Abstract: An apparatus for recording an information signal that includes a signal processor for processing an information signal to be magnetically recorded, n magnetic heads (n is an integer of 2 or more) provided on a rotating drum with a step of about 1/n the width of a magnetic tape and a distributing circuit for selectively supplying the processed information signal to one or more than two of the n magnetic heads, wherein the processed information signal is recorded on one or more than two track areas of the magnetic tape by the magnetic head. Thus, much data can be recorded at a high transmission rate to improve the quality of picture, and also, a high access speed can be achieved.

Abstract: The specification discloses a recording and reproducing apparatus for dividing a video signal of one field into a plurality of segments and recording the video signal onto a plurality of tracks on a recording mediuim. By the recording and reproducing apparatus, an additional period is inserted between the adjoining segments. Further, the signal included in one of the adjoining segments is used as a signal of the additional period.

Abstract: A multiplex recording/reproducing system with at least four video signal recording/reproducing magnetic heads mounted on a rotating body with a predetermined interval in the direction of rotation of the rotating body. At least four audio signal recording/reproducing magnetic heads are mounted on the rotating body, alternately with the video signal recording/reproducing magnetic heads. The magnetic tape is forwarded while being wrapped on the rotating body over a region extending at least a multiple of the predetermined interval. Recording/reproducing circuits record and reproduce the video signal and the audio signal while switching over the video signal and the audio signal recording/reproducing magnetic heads in a predetermined order for every predetermined period.

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 magnetic tape is wound on a rotary drum through a predetermined angular range greater than a standard tape winding angle. The predetermined angular range has a first portion corresponding to the standard tape winding angle and a second portion extending outward of the first portion. A main information signal is recorded into a main information recording track on the magnetic tape which extends in a region corresponding to the first portion of the predetermined angular range. A sub information signal is recorded into a sub information recording track on the magnetic tape which extends along an extension line of the main information recording track and which extnds in a region corresponding to the second portion of the predetermined angular range. A plurality of magnetic heads have different track widths respectively and are mounted on the rotary drum. The magnetic heads form respective different tracks which together constitute the sub information recording track.

Abstract: A differential amplifier (15, 16) which drives a recording head and is located on the headwheel which carries the recording head is equipped with automatic switchover provided by a transistor (18) in series with a resistance and the emitters of the differential amplifier. In the absence of signals in the rotor of the rotary transformer which supplies signals to be amplified for recording, this differential amplifier has substantially no idling current, but in response to the presence of a signal in the rotor, a switchover signal is provided making the transistor (18) in the emitter circuit of the differential amplifier conductive and putting the differential amplifier into class A operation. As a result, digital video signals can be recorded at a high data rate without distortion, whereas unintended erasure of the magnetic tape by direct current components in the winding of the recording head is prevented.

Abstract: The device includes a synchronizing-signal separator (20), a phase-locked loop (23), having a phase comparator (25), a voltage-controlled oscillator (28) and a frequency divider (31). The device further includes a gate circuit (26) having an input (S) coupled to the output of the synchronizing-signal separator (20), and an input (5) for receiving a head-change signal (a). The output (36) of the gate circuit (26) is coupled to a control-signal input (37) of the frequency divider (31). The gate circuit (26) is adapted to generate the control signal at a first instant (t.sub.1) of a head change and to sustain this control signal until a second instant (t.sub.2) of detection of the n-th (preferably the first) synchronizing signal after the head change. The frequency divider (31), which includes a counter (40), is adapted to inhibit the output signal (d) in response to the control signal, to set the count to a specific value, and to enable the counter at the second instant in order to realize frequency-division.

Abstract: A rotary scanning device of a magnetic tape recording and playback equipment, which carries a set of recording heads and a set of playback heads on its periphery is provided with one rotary transformer in addition to the number equal to the number of recording heads and to the number of playback heads of said sets. The additional rotary transformer is used for cyclically connecting its rotor to the respective playback heads during a recording operation by means of a controlled transfer switch, so that a fraction of the signals recorded by each of the recording heads is made available for an after-check which can be performed without visual display because of the digital nature of the recorded signals, which are evaluated by error recognition and word count circuits.

