Abstract: A phase locked loop is disclosed in which a digital audio signal is recorded in synchronism with a video signal and a sampling frequency of the digital audio signal is reproduced in reproduction mode. A frequency divider of the phase locked loop comprising a phase comparator a low-pass filter, a VCO and a frequency divider unit is switched by the number of the digital audio signal recorded for each vertical sync period (or 1/N thereof) of the video signal, so that a sampling frequency of the digital audio signal having no relationship of integral ratio with a vertical sync frequency Fv of the video signal is reproduced from the same frequency Fv. The reference input to the phase comparator is delayed by a predetermined time in accordance with the number of the digital audio signal, with the result that the sampling frequency reproduced has no period error to the extent that the reference input has no period error.

Abstract: Image data is recorded in successive turns on a rotatable record medium driven at substantially constant linear velocity by converting a first of successive image frames of image data to an intraframe code signal, converting the (n-1) next-following frames to (n-1) interframe code signals, and recording the intraframe and (n-1 ) interframe code signals on the record medium. In one embodiment, n is the maximum number of image frames that can be recorded in the innermost turn of the record medium and n is constant for all turns, whereby the same number (n--1 ) of interframe code signals separate successive intraframe code signals from turn to turn. In another embodiment, n is a variable and increases as the radius of the turn in which the code signals are recorded increases, whereby a larger number (n-1) of interframe code signals separate successive intraframe code signals as the turn radius increases.

Abstract: A noise reduction circuit in a recording medium player is disclosed in which the time-axis of a video signal read out from a memory to be used for noise reduction is changed by a shift command signal for changing the time-axis of a video signal in order to keep the continuity of the phase of a color burst in special playback operation. Owing to the arrangement, even in a special playback operation, the phases of a chrominance signal and a luminance signal contained in a read out video signal, and those of a chrominance signal and a luminance signal contained in a video signal as a signal to be mixing-processed coincide with each other, which makes it possible to prevent the blur in a played back picture.

Abstract: A magnetic recording and reproducing apparatus for recording digital signals of a plurality of channels on tracks on magnetic recording medium and reproducing the same includes an A/D converter for converting analog video signals to digital signals, a signal dividing circuit for dividing the digital signals into first and second digital signals having first and second bit numbers for each channel, a signal permuting circuit for permuting the first and second digital signals of the same channel so as to be recorded on different tracks separately, a magnetic head for recording the permuted first and second digital signals on the different tracks and separately reproducing the same, a signal generating circuit for generating digital signals having a predetermined bit number based on the reproduced first and second digital signals, and a D/A converter for converting generated digital signals into analog signals.

Abstract: In a digital VTR, supplied digital video information is separated into 0th to second stage data by an information separating circuit (300) employing a hierarchical coding method. The 0th stage data are subjected to processes such as error correction as main information capable of roughly forming video signals by themselves. The first and second stage data are subjected to error correction and the like as subinformation forming details of the image. The main information and the subinformation are recorded on a magnetic tape such that the main information is recorded at the central portion of each recording track and the subinformation is recorded on both outer side portions of the recording track. During high speed reproduction, at least the main information is reproduced from the magnetic tape and rough video information is formed based on the reproduced main information.

Abstract: Digital video data recorded in D-1 format, wherein the video data is recorded in successive block units with each block unit being comprised of several segments recorded in plural tracks and with each segment including unit identifying data, is recovered by scanning the tracks with plural sets of reproducing heads to reproduce plural segments concurrently from plural tracks. The unit identifying data in the segments reproduced by all of the reproducing heads in the plural sets are sensed to detect when the unit identifying data in those segments includes common unit identification, thus determining that all of the segments of a preceding block unit have been reproduced from the record medium. That preceding block unit then can be supplied in its entirety to processing or display devices, such as a television monitor.

Abstract: The invention includes an A/D converter, a digital input, decoder for demodulating a signal supplied to a digital input terminal to decode it into respective blocks of data, a digital copy control signal detecting portion for detecting a digital copy control signal from a channel status signal in an output signal of the digital input decoder, a digital copy permissibility decision portion for deciding whether digital copying is permissible or not, according to an output of the digital copy control signal detecting portion, a recording signal selecting portion for selecting one of an output signal of the A/D converter and an output signal of the digital input decoder and supplying the selected signal to a recording signal processing circuit, a first selection switch for selecting one of an output signal of a reproduced signal processing circuit and an output signal of the digital input decoder and supplying the selected signal to a D/A converter, and a second selection switch for selecting one of an output sig

