and a counter for counting the errors thus detected. A sync detection signal is outputted when, where no error is detected, the sync pattern is detected, and when, where errors are detected, the number of errors detected is a predetermined value or less and the part of the digital signal which is not coincident with the sync signal pattern is the part where the errors have been detected.

Abstract: A rotary head type magnetic recording and reproducing device in which sub-code data can readily and accurately be read from an inclined track recorded on the tape when the tape is moving at a high speed in either direction. The rotational position of the rotary head is sensed. When the head is at a predetermined angular position, its rotation is stopped by a brake mechanism. The sub-code data is then reproduced from the tape.

Abstract: A front-loading record player comprises a slide base carrying thereon a turntable and movable back and forth with respect to a player cabinet; a driving cam including a front slant retainer section and a rear linear section, the linear section extending in parallel with the moving direction of said slide base and the driving cam being provided on said slide base; a guide cam including a front recess portion and a rear linear portion, the linear portion extending in parallel with the moving direction of the slide base and the guide cam being provided on the player cabinet; and a front door opening/closing drive member for opening and closing a front door of the player cabinet, the drive member being held between the driving cam and the guide cam. The front door opening/closing drive member and the front door are drivingly coupled to each other.

Abstract: A moving-coil type phono pickup cartridge in which undesirable resonances are eliminated and a vibrating unit is maintained in alignment with a predetermined center position of a magnet unit. A first non-magnetic body has a mount portion and a support portion extending perpendicularly to the mount portion. The support portion has a longitudinal hole formed therein which is intersected by a slit. A screw tightens and loosens a vibrating unit disposed in the hole by adjusting the gap width of the slit. A magnet unit is secured with a screw to the first body with a center pole piece thereof confronting a center of coils of the vibrating unit.

Abstract: A disc loading mechanism includes a rotatably and linearly movable tray onto which the disc is inserted and positioned, and a cam mechanism driven to lower the disc onto a turntable and separate the tray from the disc.

Abstract: A data-dependent code word consisting of redundancy bits marks a boundary of a multi-bit cell, and is coded to bear a mapping relationship to a data block within the cell. Embodiments using the data-dependent code word provide various types of synchronization, and provide for simplifying an error-correction task.

Abstract: An input signal level control device for a receiver particularly adapted for use in a mobile FM receiver in which the received electric field strength changes abruptly and greatly. An attenuating device such as a switching diode is coupled to an input of a high frequency amplifier to which the input received signal is fed. The attenuating device switches on when the received electric field strength reaches the first predetermined value. As the electric field strength continues to increase and reaches a second value greater than the first, a control circuit controls the gain of the high frequency amplifier in accordance with the electric field strength.