Abstract: A first head changeover signal generation circuit generates a first head changeover signal to be used for switching between first heads and between second heads. A second head changeover signal generation circuit generates a second head changeover signal to be used for switching between the pair of first heads and the pair of second heads. A head amplifier selects one of FM field signals reproduced by the first and second heads in accordance with the first and second head changeover signals, and a FM detection circuit converts the selected FM signal into a video signal. A pseudo vertical sync signal generation circuit generates a pseudo vertical sync signal in accordance with the first and second head changeover signals. A switch selects, in accordance with the second head changeover signal, one of the as-produced pseudo vertical sync signal and a delayed pseudo vertical sync signal delayed by a variable delay circuit. The selected pseudo vertical sync signal is added to the video signal.

Abstract: System for recording/writing on a recording medium in which there are distributed, on the tracks, groups (G0) of tracks with positive continuous components and groups (G1) of tracks with negative continuous components. In reading, the values of the different signals are integrated for each track. Then, on the one hand, a first addition circuit S1 adds up the results of integration of the first tracks of each group of tracks and, secondly, a second addition circuit S2 adds up the results of integration of the last tracks of each group of tracks. A comparison circuit (CD) compares the results of additions of the two addition circuits to correct the track-following operation.

Abstract: A direct file access system for a magnetic tape where all data files begin at a designated location on the tape. The direct file access system may be used with a reduced rewind data configuration to decrease data access time. The reduced rewind data configuration divides data files into generally equal portions so that data files begin and end at the designated location on the tape, eliminating rewind sequences. A method and system for reducing the number of tape retensioning passes is included to further decrease access time.

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 magnetic recording/reproduction apparatus comprises a magnetic tape running apparatus to rotate a rotary drum and run a magnetic tape with the magnetic tape being in contact with, at least, part of the circumferential surface of the rotary drum, a plurality of erasing magnetic heads installed on the rotary drum so that the magnetic tape are in contact with the heads and used to erase recording signal, a plurality of recording magnetic heads used for recording, a plurality of erasing circuits installed on the rotary drum to output erasing signal to each of the erasing magnetic heads, a plurality of recording circuits connected to the recording magnetic heads respectively and installed on the rotary drum so that the recording circuits are selectively be gone to active state and non-active state, one or more rotary transformers connected to erasing circuits in common, and a driving circuit to record information signal in the magnetic tape through recording magnetic heads, recording circuits, and rotary transfo

Abstract: An image signal recording and reproducing apparatus comprises a head array having a plurality of head gaps for recording and reproducing the image; a piezoelectric actuator having a polarization direction and for moving the head array downwards and upwards in a width direction of a track in accordance with input of a driving voltage; a phase comparator for generating a phase control signal in accordance with a phase difference between the head array and the track; a unit for outputting the driving voltage to the actuator in accordance with the phase control signal; and a signal processing unit for recording and reproducing the image signal on and from the track by the head array.

Abstract: An image signal recording and reproducing system of this invention includes an apparatus for reproducing an image signal from a recording medium on which the image signal is recorded in a recording format selected between a first recording format for forming tracks on the recording medium by recording the image signal for one picture on the recording medium and a second recording format for forming, on the recording medium, tracks greater in number than the tracks formed in the first recording format.

Abstract: A drive circuit having two electronic switches formed from N-MOS transistors is designed to alternatively connect the input of a preamplifier stage to a first or second read sensor on the read head of a magnetic tape. The drive circuit also has a third electronic switch formed from an N-MOS transistor which grounds the input of the preamplifier stage. Based on logic input signals, a control circuit switches the first and second switches, or closes the third switch and simultaneously opens the first and second switches.

Abstract: A method and system for preventing cross-talk during reproduction of data recorded on a high density recording medium. The method includes the steps of receiving signals from at least three consecutively parallel information tracks on a recording medium, determining first and second cross-talk coefficients representing a degree of cross-talk between the three parallel information tracks, filtering the first and second cross-talk coefficients, correcting the cross-talk between the first, second, and third information tracks in accordance with the first and second cross-talk coefficients, forming a difference between the first and second cross-talk coefficients and integrating this difference to generate a track following correction signal, and repeating the above steps for each of the information tracks on the recording medium.

Abstract: For the clock extraction from n digital signals read from each of n tracks there are provided n phase-locked loops. In order to compensate for speed variations in the speed of transport of the record carrier there is provided an additional frequency control system. This system derives a control signal which is a measure of the speed variations, which control signal is applied to the voltage-controlled oscillators of all the phase-locked loops as a common control signal.