Abstract: The device generates an audio signal from a sound source using a MIDI signal. The music data consists of many pieces of music stored in a memory device like a database in an on-line host computer or an external magneto-optical disc. The music generation processing operations are carried out by 2 microprocessors, each assigned a different set of functions to speed up the overall processing. The receipt and transfer of data to the sound source from the sequencer is carried out in parallel. The data is subsequently output in parallel and the contents of the buffer are monitored constantly to prevent overflow malfunctions. Clock time is divided to enable the generation of trigger signals to control tempo. By variation of the timing of the trigger signals in accordance with tempo data taken from the data stream, the tempo can be varied while reducing the reproduction time processing load.

Abstract: A digital video signal processing apparatus comprising a reproducer, an adder and a signal processor. The reproducer reproduces an analog signal of a still image recorded on a disk-shaped recording medium and converts it into a digital signal. The adder adds at least a predetermined number of digital signals for the same image from the reproducer, and then outputs an added digital video signal. The signal processor accomplishes digital video signal processing of the digital video signal derived from the adder.

Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).

Abstract: A magnetic recording and reproducing apparatus records audio signals digitized by rotary heads (9, 10) on a magnetic tape (12), and reproduces the recorded audio signals. Clock signals and time code data are extracted from externally inputted time code signals by means of a demodulating circuit (72), and phase difference between the frame clock signals and the reference signal is detected by a phase difference detecting circuit (74). A microcomputer (23) assigns the phase difference information and the time code data to sub code packs and stores the same in the memory circuit (40). The stored phase difference information and the time code data are recorded on the magnetic tape. In reproduction, the microcomputer outputs and original time code signals responsive to the reproduced phase difference information and the time code data.

Abstract: A digital signal magnetic recording/reproducing apparatus converts a digital signal into multi-value digital signals and performs recording/reproducing of a multi-value quadrature amplitude-modulated signal. By using the multi-value quadrature amplitude modulation, it is possible to remove the DC component in the recording signal and improve the utilization efficiency of the recording frequency band. Further, using a system to memorize the frequency characteristic of the magnetic recording/reproducing unit and effect Viterbi decoding regarding the intersymbol interference caused by the frequency as a convolutional coding, it is possible to detect the level without necessitating frequency equalization. Accordingly, there arises no deterioration of the S/N ratio by frequency equalization. Furthermore, by providing an encoder for error control coding by increasing the number of multi-values and a corresponding decoder, the error rate can be improved against the deterioration of the S/N ratio.

Abstract: A recording method includes converting an original sound signal into a digital sound signal in a selected conversion range, selecting the conversion range in accordance with the amplitude information of the original sound signal, and storing and recording the digital sound signal. The apparatus includes a first selecting arrangement for selecting a conversion range which corresponds to amplitude information of an original sound signal, a converting arrangement for converting the original sound signal into a digital sound signal in the conversion range selected by the selecting arrangement, and a first memory for storing the digital sound signal converted by the first converting arrangement.

Abstract: A system and technique is disclosed for automatically controlling the decoding and digitizaiton of an analog tape. The system includes the use of a tape data format which includes a plurality of digital codes recorded on the analog tape in a predetermined proximity to a period of recorded analog data. The codes associated with each period of analog data include digital identification codes prior to the analog data, a start of data code coincident with the analog data recording, and an end of data code subsequent to the associated period of recorded analog data. The formatted tape is decoded in a processing and digitization system which includes an analog tape player coupled to a digitizer to transmit analog information from the recorded tape over at least one channel to the digitizer.

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 system for communication between a computer and peripheral devices. The computer is made to generate long duration, synchronous, bi-phase binary coded electrical signals that can be shaped and amplified and then used to modulate a high frequency infrared light beam. Video and audio tape motion counts or electrical signal frequency counts can be read by the computer through the mouse port. Two pulse trains that change relative phase with a change in tape motion direction can be used to record motion counts and determine the direction of motion.

Abstract: A signal processing system for absorbing asynchronism between a video signal and an audio signal which is caused when a PCM audio signal is to be recorded together with the video signal on a helical scan-type tape recorder. When the video signal and the audio signal are recorded on the same track, a recording band width of the audio signal should be narrow. A sample pattern is provided which assures rapid pull-in for both data clock reproduction and carrier reproduction, when the audio signal is modulated by QPSK or when Q-QPSK modulation is used.

