Abstract: A magnetic recording and reproducing apparatus records a signal on a recording track of a magnetic recording medium in a recording mode and reproduces the signal from the recording track of the magnetic recording medium in a reproducing mode.

Abstract: A training pattern which is used for a waveform equalization is preliminarily recorded on a disk medium and the waveform equalization to suppress an interference between bits of a read waveform by an adaptive type equalizer is performed. An error detector executes a training operation for adjusting an equalization amount of the adaptive type equalizer so as to minimize an error due to the interference between bits of the read waveform on the basis of the training pattern read out from the disk medium. A bit pattern detector detects a predetermined bit pattern "00" included in the training pattern and instructs the start of the training operation to the error detector by the detection of the first bit pattern "00". A counter counts the number of detection times of the bit pattern "00" by the bit pattern detector and instructs the end of the training operation to the error detector when the number of detection times reaches a predetermined value.

Abstract: An image manipulating system according to the present invention can perform interval recording for repeatedly recording supplied image information at predetermined time intervals. Herein, a limit value of recording time intervals designative depending on an applicable type of information recording medium; such as, a memory card, floppy disk, hard disk, or the like is stored for each type of information recording medium in an EEPROM. A CPU prevents selection of a recording time interval exceeding the limit value, and eventually sets a time interval. Thus, the present invention provides a user-friendly image manipulating system capable of achieving interval recording in as strict compliance as is possible responsive to a demand.

Abstract: A method and device for automatic time setting utilizing broadcasting signal which can set the present time automatically utilizing broadcasting signals of teletext and video program system. The automatic time setting device includes a tuner and demodulation means for synchronizing, receiving and demodulating broadcasting signals, a data slicer for slicing teletext data in package units of the data received from the tuner and demodulation means, a teletext processor for converting the teletext data received from the data slicer into character data, and a first microcomputer for controlling the teletext processor and setting the present time with the character data received from the teletext processor.

Abstract: In a magnetic recording and reproducing apparatus for reproducing a video signal recorded on a video track of a magnetic tape by pair of magnetic heads arranged in a rotation drum so as to oppose to each other at an angle of 180 degrees, while rotating a capstan for moving the magnetic tape in the longitudinal direction, a memory controller controls the reproduced video signal to be written into and be read out from two memories, each of which stores a video signal of at least one field. Then, a quality of image judgment circuit judges a part of the reproduced video signal having a quality of image higher than a predetermined threshold quality level, among a plurality of parts of the reproduced video signal obtained through scan of a pair of magnetic heads.

Abstract: A video tape recording apparatus records and reproduces digital video and audio signals in the form of coded signals that have a recording format which includes a video signal recording area for recording video data and its respective accompanying information, an audio signal recording area for recording video data and its respective accompanying information, insert and track information and subcode information. Preferably, the recording format includes packs having a pack header having a large data item and a small data item to indicate the format and use of the succeeding pack data. Errors in the recorded and reproduced audio and video signals are detected and the value of the respective accompanying information changed to prevent reading of erroneous stored data and thus prevent propagation of errors.

Abstract: A plurality of test signals of different frequencies are recorded on a magnetic recording medium while gradually increasing or decreasing recording current, and the variation of the level of each of the replayed test signals and the variation of the recording current are stored in a memory. From these variations, the amount of detail emphasis and/or the frequency characteristic of a recording equalizer and/or the recording current value for optimum recording of video signals are calculated and stored in another memory, and based on the thus stored optimum data for the magnetic recording medium displayed on display means, a detail emphasis circuit, a recording equalizer frequency correction circuit, and a recording current value setting circuit are controlled singly or in any combination thereof, thereby controlling one or other or any combination of three factors, i.e.

Abstract: An audio signal recording and reproducing apparatus can perform realtime processing with a structure having a low cost. The audio signal recording and reproducing apparatus records a series of input audio signals as digital audio data, and reproduces and outputs the input signals using the recorded digital audio data as output audio signals. An input audio signal processing unit converts the series of input audio signals into digital audio data. A data file recording unit records the digital audio data, as digital audio data file information, on a recording medium, the recording medium having a plurality of clusters in which data having a predetermined number of bytes is recorded, the digital audio file information being recorded over a plurality of clusters. A file management information recording unit records on the recording medium file management information representing the reproducing order of the clusters in which the digital audio data file information is recorded.