Abstract: A magnetic recording and playback apparatus comprises a rotary drum (5) having a center of rotation inclined to the running direction of a magnetic recording tape (7), a group of first and second channel recording heads (1,3) and a group of first and second channel playback heads (2,4) mounted on an outer periphery of the rotary drum (5) at an angular interval of substantially 90 degrees, the positions of the recording and playback heads alternating along the outer periphery. The axial distance between the recording head group and the playback head group is set to a value of approximately 7/4 times the track pitch Tp of consequently formed tracks. The first and second channel recording heads alternately form first and second tracks in sequence on the magnetic recording tape, and after the second track is formed by the second recording head, a recorded signal on the first track is outputted by being traced with the first channel playback head.

Abstract: The present invention discloses a rotary head type magnetic recording and reproducing device in which a rotary drum is provided with a pair of magnetic heads arranged at an angle of 180.degree. and a further pair of magnetic heads deviated in phase angle from the first mentioned magnetic heads and arranged at an angle of 180.degree. from each other, and a widening angle of a tape in contact with the drum is smaller than the phase angle, one pair of magnetic heads being exclusive for recording while the other pair of magnetic heads being exclusive for reproducing. A gap length of the magnetic head exclusive for reproducing is longer than that of the magnetic head for recording.

Abstract: A rotary head type magnetic recording/reproducing apparatus having two playback heads A' and B' for verifying the recorded condition after recording on a magnetic tape by two recording/reproducing heads A and B (read-after-write) by which any recording error is found immediately. Two playback heads A' and B' are mounted, respectively, at positions separated by 90.degree. around a rotational center axis relative to the recording/reproducing heads A and B along the head rotating direction. Heads A' and B' are mounted also deviating by a particular dimension relative to the recording/reproducing heads A and B, along a direction perpendicular to the head scanning direction. Since read-after-write is performed immediately after recording, any recording error is found almost simultaneously with recording, by performing read-after-write as in normal reading.

Abstract: An amplifying device for applying a DC bias current and a signal current to a load circuit includes a current supplying element for supplying a current to the load circuit, a control signal applying circuit for applying to the current supplying element a DC bias control signal defining the DC bias current supplied from the currenting supply element, and a signal applying circuit for applying to the current supplying element an electrical signal defining the signal current, wherein the rising and falling of the DC bias control signal are provided with given time constants.

Abstract: A rotary head type reproducing apparatus having a reproducing rotary head for reproducing signals recorded on a recording medium and a rotary erasing head for erasing signals recorded on the recording medium, both heads being mounted on a rotary member, wherein a reproduction amplifier for amplifying a reproduced signal reproduced by the rotary reproducing head is put on the rotary member and supply of electrical power to the reproduction amplifier is made through a rotary transmitter which, when erasing, transmits an erasing signal to the erasing head therethrough.

Abstract: N-channel component signals (N.gtoreq.3) of a video signal is recorded and reproduced by N pairs of magnetic heads in any tape speed mode. The N pairs of heads are mounted on a circumference of a rotary cylinder so as to be disposed in the rotating direction of the rotary cylinder at substantially constant intervals of (180/N) degrees with each pair of heads being disposed to be apart by substantially 180 degrees from each other. The relative heights of the heads in each pair in an axial direction of the rotary cylinder are substantially the same. The widths of the N pairs of heads are substantially the same. Signal timings are adjusted by delay circuits before recording and after reproduction.

Abstract: An electro-optical signal transmission module for transmitting an information signal between stationary and moving objects (such as the stationary and moving components of a rotary magnetic head scanner). The module has complementary mating structure to facilitate the stacking of a plurality of modules together, so that a plurality of separate information signals may be transmitted between relatively moving bodies.

Abstract: A magnetic recording apparatus of the rotary head type has a cross-talk cancelling function. A plurality of rotary magnetic heads are used to record signals on a magnetic recording medium and a correction signal is formed by using a record signal which is being fed to any one rotary magnetic heads among the rotary magnetic heads to which the record signal is fed during a period, when the record signal is being fed through different rotary transformers, to at least two rotary magnetic heads among the plurality of rotary magnetic heads, and the correction signal thus formed is used to correct the record signal fed to the other rotary magnetic head. As a result, the cross-talk component which may be produced in the record signal between the rotary transformers located at different positions can be effectively removed.

Abstract: A method and system of recording on a video signal recorder a serialized stream of pulse code modulated digital data bits. The video signal recorder has multiple record/playback heads and is of the type normally adapted to record video signals such as television signals under the control of synchronizing signals included in the video signals. Data frames having a predetermined number of data bits of the serialized stream of pulse code modulated digital data bits are successively applied at a given frequency to a data buffer. The frequency of the data bits of the data frames output from the data buffer is increased thereby compressing in time the data frames. Buffer zones of filler bits provide a predetermined period of time between successive data frames. Synchronizing signals are inserted in the buffer zones for controlling the timing of switching events between recording heads to occur within the predetermined period of time.