Abstract: A method for recording/reproducing digital signals is provided in which each unit of digital data for each channel is constituted by m bit of standard data and n bits of expansion data, the data of each channel are separated into the above standard data and expansion data, the standard data and the expansion data are distributed to different recording tracks and a multiple track recording is performed by stationary heads, so that the data of each channel may be expanded and the m-bit standard data and the n-bit expasion data for each channel may be handled separately from each other.

Abstract: In a system for recording digital data obtained based on an information signal on a magnetic tape and/or reproducing digital data obtained based on an information signal from a magnetic tape, a magnetic recording apparatus comprises an encoder for producing, based on the information signal, one of plural kinds of digital data which have different transmission rates respectively, a time base processor for selectively converting a time base of digital data obtained from the encoder so as to produce modified digital data having a predetermined transmission rate, a recording modulator for producing a recording signal corresponding to the modified digital data, a recording portion provided with a rotary magnetic head device to which the recording signal is supplied and a tape guide for guiding the magnetic tape and operative to cause the rotary magnetic head device to contact with the magnetic tape for forming oblique record tracks on the magnetic tape, a head driver for rotating the rotary magnetic head device at

Abstract: A digital signal recording apparatus is provided with data compressing means for reducing the amount of data of digital information supplied; recording means which is arranged to be capable of selectively recording the digital data supplied or digital data compressed by the data compressing means by means of at least one pair of heads; and switching means for switching a cycle in which recording is performed by the pair of heads from one cycle over to another according to the information to be recorded by the recording means.

Abstract: In a MIDI Signal processor, MIDI data is reproduced from a recording medium. The reproduced MIDI data is outputted. An interruption of the reproducing of the MIDI data is detected. A MIDI status byte is detected after the interruption ends. The outputting of the reproduced MIDI data is suspended when the interruption is detected. The suspending is continued until the MIDI status byte is detected.

Abstract: Two magnetic heads having different azimuth angles are mounted on a cylindrical rotary drum. The data is recorded on the magnetic tape by means of the magnetic heads mounted on the rotary drum. When recording, a frame is composed of one track formed by one magnetic head, and another track formed by the other magnetic head. The data is recorded in the unit of one frame. When reproducing, one track is read by one magnetic head, and the other track is read by the other magnetic head. Plural sets of data to compose one frame are stored in the memory, when reproducing in the normal direction, as the addresses are specified for each set of data. The data stored in the memory is read out from the memory as the addresses are specified so as to be output in a predetermined sequence.

Abstract: A helical drive system (10) reads tracks (18) on a storage medium (12), including tracks which appear as distorted tracks. Each track (18) comprises a plurality of blocks of data, with each block having unique block-identifying information. A track-following servo system (84) causes a read head (16C) to traverse predetermined original azimuthal paths (P0) across the storage medium (12) for reading the blocks recorded along each of the original azimuthal paths (P0). A controller (50) uses the block-identifying information to determine whether any blocks expected to be read during the traversal of the original azimuthal paths (P0) were not read. If expected blocks were not read, the controller (50) repositions the storage medium (12) and directs that the medium (12) be re-read with the head (16C) positionally offset until the expected blocks are actually read. During the re-read attempts, the read head (16C) is positionally offset to traverse sets of modified azimuthal paths (P1, P2, P3, . . . P10 ).

Abstract: Data for reproducing music and displaying words are composed of binary-coded digital signals. Such signals are down-loaded via a public communication line, or data corresponding to a plurality of musical pieces or songs are previously stored in an apparatus, and the stored data are selectively processed by a CPU. In the instrumental music data, trigger signals are existent for progression of processing the words data, whereby the reproduction of music and the display of words are linked to each other. The music thus reproduced is utilized as background music or for enabling the user to sing to the accompaniment thereof while watching the words displayed synchronously with such music reproduction.

Abstract: A method for dividing a message into a plurality of message blocks and storing each of the plurality of message blocks on separate units within a distributed data storage system. Facilities for retrieving the information from the distributed data storage system and recreating the original message for replay are also provided. If a unit within the distributed data storage system fails, then a degredated version of the original message is recreated from the remaining units and their stored message blocks.

Abstract: A still-image information recording/reproducing apparatus records a plurality of still-image information on a recording medium, e.g., a floppy disk, and reproduces such still-image information which has been recorded on the floppy disk. In the normal mode, each of the still images is reproduced. In the index mode, all of the still images recorded on the floppy disk are reproduced as a single still image. In particular, the still-image information recording/reproducing apparatus reproduces each of the still images read from the floppy disk during the index mode, and synthesizes all of the reduced still images with each other, so that a single still image can be produced and output therefrom.