Abstract: Disc recorder for recording information is comprised of a plurality of disc faces and correspondingly provided heads for recording information on the disc faces, the heads are connected to corresponding recording/reproducing circuits controlled by a control device, the disc faces, the heads and the recording/reproducing circuits constitute recording/reproducing channels. The disc recorder performs recording and/or reproducing operations by utilizing 2 or more of the recording/reproducing channels concurrently where an information unit to be processed in the recording/reproducing channels and recorded on every sector on the disc faces, is adopted to be a logical block unit having a control signal region and a data region. Further feature of the invention is that the control device has an output signal line connected to a host system.

Abstract: A data storage system such as a tape drive or flexible disk drive having a dual-gap head being controlled by a dual-mode flexible disk controller. The flexible disk controller has a first mode designed to use a head having one section for perpendicular reading and writing and a second section for erasing. The flexible disk controller has a second mode designed to use a conventional flexible disk head having a single gap for reading, writing and erasing. The data storage system has a head which has one relatively long gap optimized for overwrite/erase capability and a separate shorter read-only gap optimized for reading high bit densities. The data storage system uses the flexible disk controller in its first mode for formatting and writing and in its second mode for reading. When the controller is being used in a perpendicular recording mode, the head design with the write section offset from the erase section requires extended formatted sector fields.

Abstract: A system is provided which records reproduces signals on/from a magnetic tape in a cassette in longitudinal tracks in two track patterns in two adjacent tape zones which are inscribed/read in opposite directions. The cassettes are non-reversible and comprise one imperforate main wall. Without exception the associated apparatuses comprise, as a standard feature, recording/reproducing signals in the two opposite directions without reversal of the cassette. The system may be constructed as a two-standard system suitable for use with both reversible and non-reversible cassettes in conformity with non-compatible standards on two-standard apparatuses.

Abstract: For the selection of the columns of elementary heads of a multitrack recording head, the method makes use of a bipolar pulse with amplitudes +2I/3 and -2I/3. For the selection of lines of elementary heads, it makes use of pulses with an amplitude of +I/3 or -I/3. And for the non-selected lines, it uses a bipolar pulse that is in phase opposition with respect to the column selection pulse and has amplitudes of +I/3 and -I/3.

Abstract: A method of searching for blanks in a digital tape player with reduced search time by performing the operation of searching for blanks on both sides of an analog recorded tape concurrently. In a digital tape player dedicated to both analog and digital reverse playback, a reverse fixed head component is arranged so that a tape can travel both ways by reversing the fixed head component 1. The head surface of the head component is divided into two tracks and one of the tracks is provided with analog playback head sections 2 and the other track with digital playback head sections 3. In such a digital tape player, analog recorded signals on one of the tracks of the analog recorded tape are being read by the analog playback head sections 2, while analog recorded signals on the other track are being read by the digital playback head sections 3 at the same time, so that blanks on both upper and lower tracks can be searched simultaneously.

Abstract: A method and apparatus for reading data contained in blocks arranged in a number of tracks on a storage medium, wherein movement of the storage medium causes the tracks to deviate from a nominal path, are disclosed. In the method and apparatus, a set of multiple read elements is disposed relative to the storage medium so that each of the read elements covers at least a portion of the expected area in which a track to be read will be found, given movement of the storage medium. Each of the read elements has a read channel uniquely associated therewith, and all of the read elements are used simultaneously to read the data blocks. The read channels are monitored, and a first arriving, correctly read block is selected from among the channels, the selected block being the next block in a sequence, following a previously selected block. The data blocks are then stored at memory locations correlated to their position in the sequence on the storage medium.

Abstract: In a magnetic storage system including a data conversion unit for performing reading or writing of data from or to a magnetic tape medium, and a system control unit, the data conversion unit has a plurality of electromagnetic transducers which are arranged so as not to overlap with one another in a travel direction of each of a plurality of recording tracks provided on the magnetic tape medium, and performs the reproduction of the data from each reproducing track using one of the electromagnetic transducers a plurality of which are assigned every recording track. In the system control unit, an error included in the regenerative data is detected. When an error is detected, the one electromagnetic transducer which performed the reproduction when detecting an error of the data is switched to another electromagnetic transducer assigned every recording track, thereby to perform the reproduction properly.