Abstract: A skip-field guard-bandless video tape recorder records and plays back adjacent tracks on a video tape with two closely adjacent heads of opposing head gap azimuth angles (to suppress cross-talk), only during alternate (odd) half-rotations of the head drum. Unavoidable cross-talk of synchronization pulses from adjacent tracks does not create visible interference or timing errors during playback by virtue of a special offset angle .theta..sub.1, between the adjacent recording heads, proportional to the linear offset distance between adjacent tracks. During playback, skipped fields are "filled-in" by a repetition of each recorded field through a second (duplicate) pair of closely adjacent heads of opposing azimuth positioned to retrace the recorded tracks during the other alternate (even) half-rotations of the head drum. An offset angle .theta..sub.2 between the two head pairs (i.e.

Abstract: A device for transferring signals between itself and a record carrier tape, the device including a rotating head wheel disk, at least one head disposed on the rotating head wheel disk, a sensor and a signal emitter to indicate the position of the head wheel disk, the improvement wherein the signal emitter comprises two juxtaposed electrical conductors.

Abstract: Magnetic recording and reproducing apparatus including a rotary head drum and power system. The rotary head drum includes at least a rotary head and preamplifier mounted therein. A rotary transformer communicates information signals to/from the rotary head drum and also transmits high-frequency powers signals for operating the pre-amplifer. The transmission occurs at time periods during which recording and reproducing action cannot be performed.

Abstract: The present invention relates to a magnetic recording and reproducing device wherein reproduction monitoring can be made directly after recording, and more particularly to a construction of a rotary drum for the same. The magnetic recording and reproducing device includes a single recording channel for n recording magnetic heads, and n reproducing channels for n reproducing magnetic heads. The recording channel is provided either on an innermost circumference side or on an outermost circumference side of a rotary transformer. Since the device has such a reduced number of recording channels, the distance between adjacent channels can be increased and the transmission loss of a reproduction signal can be reduced.

Abstract: An angular position indicating signal generator for a data reproduction machine having a rotary element for recording and reproducing data including a reference signal having a predetermined delay time. The angular position indicating signal generator includes an angular position detection circuit for detecting the angular position of the rotary element relative to the rotary plane of the rotary element, a counter circuit for detecting the time difference between the rotary element and the reference signal, a memory circuit for storing the count of the counter circuit, and a delay circuit for automatically compensating the detected output of the angular position detection circuit in response to the count stored in the memory circuit.

Abstract: When the relative speed of the head wheel to the tape transport is reduced for recording at a lower data rate, a resistance interposed between the stationary driver amplifier and the stator of a rotary transformer is reduced to produce a mismatch of the coupling between the driver amplifier and a recording amplifier on the head wheel. The latter is connected to the recording head. The mismatch lowers the upper cut-off frequency of transmission through the rotary transformer and shifts the frequency transmission band downward also lowering the lower cut-off frequency.

Abstract: The invention concerns a videorecorder with a rotating head drum (KT) that has video heads (K1 & K2) with a magnetic tape (B) looped partly around them mounted on it, with at least one pulse generator (M) mounted on the head drum, with at least one sensor (S) that generates a head-shift signal that switches from one video head to the other, and with a control head (KK) for scanning the vertical-synchronization signal during playback. In the playback mode the time between the signal supplied to the sensor and the vertical-synchronization signal is measured and compared with a reference, and a criterion for controlling the position in time of the head-shift signal is derived from the comparison.

Abstract: A digital magnetic recording and reproducing device of rotatable magnetic head type includes a rotary drum, first and second recording and reproducing heads situated at opposite positions on the circumference of the rotary drum with opposite azimuth angles, and a third recording and reproducing head adjacent to the second recording and reproducing head, with an azimuth angle opposite to the azimuth angle of the adjacent second head. In the normal reproduction mode, the first and second heads are used, but in the long time reproduction mode, the second and third heads are used. However, the rotational speed of the rotary drum is the same in each mode, allowing for the use of one equalizer for reproducing the signal for both the normal reproduction mode and long time reproduction mode.