Abstract: A magnetic tape recording and/or reproducing apparatus comprises a tape-characteristic-information detecting circuit arranged to detect information on characteristics of a tape from a tape-characteristic-information recording area provided on the tape which is employed as a recording medium, and a circuit-constant setting circuit arranged to set circuit constants of necessary circuits on the basis of the output of the tape-characteristic-information detecting circuit.

Abstract: A magnetic recording device records an input signal on a magnetic medium. Either when the magnetic medium is first inserted in the device, or just before recording of the input signal is to begin, the device determines whether a previously-recorded signal is present on the medium. If no previously-recorded signal is present, a test signal is recorded and reproduced, and the reproduced level of at least one test frequency is measured. Thereafter, during recording of the input signal, the input signal is processed according to the measured level so as to produce a record signal optimally matched to the characteristics of the medium.

Abstract: Digital information recorded in a track (T.sub.a.i) on a tape-like magnetic record carrier (20) can be read out again when the record carrier is transported in a specific direction. The transport direction of the record carrier when the information is recorded may be similar or opposite to the direction in which the information is reproduced. This implies that as a function thereof a first or second equalization filter (F.sub.1, F.sub.2) is to be used during reproduction so as to realise a first or second filtering of the information that is read out. For this purpose, markers (M.sub.1, M.sub.2) are introduced on the record carrier (20) or the cassette (61). From these markers there may be derived whether the side being read out at a specific moment has been recorded in a transport direction similar or opposite to the transport direction during reproduction.

Abstract: A method of synchronizing digitized audio information and digitized picture information establishes a reference time base based on timecodes included with the audio and picture information. The reference time base may be used to synchronize output between a digitized source and one which may be digitized or undigitized.

Abstract: A circuit for detecting the recording/playback mode of a system, e.g., a video tape recorder (VTR), for recording/playing back an image signal on/from a recording medium, using first and second input signals derived from pilot signals also recorded on the recording medium. The circuit includes a first peak value detector for detecting the peak value of the first input signal, and for generating a first output signal representative of the peak value of the first input signal, and a second peak value detector for detecting the peak value of the second input signal, and for generating a second output signal representative of the peak value of the second input signal.

Abstract: A method can record or reproduce a digital audio signal and a digital video signal simultaneously. An N-bit (N: positive integer) digital audio signal is positioned at a higher bit side and an M-bit (M: positive integer) digital video signal is positioned at a lower bit side so as to form an (N+M)-bit digital signal which is recorded or reproduced in this condition. Since the digital video signal is positioned at the lower bit side, the digital video signal may not affect the reproduced audio signal even if the (N+M)-bit digital signal is processed as the digital audio signal in the reproducing process.

Abstract: In a digital signal recording apparatus, when a sampling frequency of a digital signal inputted thereto does not correspond to a predetermined sampling frequency set for the digital signal recording apparatus, the sampling frequency of the input digital signal is converted into a signal of the predetermined sampling frequency by a sampling frequency converter, and then is recorded in a recording medium.

Abstract: A variable speed reproducing apparatus for a digital videocassette recorder which outputs data having an improved C/N ratio. A gate buffer receives a reproduction signal which has been amplified by a pre-amplifier and outputs only that portion of the reproduction signal which has an amplitude greater than a predetermined amount. A reproducer receives the reproduction signal which has been conditioned by a reproduction equalizer and applies the reproduced signal to a synchronizer. The synchronizer outputs reproduced data according to a clock signal produced by a phase-locked loop circuit in accordance with speed data received from a servo.

Abstract: A mode discriminating device which discriminates whether a normal mode or a high-band mode is used to reproduce a recorded video signal. If the reproduction level is too low and/or the noise level is too high, a mute signal is used in determining the discriminating signal so that an erroneous detection thereof is not carried out.

Abstract: An apparatus for recording and reproducing digital/analog video signals including a single head drum attached with heads for processing analog video signals and heads for processing digital video signals, and switches performing switching operations on the basis of the kind of input video signals. The head drum is variable in speed, depending on the kind of input video signals. In accordance with the apparatus, both analog and digital signals can be recorded and reproduced by a single recording unit and a single reproducing unit both capable of varying in characteristic, based on a video signal received thereto. This provides a reduction in manufacture cost and a light, thin, simple and compact construction of the existing VCRs.