Abstract: A duplicate recording system uses video cassettes for storing master library recordings. On both the recording and the duplicating ends of the system, all signals are buffer stored in an electronic memory while the signals are in a digital form. This buffer storage completely isolates the recording/reproducing steps so that the usual parameter of restraints disappear. For example, the duplication ratio may be any value within the capabilities of the recording/reproducing machines. This isolation eliminates expensive setup procedures heretofore required to switch from one to another duplicating ratio. The buffer storage also provides a more precise transfer with greater fidelity of the recorded signals. A computer calculates a smoother analog curve when the digital-to-analog conversion is made.

Abstract: A clock of a predetermined frequency is generated on a basis of clock information contained in a read signal. Sample values obtained by sampling the read signal in response to the clock are sequentially converted into digital data, and the thus obtained digital data are held in a first data holding means and then second data holding means in response to the clock for a time corresponding to the clock. The digital data and the output data from the second data holding means are added, and the addition output bits are multiplied by a predetermined constant by inserting a selected number of zero bits as upper significant bits, and shifting the addition output bits by the selected number of zero bits. Data corresponding to the difference between the multiplied output and the output of the first data holding means is obtained, and the thus obtained difference output is demodulated in response to the clock.

Abstract: In this invention, pack data of a character mode including a character code is generated by a sub-code processor. The pack data is continuously recorded on a magnetic tape for a plurality of frames by rotary heads. When the pack data of the character mode is played back by the rotary heads, a controller detects the character code included in this pack data and supplies the detected code to a display to display corresponding characters.

Abstract: A method and an apparatus encode and decode binary signals representative of digital information onto or from a high frequency carrier wave. The carrier wave replaces the chrominance signal of a composite video signal. Encoding and decoding of the binary signals are by phase modulation and demodulation of the carrier wave. The method and apparatus allow simultaneous transmission of both the binary signals and the monochrome portion of the composite video signal. The apparatus can be configured to serve as an interface between a mini-computer and a composite video recorder, so that the composite video recorder can be used as a mass storage peripheral.

Abstract: Digital data is formatted and recorded in track pairs on a tape by the rotary heads of a DAT so as to have a header portion for each track which includes a frame number, error correcting code, ID and so on added to the digital data, the content of each header portion of the tracks for any given frame being equal whereby it is possible to easily detect, upon reproduction, unerased data signals due to head clogging and so on by comparing portions of the two header portions of each frame and error correcting the data from those tracks where it is determined that the compared header portions contain different data.

Abstract: A sound reproducing apparatus converts a sound signal reproduced in a 5 multiple speed reverse reproduction mode into a digital signal by pulses obtained by frequency-multiplying reference sampling pulses by 5 to write the digital signal in a memory 12, and reads out the digital signal by the reference sampling pulses to convert the same to an analog signal. Reading of the signal from memory 12 is performed in response to a read address changed in one direction in a predetermined cycle. Writing of a signal to the memory 12 is performed by using address information changed in the direction opposite to that of the read address signal at a speed five times that of a read address signal as a write address in a cycle corresponding to five-sixth of the cycle of the read address signal and only during a period corresponding to one-sixth of the cycle thereof.

Abstract: A rotary head type digital signal reproducing apparatus controls tracking of rotary magnetic heads based on tracking reference signals obtained in an end portion of a first scan and in a beginning portion of a second scan immediately after the first scan, out of successive first through fourth scans made by the rotary magnetic heads with respect to two mutually adjacent tracks on the magnetic tape, when playing the magnetic tape which has been recorded in a half-speed mode. In the half-speed mode, a rotational speed of the rotary magnetic heads and a tape transport speed of the magnetic tape are set to speed which are one-half those in a standard mode. But when playing on the reproducing apparatus the magnetic tape which has been recorded in the half-speed mode, only the tape transport speed is set identical to that in the half-speed mode, and the rotational speed of the rotary magnetic heads is set identical to that in the standard mode.