Abstract: A rotary head type digital signal recording and/or reproducing apparatus wherein for 1/2 speed recording and/or reproducing from a magnetic tape, a tape feed speed is decreased to 1/2 times the normal speed, and a recording/reproducing interval becomes 2 times that of the normal mode of operation utilizing at least two rotary heads mounted at adjacent positions on a rotating cylinder with one of the rotary heads having a plus azimuth angle and the other having a minus azimuth angle. For 2 times speed recording/reproducing, a tape feed speed increases to 2 times the normal speed, and a recording/reproducing interval becomes 1/2 that of the normal mode of operation utilizing at least two rotary heads mounted on a rotating cylinder at opposite positions of a rotary axis of the cylinder, with one of the two rotary heads having a plus azimuth angle and the other having a minus azimuth angle.

Abstract: A magnetic recording apparatus includes a rotary drum around which a magnetic tape extends in an angular range substantially equal to 270.degree.. Four pairs of magnetic rotary heads are mounted on the rotary drum. The rotary heads in each of the pairs have a common azimuth angle. Two of the pairs of the rotary heads are angularly spaced substantially at right angles and have track widths greater than a track pitch in a long-play mode and constitute video heads used in both of the long-play mode and a normal-play mode. Other two of the pairs of the rotary heads are angularly spaced substantially at right angles and constitute audio heads. The video heads alternate with the audio heads in a direction of rotation of the rotary drum.

Abstract: A signal recording apparatus comprising the operation portion to be manipulated when it is found necessary to record a signal on a recording medium while the signal is being produced, a signal conversion circuit for converting the signal to a digital signal, a memory circuit of specified capacity for temporarily storing the digital signal from the conversion circuit and thereafter feeding the signal to a signal recording head, and a main control circuit for controlling the memory circuit for storing the signal therein and reading out the signal therefrom. In response to a recording start instruction given by the operation portion, a system for driving the recording medium is initiated into operation, and at the same time, the signal is read out from the memory circuit retroactively since a predetermined time interval prior to the manipulation of the operation portion and is recorded on the medium.

Abstract: A multi-channel recording apparatus in which n rotary heads (n is 3 or higher integer) are arranged on the outer peripheral edge of a drum in evenly spaced relation, and a tape-shaped recording medium is trained round the drum over an angular range of at least 360.degree..times.(1-1/n), while recording (n-1) channels of a signal on the recording medium by using the (n-1) of the n heads which are simultaneously tracing on the medium.

Abstract: A video tape duplicator for duplicating a video signal simultaneously on a plurality of video tapes at high speed. The duplicator includes a source for providing a high frequency video signal and a record head for simultaneously recording the high frequency video signal on a plurality of duplicate magnetic tapes. The record head rotates at a speed which is related to the frequency of the high frequency signal so that the duplicate tape may be played back at normal head and tape speeds.

Abstract: A video signal recording and playback apparatus for recording each field of a video signal as a plurality of segments on a plurality of tracks, including a circuit for inserting segment index signals after conversion of the video signal to a recording signal, to be recorded together with the recording signal to designate the respective segments. During varied-speed playback operation, the segment index signals are detected in the playback signal, and the data thus obtained are used to control the operation of a memory which temporarily stores successively produced portions of the playback signal. A playback signal can thereby be obtained by combining output signals from the memory, which will produce a satisfactory display image during varied-speed playback operation, e.g. during high-speed playback, with only simple signal processing being required.

Abstract: A slant record/helical scan playback certifier for high speed magnetic tape certification including a signal generator for producing test data, a slant record head for recording the test data onto magnetic tape, a plurality of helical scan playback head for reproducing and transmitting the test data recorded in the magnetic tape, an error detector and error counter for detecting and counting the test data errors found on the magnetic tape and an error collection reporting system for collecting and reporting the test data errors found in the magnetic tape. Further disclosed are a preamplifier and an amplifier for amplification of the test data transmitted by the helical scan playback head.

Abstract: A rotary head type recording apparatus according to the present invention can record information signals on a tape-shaped magnetic recording medium based on a plurality of kinds of recording modes in which track pitches are different from each other, and the track pitches of the recording tracks formed on the taped-shaped magnetic recording medium are varied depending on the kinds of the recording modes and at the same time a pattern of a signal-for-erasion supplied to a rotary type erasing head with wider width in the direction perpendicularly crossing a tracing direction of the head than that of a rotary type magnetic head is varied depending on the kinds of the recording modes, so that the undesirable influence of the signal-for-erasion over the recording of the information signals is reduced and at the same time power consumption is also reduced.

