Abstract: This invention relates to an information signal recording apparatus which can be used also as an audio tape recorder only. When it is used only as the audio tape recorder, an audio signal is sampled with a frequency m times the sampling frequency of an audio signal which is used upon recording a video signal and the thus sampled PCM digital audio signal is diffusively recorded on at least two recording intervals thereby to improve the tone quality of the audio signal and the compatibility with the audio tape recorder using a video tape recorder of the same kind can be established.

Abstract: In an apparatus for recording and/or reproducing, in successive slant tracks on a record tape, an information signal comprised of at least an audio signal and an index signal for use in controlling transportation of the tape; the input audio signal is converted to a digitized form in which the audio data for a predetermined length of time is grouped as a plurality of data blocks which are recorded by a rotary head in a first part of a respective slant track on the tape, an index signal generator provides a coded index signal to indicate respective input information, such as, an absolute tape-position address counted from a predetermined reference position on the record tape, an index area signal is generated in predetermined timed relation to scanning by the rotary head of said first part of each slant track, and a control is responsive to the index area signal for supplying the coded index signal to a rotary head for recording by the latter in a second part of said respective slant track which is located adj

Abstract: Disclosed is a road surface heating vehicle as well as a gas supply system therefor. The vehicle is provided with heating panels and a gas tank. It further comprises a plurality of vaporizers connected in parallel to each other by a gas line and a liquid line. The gas line is connected to the heating panels via its branch lines. The gas and liquid lines are each mounted with a solenoid valve and a pressure adjusting valve. The gas tank is equipped with necessary instruments involved, the vehicle having a body equipped with an operating board containing a microcomputer which automatically makes its control operation based on the use of the associated members, in such a way as to keep the gaseous pressure to fall within a specified range of levels. The system comprises members corresponding to the above-mentioned members constituting the vehicle, including a microcomputer adapted to automatically control the gaseous pressure so that the same may be kept within a specified range of levels.

Abstract: In a reproducing and recording or dubbing system there are provided a reproducing apparatus for reproducing from a first tape recorded composite data which includes pulse code modulated information data mixed with control data having first and second states for indicating that re-recording of the associated information data is to be prevented and permitted, respectively, a recording apparatus for recording on a second tape composite data reproduced from the first tape, a detector for detecting the states of the control data in the composite data reproduced from the first tape, a generator for generating a dubbing protect control signal in response to detection of the first state of the control data, a line for transmitting the reproduced composite data from the reproducing apparatus to the recording apparatus, and a switch interposed in the line for transmitting the reproduced composite data and being operated by the dubbing protect control signal to interrupt the transmission of the reproduced composite data

Abstract: A method and apparatus for recording and reproducing an information signal comprised of a video signal and an audio signal in a plurality of successive parallel tracks on a magnetic tape, each track including a first audio section followed by a video section, by converting the audio signal into a PCM digital audio signal; compressing the PCM audio signal; frequency modulating the compressed PCM audio signal to produce an output PCM audio signal; and recording the output PCM audio signal and the video signal in the plurality of successive tracks such that one field interval of the video signal is recorded in the video section of each track and the output PCM audio signal corresponding to one field interval of the video signal is recorded in the audio section of each track and corresponds to the video signal in the leading portion of the previous successive track and the video signal in the trailing portion of the previous alternate track, wherein the audio signal recorded in each track is delayed by a maximum

Abstract: A system and apparatus for helically scanning a magnetic tape having slant tracks wherein the slant tracks are divided into a plurality of segments. A helical scan drum has at least first and second rotary head pairs. The first head pair scans at least one of the segments of a first track while the second head pair simultaneously scans at least one of the segments of the second slant track of the magnetic tape. This system is particularly useful for utilizing a tape for portable audio use wherein the same tape is also useful for video applications.