Abstract: A data recording and reproducing apparatus of a helical scanning system includes a unit for recording and reproducing an information signal in an oblique information track on a magnetic tape by a rotary magnetic head and a unit for recording and reproducing a control signal on the magnetic tape in a longitudinal direction thereof. Further, the data recording and reproducing apparatus includes a memory unit for storing a difference (X-value error information) between a predetermined X value and a distance (X value) between a record starting position of the information track and a recorded position of the control signal, a unit for recording X-value error information on the magnetic tape individually each time information is recorded, a unit for reproducing X-value error information on the magnetic tape, and a unit for shifting a reproduced phase of the control signal in accordance with the X-value error information.

Abstract: In a digital video tape recording and/or reproducing apparatus including a pair of rotary magnetic heads having a predetermined head width and gaps with mutually different azimuth angles which helically scan a magnetic tape as the tape is advanced in order to reproduce digital video signals that have been previously azimuth-recorded in oblique tracks on the tape, there is a tape transport that can transport the tape either at a standard speed or at a non-standard speed. If the tracks recorded on the video tape have a track width equal to the head width, then the tape is transported for reproduction at the standard speed, whereas, if the track width is different from the head width, the tape is transported at the non-standard speed. For example, if the track width is twice the head width, then the tape is transported at twice the standard speed.

Abstract: A signal demodulating apparatus for demodulating FM video signals on which a pilot signal is mixed. The apparatus comprises an input circuit, a first deriving circuit, a pilot canceling signal generating circuit, a mixing circuit, a limiter and a demodulator. The input circuit admits the pilot signal-mixed frequency-modulated video signals. The first deriving circuit connected to the input circuit derives the pilot signal from the pilot signal-mixed frequency-modulated video signals. The pilot canceling signal generating circuit connected to the first deriving circuit generates a pilot canceling signal based on the derived pilot signal. The mixing circuit connected to the input circuit and the pilot canceling signal generating circuit mixes the pilot signal-mixed frequency-modulated video signals and the pilot canceling signal. The limiter connected to the mixing circuit limits the pilot-canceled frequency-modulated video signals to a predetermined level.

Abstract: A video signal processing apparatus is arranged to process a composite information signal which is formed by multiplexing first and second information signals having different frequency bands. When the composite information signal recorded on a recording medium is reproduced, the first information signal is extracted from the reproduced composite information signal and a first detection signal is obtained by subjecting the extracted first information signal to a detection process. The second information signal is also extracted from the reproduced composite information signal and a second detection signal is obtained by subjecting the extracted second information signal to a detection process. The first and second detection signals are compared with each other. A correction process is performed on the composite information signal reproduced from the recording medium according to the result of comparison. The reproduced composite information signal can be adequately corrected by virtue of the arrangement.

Abstract: A video tape player monitors the selection habits of a viewer selecting from a plurality of video tapes. Each video tape contains a plurality of programs. A first type of video tape has a title information symbol contained in a predetermined interval of the tape, e.g. the vertical blanking interval, for each program on the tape. A clock provides the time of occurrence of commands. A detector receives user inputted commands for controlling the movement of the video tape such as play, record, stop. The user inputted commands comprise a start play command to start moving, in a longitudinal direction, the video tape proximate to a magnetic head so that the magnetic head can detect the programs on the video tape and a stop command to stop moving the tape. A controller is coupled to the detector for commanding the motor in response to the detected user inputted commands and for reading the time of occurrence of the commands.

Abstract: In a magnetic recording system, an asymmetry detector reverses the phase of a read, single-frequency test signal to indicate to a micro-controller whether recording signal asymmetry is present. Upon detecting such asymmetry, the micro-controller causes a current source coupled to the recording head to adjust a write current to correct the timing of a written data signal.

Abstract: A digital signal source and an analog signal source, such as might be contained in a video tape cassette, can be discriminated from each other in a video tape recorder by providing only a minimum of electrical contacts. A first contact is connected to a voltage source and a fourth contact is connected to ground, while second and third contacts are connected through resistors to the voltage source. The second and third contacts are respectively connected through fixed contacts of two change-over switches to a serial data line and to a serial clock line of a data processing circuit, and those contacts are also respectively connected through the other fixed contacts of the change-over switches to comparing input terminals of a group of comparators.