Abstract: The present invention relates to a digital transmission system provided with a transmitter 11 and a receiver 12, wherein the transmitter 11 comprises a first clock extracting device 13, 14 for detecting a synchronizing signal contained in a first digital audio interface (DAI) format signal from the receiver 12 and generating a first clock signal of a predetermined frequency in being phase-locked with the synchronizing signal, a data read-out device 4 for reading out data from a recording medium on the basis of the first clock signal, and a first encoder 5 for encoding the data from the data read-out device 4 in a second digital audio interface (DAI) format signal on the basis of the first clock signal, while the receiver 12 comprises second clock extracting device 6, 7 for detecting a synchronizing signal contained in the second DAI format signal and generating a second clock signal of a predetermined frequency in being phase-locked with the synchronizing signal, a decoder 8 for decoding data from the second

Abstract: An audio signal recording apparatus comprises a detector for detecting a silent part of an incoming audio signal within the audio signal corresponding to less than a threshold value and generating a detection signal, a circuit for generating a reference signal of a predetermined frequency, a modulator for modulating the incoming audio signal to produce a modulated audio signal, a circuit for superimposing the reference signal on the modulated audio signal in response to the detection signal to produce a recording signal, and a recording circuit for recording the recording signal on a record bearing medium.

Abstract: In a stereo sound digital recording system in which a plurality of tunes or programs are sequentially and digitally recorded on a magnetic tape, the left and right analog input signals are combined and converted to a digital signal. The analog input signals are also applied to a detector which detects the head of the program or tune and which causes to be generated a start identification sub-code signal which is automatically added to the digital signal, before the modulation thereof, and which is recorded on the tape for about nine seconds in the non-sound portion preceding the tune or program. A second sub-code signal, in the form of a program number signal, may also be added to the digital signal, simultaneously with the program start identification sub-code signal, to provide recorded numbers respectively identifying programs which are sequentially recorded on the tape.

Abstract: Signal processing method and apparatus are provided for use in a digital signal reproduction apparatus which reproduces data divided into plural channels and recorded in plural tracks in parallel. Time division operation is applied to digital signals of plural channels read out from plural tracks for every associated reproduction head and at intervals of predetermined unit time interval. In each unit time interval, digital signals of n consecutive units (where n is an integer not less than 2) supplied from associated reproduction heads are multiplexed with a multiplexing factor of n. The above described multiplexed signals of n units supplied from an identical reproduction head are stored into identical addresses of m (where m is an integer not less than 2) memories, respectively. Digital signals supplied from every reproduction head are successively stored into a different address in each memory.

Abstract: A direct current restoration circuit in a digital VTR restores a low frequency component as a cut off in an input digital signal. The direct current restoration circuit has a feedback loop having variable gain. This gain is controlled according to a level of the signal obtained by adding an input signal and a signal as feed back. Therefore, the gain of the feedback loop can be precisely controlled irrespectively of wandering of the base line of the input signal. In addition, the feedback loop is cut off over a predetermined period including the time of switching of a magnetic head, so that waveform distortion at the time of switching can be prevented from being enlarged by the direct current restoration circuit. Additionally, the gain of the feedback loop is changed according to switching of the magnetic head, so that the low frequency component can be suitably compensated for each respective reproducing channel.

Abstract: A digital signal magnetic recording/reproducing apparatus converts a digital signal into a multi-value quadrature amplitude modulated signal, and records and reproduces the multi-value quadrature amplitude modulated signal. By using the multi-value quadrture amplitude modulation, any DC component in the recording signal is removed and utilization efficiency of the recording frequency band can be improved. By bias recording of the multi-value quadrature amplitude modulated signal, non-linearity of the electromagnetic of conversion system is reduced, and deterioration of SN ratio due to distortion is improved.

Abstract: A transmission method for digital data which is adapted to transmit a predictive residual at every sample and a predictive coefficient and a normalization gain at every data block to thereby provide highly efficient coding and data transmission.An adaptive quantization method suitable for use in the above-mentioned digital data transmission, forms samples into a block and a predetermined multiplication is effected on the sample of each of the blocks to thereby improve the accuracy of the predictive coefficients. A stable operation may be ensured in the adaptive quantizing method by cancelling the subsequent operation when the auto-correlation of input data is not recognized.

Abstract: An analog signal digitizer for recording analog signals in a digital form on a video tape of a video cassette player. The digitizer is connectible between an audio production device, such as a compact disc, turntable, or any other audio devices of any quality, and a standard video recorder (VCR). Accordingly, the digitizer acts as an interface device, and converts the analog signals into digital form for recording on the wide band tapes utilized in these standard video recorders. The digitizer has a control circuit at the heart of its system, and it is provided with a memory device to produce control signals in association with audio information digital signals, and arranges these digital signals in a sensitized video-compatible format so that the video cassette treats the output signals of the digitizer as standard television signals.