Abstract: In a helical scan apparatus having a rotary head or heads for recording and/or reproducing video and audio signals in oblique tracks on a magnetic tape with the recorded audio signals being recorded in overscan areas of the oblique tracks and with the pitch of the tracks being different as a result of changes in the tape speed for different recording modes; index signals are recorded by the rotary head or heads at predetermined positions in the overscan areas of a plurality of the oblique tracks for a period of time dependent upon the recording mode previously used for recording the video and audio signals. Therefore, in a program search operation employing high speed playback, the index signals can be extracted from the output of the rotary head or heads for identifying a respective program or event irrespective of the recording mode with which the video and audio signals were recorded.

Abstract: A method and apparatus for selectively compensating burst errors of variable length in successive data words. Correct and erroneous data words are identified, and the presence of one of the following error conditions is sensed: (a) an erroneous data word preceded and followed, respectively, by correct data words; (b) plural successive erroneous data words preceded and followed, respectively, by correct data words; and (c) a predetermined number of successive erroneous data words preceded by a correct data word.

Abstract: A system for use in recording/reproducing video and audio signals, where the audio signals to be recorded can consist of various kinds of signals such as stereo signals, bilingual signals, or monaural signals, in which the kind of audio signal that is present in the signal to be recorded is detected and a corresponding code is added to the audio signal prior to being encoded and recorded. During playback, the particular code is detected and used to control switches to select the corresponding proper audio reconverting system based on the detected code.

Abstract: A video signal recording apparatus of the type that records a coded audio signal through time division relative to a video signal at one extended end of each of oblique tracks formed on a magnetic tape by helical scanning. The apparatus comprises a circuit for recording a coded video signal in the track region where a coded audio signal is recorded, and a circuit for recording identification data to discriminate between the coded audio signal and the coded video signal on the magnetic tape or recording control data thereon to control playback modes of the recorded signals.

Abstract: In the recording/reproducing of digital audio signals, errors are detected and corrected by using two parity words, one arranged at the center of the block formed of data words and the arranged at one end of the block. The probability that uncorrectable error will be present in the center of the block is relatively high, so placing the parity word there prevents loss of the more valuable data. Maximum correctable burst errors are determined by the length of the block, so placing the other parity word on the end of the block lengthens it and improves burst error correction. The parity words are arranged as indicated before adding a cyclic redundancy check (CRC) code to the data signal and then modulation coding the signal before recording. During playback, the reproduced signal is demodulated and the CRC code used to detect errors for which error pointers are generated.

Abstract: Information is digitized, and the digital information signals are used to produce frequency modulated signals the instantaneous frequency of which is a function of the content of the digital information signals. The frequency-modulated signals are recorded in alternate tracks with alternate recording heads having air gaps of different azimuth angles. In one embodiment, the recording heads are the rotary heads of a VTR, and the digital information signals are digital audio signals which are recorded in the same tracks as the usual video signals.

Abstract: Apparatus for recording and reproducing an information signal comprised of a video signal and an audio signal in a plurality of successive tracks on a magnetic tape, includes a recording section comprised of a PCM processor which converts the audio signal to a PCM audio signal and compresses the same, a dummy signal generator for compensating for tape jitter by generating a dummy signal and supplying the same to the PCM processor where the dummy signal is added both before and after each portion of the compressed PCM audio signal to be recorded in an overscan section of each track, and a magnetic head assembly which records the video signal in a main section of each track and each portion of the compressed PCM audio signal and dummy signal added thereto in the overscan section of each track; and a reproducing section comprised of a magnetic head assembly which scans the tracks to reproduce the information signal recorded therein, a switch assembly which separates the video signal reproduced from the main sect

Abstract: A reproducing section of a helical scan VTR for reproducing a color television signal recorded in a plurality of successive parallel tracks on a magnetic tape and comprised of a video signal and at least one of a frequency-modulated audio signal and the combination of a PCM audio signal and run-in signal, with the video signal and frequency-modulated audio signal being recorded only in a main section of each track and the PCM audio signal being recorded only in an overscan section of each track, the VTR including a pair of magnetic heads which scan the tracks to reproduce the information signal recorded therein; a pair of switch circuits connected to the heads and which separate the information signal reproduced during scanning of the main section of each track and a signal reproduced during scanning of the overscan section of each track; a detector which detects the presence or absence of a run-in signal from the separated signal reproduced during scanning of the overscan section of each track and produces a

