Abstract: An optical disk reproducing apparatus for reproducing at a high access-speed an optical disk on which data has been recorded at a constant linear velocity (CLV) includes a control circuit for controlling reading of the disk recorded at a CLV to be rotated at a constant angular velocity (CAV), and a processor for changing the frequency of a reference clock to determine the processing timing of the reproduced digital signal in accordance with a transmission speed of the digital information signal picked up from the disk. A motor for driving the disk can be rotated at a constant revolution rate upon access to the disk, and thus it is possible to remove one of the factors for determining the access time in the conventional CLV type reproduction system, or the time for controlling the motor to rotate for a constant linear velocity in accordance with the position of the optical pickup.

Abstract: A semiconductor device functioning as a diode, includes an insulated-gate field effect transistor for determining a breakdown voltage, and a bipolar transistor connected to the field effect transistor for amplifying a drain current of the field effect transistor. The field effect transistor and the bipolar transistor are formed in the same semiconductor substrate.

Abstract: A magnetic recording method and apparatus which performs a quadrature phase shift keying operation on a digital information signal, superimposes a high frequency bias signal on the performed signal, records the resulting signal into a deep portion of a magnetic layer of a magnetic tape with a first rotational head, and records a video signal in a surface portion of the magnetic layer above a track formed by the former recording, with a second rotational head which is different in azimuth angle from the first rotational head, the frequency of the high frequency bias signal being set to a value which is about four times as high as the carrier frequency of the quadrature phase shift keyed digital information signal, thereby eliminating a 5th-order distortion component due to cross modulation of the high frequency bias signal and the carrier frequency.

Abstract: A recording method is provided for a video tape recording apparatus having modes for recording PCM audio signals in a plurality of transmission rates. Index codes for a video signal, which enable a search reproduction and so on, are recorded on a video tape in a constant transmission rate irrespective of the transmission rate of a PCM audio signal to be recorded. Further, an amble pattern at the same frequency as the transmission rate of the PCM audio signal is recorded immediately behind the PCM signal recording area. A reproducing apparatus may be provided only with an index detecting circuit corresponding to the constant transmission rate.

Abstract: A road surface specially designed to enhance skidding includes an asphalt mixture containing a plurality of substantially spherical coarse aggregates, said aggregates having a randomly continuous shape on their upper surface. A method to provide this surface involves replacing a road having an asphalt coating with the road surface of the present invention.

Abstract: A digital signal recording method and apparatus for recording first digital data and second digital data on a writable disc without an interleave discrepancy therebetween. The first digital data is previously recorded and the second digital data is at least one of overlapped and joined with the first digital data on a writable disc so that no interleave discrepancy occurs.

Abstract: A magnetic recording/reproducing apparatus is provided which includes a head structure compatible with a long-time play mode in handling either of two kinds of signals containing different amounts of information, such as a current digital picture signal and a high-definition (HD) digital picture signal in the rate of two to one at a constant number of revolutions of the drum by restricting an increase of the number of heads. In an aspect of the apparatus, four heads are arranged on the rotating drum equally 90.degree. spaced, a fifth head of an opposite azimuth is mounted close to any of those heads, the number of drum revolutions is increased to twice larger than the normal number, the current digital picture signal is recorded and reproduced for each channel by using two heads, that is, the fifth head and a head positioned 180.degree. opposite to the fifth head.

Abstract: A segmentation system in which, in recording a PCM audio signal on a magnetic tape or the like, a signal divided in 5 per field is divided into 4 segments per field with high capabilities of error correction and a mean value interpolation for burst errors etc. Regarding the signal of a deep-layer record PCM format, in which each subframe (3 in FIGS. 1(a)-1(c)) is formed of 30 blocks of only even data or odd data and in which data frames (4) each including 1 subframe of the even data and 1 subframe of the odd data in combination are formed in the number of 5 per frame, the even data items are arranged in the first half part of a PCM record area on the tape, and the odd data items in the latter half part.

Abstract: In an information recording/reproducing apparatus for recording/reproducing a digital audio signal on/from a magnetic medium, a modulator/demodulator for modulating/demodulating the digital signal by offset quadrature phrase shift keying (O-QPSK). This technique is particularly applicable to the multi-layer recording of video and audio signals in a video tape recording/reproducing system and has the advantage of avoiding interference between the recorded digital audio and video signals at the time of reproduction.

Abstract: Disclosed is a PCM signal reproducing/recording apparatus which comprises a reproducing device for reproducing a recording medium carrying PCM data and sub-code data recorded thereon, the sub-code data having sub-data and sub-ID for adding auxiliary information to the PCM data, and a recording device for recording the PCM data and sub-code data transmitted from the reproducing device onto a recording medium. The recording device is arranged to selectively record the sub-code data judged to be correct, onto a recording medium, of those sub-code data transmitted from the reproducing device.

Abstract: Disclosed is a PCM signal reproducing/recording apparatus which comprises a reproducing device for reproducing a recording medium carrying PCM data and sub-code data recorded thereon, the sub-code data having sub-data and sub-ID for adding auxiliary information to the PCM data, and a recording device for recording the PCM data and sub-code data transmitted from the reproducing device onto a recording medium. The recording device is arranged to selectively record the sub-code data judged to be correct, onto a recording medium, of those sub-code data transmitted from the reproducing device.