Abstract: A rotary head type reproducing apparatus having pairs of rotary heads each of the pairs consisting of two heads which have different azimuth angles and are arranged close to each other to reproduce signals from a record bearing medium on which many tracks are formed in parallel with the azimuth angles of adjacent tracks differentiated from each other is arranged to selectively produce the outputs of the pair of rotary heads according to a tracking control signal obtained from the signals reproduced by the pair of rotary heads.

Abstract: In an apparatus for reproducing a digital signal wherein a signal is read by a plurality of reproducing rotary heads which trace a track with an interval narrower than the interval of tracks formed on a tape, a wrap angle with which a tape is wrapped around the periphery of a rotary drum to which the rotary heads are attached is selected to be less than 360.degree./n with respect to the number n (n is an integer) of rotary heads, the rotary heads are rotated at a speed twice the normal rotational speed of the heads, the demodulated digital signal is stored in a memory corresponding to a frame address and a block address detected from the reproduced digital signal, and then the digital signal stored in the memory is read out therefrom in a predetermined order, whereby an apparatus for correcting the tracking of the tape by the rotary heads can be eliminated.

Abstract: A rotary head apparatus includes magnetic heads on its outer peripheral portion and rotatably supported in a hollow space defined by fixed hollow upper and lower cylindrical drums, a brushless motor stator coil attached to one or the other of the fixed drums, and a brushless motor magnet and yoke, or a first and a second magnets, arranged on the rotary head apparatus on both sides of the stator coil with a gap therebetween.

Abstract: In order to reduce disturbances in a device for demodulating a frequency-modulated signal, which disturbances are caused by head-switching in a video recorder, a low-pass filter which is normally arranged between the demodulator (10) and the hold circuit (12) is relocated. The low-pass filter (23, 24), i.e. at least the capacitive element (24) of this filter, is arranged in the hold circuit (12), and, in particular, at least the capacitive element (24) of the low-pass filter (23, 24) being arranged in the main signal path after the switching means (18).

Abstract: In a magnetic tape recording system having a single master tape player and a plurality of slave recording devices each including at least one rotary magnetic head for repeatedly scanning a respective magnetic recording tape, and each receiving, from the single master tape player, a signal to be recorded along with an external sync or reference signal; each of the slave recording devices is provided with a respective time base adjusting memory in which the signal to be recorded is written in synchronism .with the external reference signal, and from which the signal to be recorded is read-out in synchronism with a reference pulse generated in timed relation to a predetermined rotational position of the respective rotary magnetic head.

Abstract: In a clock signal regenerator of reproducing apparatus for reproducing a PCM converted signal recorded on magnetic recording medium through helical scan of a slant azimuth method, an output voltage from a loop filter in a PLL circuit which derives clock signals based on the PCM reproduced signals is switched in response to switching between magnetic heads having a different azimuth angle.

Abstract: A reproducing apparatus for reproducing blocks from a recording medium on which a plurality of signal blocks are recorded on plural recording tracks, uses a rotary head which is rotated at a speed equal to at least twice the normal speed. Error detection of a reproduced signal is performed for each signal block, and a detection signal and a reproduced signal of the corresponding signal block are written into a memory. If the detection signal indicates that no error is detected, the reproduced signal from the corresponding signal block is prevented from being written again into the memory. A reproduced track address signal and a reference track address signal are compared, and in accordance with the comparison result, translation of the recording medium is controlled.

Abstract: An analog signal synthesizing processing circuit with a periodic noise compensation generates analog signal of a plurality of audio signals and so forth containing noise generated almost periodically, for example by head switching of VTR, and plurality of analog signals containing the noise are phase-synchronized with given sampling clock signal and phase synchronizing circuit by timing oscillating circuit, the phase-synchronized signal is output from reproductive audio signal processing circuit, converted into digital signal by analog-digital converter and the noise contained in this converted signal is approximated from its preceding and following signal by compensation processing circuit and this approximated signal is converted into analog signal by digital-analog converter.

Abstract: A drum assembly for carrying a plurality of rotary recording and reproducing heads of a magnetic recording and reproducing apparatus recording and reproducing a signal on and from a magnetic recording medium in a rotative manner.

Abstract: A rotary head type reproducing apparatus having a plurality of rotary transmitters which respectively receive signals reproduced from a record bearing medium by a plurality of rotary heads is arranged to eliminate any cross-talk between the rotary transmitters by adjusting the levels of signals produced from these transmitters relative to each other and then by performing a computing operation on the adjusted signal levels.