Abstract: Apparatus for recording and reproducing an information signal comprising at least an analog audio signal in a plurality of successive tracks on a magnetic tape includes a PCM processing circuit for converting an analog audio signal into a PCM audio signal; a video signal processing circuit for processing a video signal to produce an output video signal; a rotary magnetic head assembly for recording the output video signal and the PCM audio signal in the plurality of successive tracks on the tape; a switch assembly for supplying the output video signal and the PCM audio signal to the rotary magnetic head assembly; and a control circuit for controlling the switch assembly to supply the output video signal and the PCM audio signal to the rotary magnetic head assembly during a video use mode so that the latter records the output video signal in a main section of each track and to supply only the PCM audio signal to the rotary magnetic head assembly during an audio use mode so that the latter records the PCM audio

Abstract: In a magnetic recording and/or reproducing apparatus of the kind in which the azimuth angles of recorded signals in adjacent tracks on a magnetic recording medium are made different with each other so as not to require a guard band and having a rotary head assembly including at least a pair of magnetic transducing heads, each having the head width larger than the track width, when a portion of an audio signal on the magnetic medium is re-recording, an identification information signal is recorded on a predetermined track in connection with the first or last track for which the re-recording is required so that signal deterioration and noise caused by track width fluctuation or variation is compensated for.

Abstract: Apparatus for reproducing an information signal comprised of a video signal, a PCM audio signal and four pilot signals from a plurality of parallel tracks extending obliquely on a magnetic tape, the video signal and one of the pilot signals being recorded in a field section of each track and the audio signal being recorded in a subsequent overlap section of each track, the four pilot signals being recorded in successive tracks, the apparatus including first and second rotary magnetic heads for scanning the tracks to reproduce the information signal, both heads being in reproducing contact with the tape during reproduction of the audio signal by one of the heads; four band-pass filters for separating the pilot signals, respectively, from the reproduced information signal, a selector circuit for selecting two of the pilot signals reproduced as cross-talk pilot signals from tracks adjacent to the track being scanned; AM detectors for detecting the levels of the cross-talk pilot signals and producing two error de

Abstract: A digital servo circuit which comprises a first N-bit counter for counting clock pulses at a recurrence frequency corresponding to error data and a second N-bit counter for counting divided recurrence frequency clock pulses at 1/M times the aforementioned recurrence frequency. The digital servo circuit controls the pull-in operation of a servo system with the count output of the second N-bit counter as control data, while it controls the operation of the servo system in the normal phase-locked state thereof with the count outputs of the first and second N-bit counters as control data with the count output of the second N-bit counter changed according to the amount of external disturbance caused to the servo system.

Abstract: A digital capstan servo circuit controls the rotation of a capstan motor used for sending a recording medium of a recording apparatus having a recording circuit for recording a plurality of pilot signals instead of CTL signals used for a tracking servo of the capstan motor in a reproducing mode. The pilot signals have different frequencies respectively and are recorded under being mixed with a video signal on video tracks. In the recording mode, a rotation speed information obtained from a counter of which a counting value is latched by a latch pulse produced from FG signals which are generated synchronously with the capstan motor and a rotation phase information obtained from the counter of which a counting value is latched by a latch pulse produced from an oscillator, an output signal of the oscillator having the same frequency as that of but a different phase from as that of the FG signals, are mixed to be a control signal of the capstan motor.

Abstract: Apparatus for recording and reproducing an information signal comprised of a video signal and an audio signal in a plurality of tracks extending obliquely on a magnetic tape includes a sample and hold circuit, an analog-to-digital converter and an encoder for converting the audio signal to a pulse code modulation (PCM) audio signal; a time base compression circuit for compressing the PCM audio signal; and two rotary magnetic heads for recording the compressed PCM audio signal in the plurality of tracks, each of the tracks being divided into a first leading audio track section, a contral video track section and a trailing audio track section, with the two heads recording one field interval of the video signal in the central track section of each track and recording the audio signal corresponding to one field interval of the video signal recorded in an adjacent track, in the first and second audio track sections of each track such that odd samples of the audio signal are recorded in each first leading audio tra