Abstract: A magnetic disk apparatus including a head disk assembly, a servo control circuit, a head positioning microprocessor, a sector pulse generating circuit, a head selection circuit, and a main controller. The head selection circuit selects any one of disk media in a data read/write operation. The servo control circuit controls an operation of a head positioning motor. The head positioning microprocessor controls an operation of the servo control circuit based on an external command. The sector pulse generating circuit has a plurality of sector counters for counting a clock signal and generating sector pulses having different periods, selects one of the sector pulses from the sector counters based on an input selection signal, and outputs the selected sector pulse always with a predetermined separation or longer.

Abstract: A visual search control of digital video files capable of realizing a high quality image even in the fast forward and fast reverse modes, while facilitating a quick mode switching among the normal playback mode and the fast forward and fast reverse modes.

Abstract: An image signal recording apparatus of this invention for recording an image signal on a recording medium, is arranged to divide an image signal corresponding to one picture into k field image signals (k=an integer not less than 3), then multiplex a first index signal indicating that frame reproduction is possible during reproduction with 2n field image signals (n=an integer not less than 1) from among the k field image signals thus formed, while multiplexing a second index signal indicating that no frame reproduction is possible during reproduction with m field image signals (m=a positive integer) from among the k field image signals; and then record the k field image signals, each of which is multiplexed with the first or second index signal, on k tracks of the recording medium, respectively. With this arrangement, it is possible to record on the recording medium an image signal with high image quality compared to conventional arrangements while retaining compatibility with them.

Abstract: A recording current setting method comprises the steps of: recording signals on a tape by changing, by steps, recording current for the tape; detecting a reproduced signal level at each recording current; and determining an optimal recording current from a middle point between a first recording current at which a reproduced signal level first exceeds a threshold level as a result of increasing, by steps, the recording current and a second recording current at which a reproduced signal level first exceeds the threshold level as a result of decreasing, by steps, the recording current. An information signal recording apparatus using the method is also disclosed.

Abstract: A system detects a pattern of holes in a magnetic medium for determining a characteristic of the tape, such as the type of data contained on the tape. A memory device, such as a FLASH memory, is automatically updated when a predetermined pattern is detected. The updating is performed using a read operation without the need for a host system.

Abstract: The precedingly reproduction signal reproduced by a precedingly reproducing head is recorded on a tape. If it is detected that the reproduction signal includes abnormality owing to a reason such as poor error rate, the recording operation is stopped. Then, for retrial of the recording, the information on the position where the abnormality has occurred is held. A memory may be provided to always rewrite and store the signal reproduced by the precedingly reproducing head, and also a simultaneously reproducing head which is different from the precedingly reproducing head may be provided to immediately monitor the recording state of the signal recorded on the tape. If it is detected that the signal reproduced by the simultaneously reproducing head includes abnormality, the recording operation is stopped, the information on the position where the abnormality has occurred is held.

Abstract: A VTR capable of recording information signals, such as a time code, and more particularly providing a configuration for after-recording the information signals for controlling the operation of the VTR, which comprises an operation panel; a mode determination block for determining a mode to be next switched; an information signal processing block for recording and reproducing the information signals; and a recording period setting circuit for determining a recording period of the information signals. A mode signal inputted through the operation panel is recorded on a predetermined position on a magnetic tape. When such a magnetic tape is reproduced, the VTR is forcibly set in a mode determined by the mode signal at the time of detecting the mode signal.

Abstract: The present invention provides a magnetic recording and reproducing unit of a helical scan type having a slow speed tape running mode in which the speed of running a magnetic tape is slower than that of a standard running mode. The magnetic recording and reproducing unit of the present invention has a pair of azimuth heads of mutually different azimuthal angles which are mutually adjacently disposed on the outer periphery of a rotating cylinder and another pair of azimuth heads of mutually different azimuthal angles which are mutually adjacently disposed at positions symmetrical with the first pair of azimuth heads with respect to a rotating center of the rotating cylinder. Each pair of the two pairs of azimuth heads alternately traces tracks recorded with image signals on a magnetic tape to reproduce the recorded image signals.

Abstract: Methods of and information recording devices for recording and/or inhibiting recording of a signal including copy bits on a record carrier, and a record carrier including that signal. The signal has successive information frames including main data and subcode data. The subcode data of the information frames make up successive subcode frames having copy bits with logic values which alternate among the subcode frames in accordance with a predetermined pattern. Each subcode frame has at least one copy bit. In one of the embodiments, the signal is received and a determination is made whether to inhibit its recording on the basis of the predetermined pattern exhibited by the logic values of the copy bits contained in the subcode frames. In another embodiment the subcode frames are replaced by substitute subcode frames having copy bits with logic values which alternate among the substitute subcode frames in accordance with a selected pattern prior to recording of the signal.