Abstract: A magnetic recording/reproducing apparatus for magnetically recording and reproducing information on and from a magnetic tape. The apparatus includes a rotary drum adapted to be rotatable about its own axis and having at its circumferential portions a plurality of magnetic heads including at least first and second signal recording/recproducing magnetic heads and one signal erasing magnetic head. In order for coupling between the plurality of magnetic heads and a recording/reproducing circuit of this apparatus, further included is a rotary transformer which is provided between the rotary drum and a stationary portion of this apparatus and which includes first and second transformer coil assemblies coupled to the first and second magnetic heads, respectively, and one erasing coil assembly coupled to the erasing magnetic head. The erasing coil assembly is disposed between the first and second transformer coil assemblies to assume a magnetically neutral position with respect thereto.

Abstract: In recording/reproducing apparatus, pilot signals of different frequencies are recorded cyclically and in a predetermined sequence on parallel record tracks on a moving record medium together with an information signal organized in a series of fields and are employed to control tracking of a reproducing head of the apparatus during reproduction. During reproduction, the record medium is transported at a predetermined speed and phase relative to the reproducing head in order to generate reproduced pilot signals and a reproduced information signal. The reproduced pilot signals are multiplied by reference pilot signals switched in accordance with a head switching signal, thereby generating an output from which a tracking error signal is derived. The tracking error signal is sampled and held at predetermined points of a plurality of fields. A comparator effects a comparison of the sampled-and-held signal with a reference signal and produces a comparator output signal having a state that depends on the comparison.

Abstract: To effectively eliminate cross-talk between the weak signals picked up by a tape transducer pick-up head with signals being applied to a recording head, a disk-like headwheel carrier has a disk-like headwheel secured thereto. The disk-like headwheel carrier is formed with a recess which defines a chamber (6) in which the preamplifier for the reproduced signals is placed. Transducer leads are passsed in a channel duct formed between the headwheel carrier and the disk-like headwheel, which is in plate form. Preferably, both the disk-like headwheel as well as the carrier are made of lightweight metal, such as aluminum, so that the reproducing amplifier is totally shielded. The recording amplifier can be placed on top of the disk-like headwheel, separated and shielded from the reproducing preamplifier.

Abstract: A recording and/or reproducing apparatus employs a azimuth-pair-head in a rotary head drum. The rotary head drum is axially shifted by a head shifting means. First tracks are formed on a magnetic tape during forward driving of the magnetic tape across the rotary head drum. On the other hand, second tracks are formed adjacent to the first tracks during reverse driving across the rotary head drum. Since the first and second tracks are formed by means of the azimuth-pair-head, azimuth gaps thereof will have a different or symmetrical obliquity to each other. This successfully avoids cross-talk between adjacent tracks to allow formation of the first and second tracks in a tightly arranged fashion. As a consequence, high-density longitudinal recording without cross-talk between adjacent tracks becomes possible.

Abstract: A frequency modulated signal reproducing device includes a reproducing device for reproducing a frequency modulated signal from a recording medium; a pilot signal generating circuit for generating a pilot signal relative to a discontinued part of the signal reproduced by the reproducing device; a phase lock circuit which generates a phase locked signal which is phase locked relative to the reproduced signal; a demodulating circuit for frequency demodulating the phase locked signal; and a control circuit for controlling the response speed of the phase lock circuit on the basis of the pilot signal.

Abstract: In a digital video tape recorder designed for recording each unit of video data in a plurality of tracks simultaneously by the use of a plurality of magnetic heads, the shift value between a track scanned by a magnetic head in a reproducing mode and another track recorded previously by the same magnetic head is decided from the majority of shift values obtained with respect to the individual magnetic heads, and the contents of identifying signals included in the pickup data are determined in accordance with the majority-decided shift value, whereby accurate shift values and identifying signals are ensured to consequently realize satisfactory picture reproduction.

Abstract: A video tape recorder for recording two-channel component signals of a video signal on a magnetic tape and for reproducing the recorded signals includes a recording signal processing system for processing the two-channel component signals into first and second recordable signals, an electromagnetic conversion system including two pairs of magnetic heads for recording the first and second recordable signals, respectively, on the magnetic tape and for reproducing the first and second recorded signals, respectively, and a reproduced signal processing system for processing the reproduced signals into representations of the original two-channel component signals. Each pair of heads of the two pairs of heads are disposed so as to be apart by 180.degree. from each other on a rotary cylinder and so as to be apart by 90.degree. from each head of the other pair of heads.