Abstract: A method of preparing a paper having a reinforced strength wherein a polymer latex is added to a paper stock in an amount of from 2.5 to 30% by weight. The polymer latex is prepared by neutralizing a seed polymer with an acid or a salt or by quaternizing it with a quaternizing agent. The surfaces of the emulsion grains are provided with a large number of cationic groups. The seed polymer is formed by adding a monomer represented by the following formula (I) or a mixture of the monomer (I) and copolymerizable ethylenic unsaturated monomer(s) (II) to a seed latex of a carboxyl-modified synthetic rubber latex or synthetic resin emulsion and polymerizing them: ##STR1## R.sub.1 represents H or CH.sub.3 ; R.sub.2 represents an alkylene group having from 2 to 5 carbon atoms;R.sub.3 and R.sub.4 each represents H or an alkyl group having from 1 to 5 carbon atoms;A represents ##STR2## and R.sub.1, R.sub.3 and R.sub.4 are so selected that the monomer is hardly soluble or insoluble in water.

Abstract: An offset compensation circuit for compensating a DC offset which occurs in a circuit line including an A/D converter or an A/D and D/A converter in which not only the polarity bit of digital data but also information concerning the amplitude of an analog input signal are applied to an integrator to precisely compensate an offset voltage in a circuit line. The level of a proper offset compensation voltage is provided even when an input analog signal such as a music signal is absent, and when an A/D and D/A converter is provided which can perform both A/D conversion and D/A conversion the DC offset can be precisely compensated shortly after the change of the mode from D/A conversion to A/D conversion.

Abstract: A PCM signal processing apparatus for recording or reproducing a PCM signal. The PCM signal reproducing apparatus of the invention is constituted by: a data addition circuit for receiving a first signal composed of n bits per word (n being an integer) and a second signal composed of n' bits per word (n' being an integer) as mode inputs different from each other, and for adding fixed data of (n-n') bits to every word of the second signal to thereby generate a third signal; a first switch device for receiving the first and third signals and for selectively outputting one of the first and third signals; a symbol generation circuit for converting every word of the output of the first switch device into symbol data of m.times.

Abstract: A digital signal recording/reproducing apparatus for enabling recording/reproduction at variable speeds including normal speed, and at least one of N-times normal speed and 1/N-times normal speed while maintaining the reproducing frequency constant so as to not require switching of analog circuits. At the time of reproduction at normal speed, N-times normal speed or 1/N-times normal speed, the feed speed of the magnetic tape and the timing of picking up of a reproducing signal from the magnetic tape are varied while the speed of revolution of a cylinder of a rotary head is maintained constant so that the timing of detection of pilot signals for generating a tracking error signal is varied to cope with difference in track scanning conditions in recording and reproducing modes.

Abstract: A PCM audio signal recording and reproducing apparatus samples an audio signal with a sampling frequency having an asynchronous relation to a field frequency of a video signal; converts it to a PCM signal, adds error detection/correction data to a predetermined number of PCM data, forms a data frame by those signals, modulates it in accordance with a predetermined modulation system, and records the audio signal together with the video signal or just the audio signal on a record medium by using a rotary head type scanner which is controlled so as to have a synchronous relation to the field frequency of the video signal. A digital signal processing circuit having a memory of a predetermined capacity is provided, and the number of digital data to be recorded in one data frame is varied in accordance with a difference between the number of input data of the digital audio signal to the digital signal processing circuit and the number of output data supplied to the record medium for recording.

Abstract: A disabled transferring device comprises a stationary base and a rotary base coupled with the stationary base for forming a base assembly. An actuation lever assembly which has an actuation lever having a pivot point in the vicinity of one end and an actuation point at the other end, is pivotally supported on the rotary base of the base assembly. A pivotal support shaft is secured onto the level in the vicinity of the pivot point in such an arrangement that the securing point of the pivotal support shaft is oriented at the pivot point or between the one end and the pivot point with a first distance to the pivot point of the lever. The first distance is much shorted than a second distance between the pivot point and the actuation point. A saddle to mount thereon the disabled is mounted on the top end of the support shaft.

Abstract: The present invention relates to an apparatus for recording a digitized signal. If a recording apparatus is switched from a recording mode to a non-recording mode and then switched from the non-recording mode to a recording mode, there is produced a portion between two records where the records are not continuous. When such a portion is reproduced, abnormal data come to be reproduced because of existence of discontinuity between the prior and subsequent data. And, if a digital audio signal is similarly recorded, it follows that an abnormal sound is generated when such a portion is reproduced. Then, by recording an anti-format signal in the discontinuous portion, the reproduction of abnormal data or generation of abnormal sound can be prevented from occurring.

Abstract: First to third memories store a plurality of functions constituting polynomials respectively representing at least one-line luminance, chrominance, and sync signal waveforms included in a television testing signal to be generated and a plurality of parameter values for defining the plurality of functions. First to third expansion sections receive the functions and parameter values of the respective signal waveforms from the first to third memories so as to calculate the magnitude values of the respective signal waveforms for the corresponding time base postions. Fourth to sixth memories receive the outputs from the first to third expansion sections so as to store the magnitude values of the respective signal waveforms at the corresponding time base positions for at least one-line data of the television testing signal to be generated.

Abstract: An integration type D/A and A/D converter having improved linearity and low power consumption. Logic circuits such as ECL counters consuming a major part of power of the D/A and A/D converters are realized through CMOS process. Current source circuits, current switch circuit and comparator circuit of the integration type A/D converter are realized in IC through bipolar process ensuring high accuracy and low noise. Logic parts such as counter is realized through CMOS process.