Abstract: An information signal recording and reproducing apparatus having a reproducing head at a position anterior to a recording head by a distance corresponding to a predetermined time interval for recording an information signal on a recording medium and reproducing the recorded information signal. A test pattern signal is generated and delayed in a delay circuit by an amount determined by a control signal. An external delay-factor device receives the delayed test pattern signal and imposes a further delay thereon. The phase of the delayed signal from the external delay-factor device and the phase of the test pattern signal are compared and the control signal is generated, such that the sum of the amounts of delay imposed by the external device and the delay circuit becomes coincident with the predetermined time interval. Thus, the desired phase adjustment can be automatically and rapidly achieved with precision.

Abstract: A tape drive subsystem discloses that variable length symbols can be used to reliably identify data stored on the tape. Machine controlling procedures are disclosed to encode and decode data for the reliable sensing of the serial number of a media, especially tape cartridges, having different track densities. The subsystem detects the serial number of the media and corrects, or at least detects, error patterns. A variable length symbol code is encoded in a plurality of groups with each group having a "one" being represented as an erase gap ERG signal covering a first two units of a group, and a "zero" is represented as one unit of an ERG signal, both followed by four units of an Inter Block Gap IBG signal.

Abstract: In a magnetic recording and reproducing apparatus such as DAT, when recording an acoustic signal which is a series of recording information on a magnetic tape, a program start signal is recorded automatically at the start of recording. This program start signal indicates a program recording start position on an acoustic signal or the like. This program start signal can be additionally recorded in a magnetic tape in which a program has been already recorded. When the program start signal record button is pressed while reproducing the magnetic tape, plural recording areas including the recording area which has been reproduced at the time of pressing are reproduced repeatedly. A recording area to be recorded additionally may be arbitrarily specified in such plural recording areas being reproduced repeatedly. The front-rear relation of the specified recording area may be confirmed by lighting an indicator or by the change of reproduction level during repetitive reproduction action.

Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a

Abstract: A method of controlling the gain of a read amplifier preparatory to writing data on a length of multitrack magnetic tape, by writing and reading in a read-while-write mode a reference pattern on the tape immediately when the tape starts running. The gain of the read amplifier is automatically controlled so that the output therefrom, representative of the reference pattern read on the tape, may have a magnitude within a predetermined range. The gain control procedure is retried up to a predetermined number of, say, fifteen if the output magnitude of the read amplifier fails to come up to the predetermined range. If the failure in gain control is due to dust accumulation on the tape or on the transducer, the reference pattern is increasingly more likely to be written and read properly during the retries because the dust may be removed by relative sliding motion between the tape and the transducer.

Abstract: An apparatus for producing and recording a video signal, which comprises a signal supplying device for picking up images in a picture area having a first or second aspect ratio to supply a first pickup output signal representing images in the picture area with the first aspect ratio or a second pickup output signal representing images in the picture area with the second aspect ratio. The pickup output signal is supplied to a signal processing circuit having a first condition for processing the first pickup output signal to produce a first video signal therefrom or a second condition for processing the second pickup output signal to produce a second video signal; whereafter the first or second video signal produced by the signal processing circuit is recorded on a recording medium.

Abstract: A retrieval device and method for retrieving audio signals recorded on a floppy disk, in which the audio signals are reproduced by an amount needed to recognize the content of the audio signals to obtain a heading of the audio signals. A track of the floppy disk is divided into sectors. The audio signals are recorded in various sectors, and the head of the audio signals are recorded in one of the sectors. The audio signals are reproduced from the head, and can be reproduced within a predetermined time, regardless of a compression ratio compression ratio that is used, and the audio signals may be that is used with the audio signals. The amount of the reproduced audio signals may be changed in accordance with the reproduced at a high speed.

Abstract: A video data recording/reproducing apparatus is designed to effect the high density recording for low bit rate coded data, correct the error with high reliability and reproduce only the main signal. For this purpose, an error correction circuit corrects the error in a transmission path by use of a parity code added by a parity adding circuit on the transmission side. A switch selects one of outputs of the parity adding circuit and error correction circuit according to whether the parity code is contained in the transmission data or not. A recording/reproducing circuit causes an output of the switch to be recorded. At the time of reproducing operation, the error correction circuit corrects the error in the recording/reproducing operation by use of the parity code contained in the reproduced signal.