Abstract: A method for recording and/or reproducing digitally coded video signals. A frame sequence is coded in such a way that an intraframe coded picture having a fixed or variable block length is recorded at the beginning. A fixed number of interframe coded pictures follow. The block length of the interframe coded pictures can be both fixed and variable. A cutting begins with and ends before an intraframe coded picture.

Abstract: A multi-channel digital random access recorder-player receives an analog audio signal, converts the audio signal into a digital signal, and stores the digital signal in a memory for random access. The memory includes sixteen channels, each channel having sixteen memory boards, each channel and each memory board being assigned a unique four bit binary address by an address counter. An external control is provided by which the user selects an address for recording or playback and a comparator compares the selected address with the addresses of the memory. When the memory address corresponding to the selected address is detected, that memory board is enabled so that data can be recorded on the memory board or retrieved from the memory board for playback through an audio output device such as a loudspeaker. The recorder-player thereby provides random access to a memory. Also provided is a system in which several modules, each with a logic board and a memory, are combined into a single system.

Abstract: In an apparatus, such as, an 8-mm VTR, in which a pilot signal and a digital signal modulated by an information signal, and occupying frequency bands that overlap at least in part, are recorded together as an addition signal in a track on a recording medium; a D.C. component of the addition signal reproduced from the track is detected and compared, in a voltage comparator, with the level of the reproduced addition signal so as to provide the digital signal as an output of the comparator, and such output of the voltage comparator is subtracted from the reproduced addition signal so as to provide the pilot signal without error by reason of the digital signal. Further, the pilot signal and cross-talk from adjacent tracks obtained from the first-mentioned subtraction is, in turn, subtracted from the reproduced addition signal for obtaining the digital signal therefrom, and the D.C.

Abstract: An apparatus for recording an reproducing a digital video signal is disclosed which includes n sampling circuits each for performing a sub-Nyquist sampling operation for the digital video signal in such a manner that the amount of data is reduced to one-n-th of an original amount (where n is a positive integer) and a pixel sampled by the sub-Nyquist sampling operation is not sampled by the remaining sampling circuits, recording/reproducing means for recording and reproducing information at all or part of pixels which are sampled by the n sampling circuits and a device for reconstructing the digital video signal from reproduced information at pixels with the aid of a synthesizing technique or interpolation technique.

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 rotary type recording and/or reproducing apparatus is provided with a rotary head which is arranged to record and/or reproduce information signals individually on or from a plurality of parallel areas longitudinally extending on a tape-shaped recorded bearing medium by obliquely transversely tracing the plurality of areas; a first detection circuit which is arranged to at least partially detect signals produced from the rotary head; a second detection circuit which is arranged to detect the rotation phase of the rotary head; and an arrangement for outputting a plurality of binary signals which respectively indicate whether the information signals are recorded or not in at least two of the plurality of areas according to the outputs of the first and second detection circuits.

Abstract: An information signal recording and/or reproducing apparatus, of the kind for recording or reproducing information signals on or from a tape-shaped record bearing medium which has a plurality of areas extending in parallel with each other in the longitudinal direction of the medium, is arranged to record or reproduce a first information signal with a first rotary head which traces the medium in such a way as to traverse each of the plurality of areas while rotating through an angle of .theta. degrees, and to record or reproduce a second information signal with a second rotary head which traces the medium by rotating at a phase differing by of n.theta. degrees, wherein "n" is an integer other than 0, from the rotation phase of the first rotary head.

Abstract: An image signal reproducing apparatus for reproducing image signals from a record bearing medium on which image signals consisting of a plurality of groups of image planes are recorded is arranged to reproduce the image signals recorded on the record bearing medium; to extract, from among the reproduced image signals, representing image signals corresponding to representing image planes; to form position information signals indicative of the recorded positions on the record bearing medium of the representing image signals; and to produce the representing image signal together with the position information signals which respectively correspond to the representing image signals. The arrangement of the apparatus disclosed enables the operator to readily know the contents of the image signals recorded on the record bearing medium.

Abstract: An improved real time digital data transmission speed conversion system is disclosed which employs a method of recording high transmission rate serial format data byte groups of given density on to a recording medium. The method includes the steps of converting each high transmission rate serial format data byte group into a corresponding low transmission rate serial data byte group in real time; and, recording the lower transmission rate serial data byte groups in real time, at a density that is higher than the given density, on a moving recording medium.