Abstract: A video tape recorder in which video and audio signals of a plurality of channels are simultaneously recorded onto the same tape by using the same tape running mechanism and the signals of a plurality of channels may be simultaneously reproduced from the tape. The video tape recorder of the invention comprises a recording system and a playback system. The recording system includes a recording processing unit for converting the plurality of video signals into recordable signals, respectively; first and second rotary head pairs which are oppositely arranged with respect to a cylinder. Each head has a track width narrower than a recording track pitch and have gap azimuth angles in an opposite relation. Each head records the signals onto the tape and reads out the signals from the tape. The recording system further includes a unit for recording a control signal synchronous with a vertical sync signal included in one video signal onto a control track.

Abstract: Methods and apparatus are provided for recording and reproducing digital information signals including image and audio portions in successive tracks on a magnetic tape. An ID signal is produced for one of an image portion and an audio portion of a corresponding digital information signal to be recorded. The ID signal indicates whether the portion is to be after-recorded in a respective track. The ID signal is combined with the portion to form a recording signal. Previously recorded digital information signals are reproduced from the track and an ID signal thereof is obtained. The recording of the portion in the track is controlled based on the reproduced ID signal.

Abstract: A system for preventing the unauthorized copying of audio or video recording by (1) processing the recorded material so as to identify the protected material in a manner that does not audibly distort the program material, and (2) processing the recorded material by a second method that produces audible artifacts. Equipment capable of removing the audible artifacts while retaining the inaudible identification signal would be installed in audio digital tape recorders or video recorders so as to allow the equipment to be used for playback purposes while at the same time discouraging the unauthorized copying of audio, video or motion picture protected material.

Abstract: In a data recording method, successive frames of main data and auxiliary data are recorded on a recording tape. The auxiliary data includes control information regarding the main data. A main data completion point indication is recorded in a track of the auxiliary data prior to a corresponding location of a track of the main data at which recording of the main data is completed. Also, a continuous data flag is recorded at a location in the auxiliary data track corresponding to the location of the main data track at which recording of the main data is completed. The continuous data flag indicates that the recorded main data continues at a corresponding location and an opposite plane of the recording tape. When a recorded data region end search is carried out, the tape running direction is reversed upon detection of the continuous data flag in the auxiliary data track.

Abstract: A camcorder which can record and reproduce an image signal, and more particularly relating to a camcorder character editing circuit which can change control pulses recorded on a control track of a tape, thereby recording character information, so that the control pulses can be read out during the reproducing process to thereafter display the character information on an existing image signal. A control circuit outputs character information data and a predetermined control signal to a control head, to thereby be recorded on a control track, and during a reproduction process, outputs character information, detected by a data detecting circuit, to an on-screen-display integrated circuit to thereby display the character on a screen and to thereafter obtain a control signal from the control signal data.

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: Herein disclosed is a method and a system for recording and reproducing digital audio signals which enable simultaneous recording of video signals and audio signals without a synchronous relation, and simultaneous reproducing rerecorded audio signals if a part of channels of the audio signals are rerecorded, since a sample number of the audio signals for each the channel is equal to each other. On rerecording, a modulator 113 demodulates signals and the demodulated signals are separated into audio signals and sample number discriminating signals of the audio signals by a demultiplexor 114. A second counter changes dividing number on the basis of the sample number discriminating signals separated by the demultiplexor 114. A phase comparator 118 compares a phase of a cycle of the second counter 117 and a phase of a video frame cycle. Output signals are limited their band by a low-pass filter 119 and controls an oscillated frequency of a voltage controlled oscillator (VCO) 120.

Abstract: Information bearing signals are recorded in one of a plurality of record formats on one record medium, such as a magnetic tape, magnetic disk, optical disk, and the like. The format selected may be commanded or based upon record lengths, in bytes. When the record length equals or exceeds a predetermined number of bytes, then one record is recorded in each signal block of the record format. When the record length is less than the predetermined number, then a second format is used which inserts several of the records in one of the signal blocks. The signal block and its packets respectively contain indications of formats such that any one of several formats may be used on one record medium and in one signal block having a plurality of variable length packets. Logical indicators, such as format marks, tape marks, and the like, may separate formats used on the storage medium.