Abstract: Circuitry is provided that interconnects a plurality of MR heads on a substrate with control circuitry using a lesser number of interconnecting paths. This reduces the number of required substrate pins to which the interconnecting paths are connected. The reduced number of substrate pins is such that it enables manufacturing and processing techniques to accommodate an increased number of MR heads on a given substrate over that which would be possible with the prior art interconnecting techniques.

Abstract: A recording and reproducing apparatus is to monitor the information to be recorded actually by the recording heads. The recording and reproducing apparatus comprises a digital mixer for inputting signals from the multiple preceding reproducing heads corresponding to the multiple recording tracks respectively and performing the prescribed signal processes and simultaneously outputting the signals inputted to the monitor speaker, and cross fader circuits for shifting signals from the digital mixer or the multiple preceding reproducing heads and outputting to the recording heads placed on the back of the preceding reproducing heads, and which is adapted to rewrite the information recorded on the first recording track of the recording medium to the second recording track.

Abstract: In a device for the reading of a set of resistive elements (1.0, . . . , 1.n) in which an interrogation potential (V.sub.0) is applied at each instant to an element while a reference potential (v) is applied to the other elements, a stabilization circuit (CS) operates to keep the reading ports (L.0, . . . , L.n) at the reference potential. The present invention may find particular application to the reading of the elementary magnetoresistive heads of a magnetic reading head.

Abstract: An external memory device subsystem and a data recording device, which issue a command specifying previously a plurality of tracks in a rotary type memory device prior to a read or write instruction issued from the data processing unit of higher rank to the rotary type memory device through a control unit; select continuously the plurality of tracks previously specified, at executing a read or write command after the execution of the command; and in this way can read/write continuously without wait time for rotation a plurality of tracks distant from each other within the same cylinder.

Abstract: An analog/digital compatible reproducing system is disclosed, particularly a stationary head system using a digital recorded magnetic tape having a plurality of n, digital data recorded tracks. An analog recorded magnetic tape has a first analog recorded track and a second analog recorded track between which a guardband of a certain width is provided. Signals are reproduced from the digital recorded magnetic tape by driving n reproducing magnetic head elements respectively corresponding to the n digital data recorded tracks. The analog recorded magnetic tape is reproduced by driving a plurality of m reproducing magnetic head elements of said n reproducing, magnetic head elements, corresponding to the first and second recorded tracks so that common outputs can be produced from the m reproducing magnetic head elements. There is also disclosed a tape cassette used in such system.

Abstract: A digital recording and reproducing method and system by which a desired control code can be recorded onto and reproduced from an analog record tape to improve the operability in reproduction of such analog record tape. A fixed head unit is used which has a first track face on which an analog head is provided and a second track face on which a plurality of digital heads are provided. Upon analog reproduction or recording onto or from one of a pair of analog tracks of a tape by means of the analog head, a desired control code is digitally recorded onto a non-recorded gap portion of the other analog track using a particular one of the digital heads. Then, upon analog reproduction by the analog head, the digitally recorded control code is read out from the tape using the digital heads.

Abstract: A magnetic reading and/or recording apparatus includes a plurality of magnetic reading and/or recording elements to read and/or record information from/on a flexible magnetic recording material and a flexible plate having several cut-outs arranged to define individual flexible sections of said plate between respective pairs of said cut-outs. The magnetic reading and/or recording elements and the flexible plate are arranged to position the flexible sections of the plate to support respective flexible sections of the flexible magnetic recording material substantially in contact with the magnetic reading and/or recording elements.

Abstract: A magnetic reading device, of the type comprising multiple magnetic read heads, incorporates read heads each formed by a magneto-resistance element having a resistance which varies as a function of an outside magnetic field. The magnetic reading device comprises a network of line conductors intersected with a network of column conductors to form intersections at which a read head is provided. The first and second ends of each magneto-resistance element forming the read heads are respectively connected to a line conductor and to a column conductor of the corresponding intersection, and a control voltage is applied to the line and column conductors by a switching element for each line conductor, column conductors being connected to a current sensor. A simplification of the control of read heads results from this arrangement, while avoiding the effect of the heads not selected on the variations of current coming from the selected heads.

Abstract: The disclosed system comprises: 1) a transmissive frequency shifter based on reflection from rotating flat surfaces and from stationary involute surfaces; 2) system to compensate for effects of rotation rate instabilities and certain imperfections in the frequency shifter's reflection geometry, and a system to multiply the frequency shift obtainable by an integer number n through an n-fold re-use of stationary reflecting surfaces.

Abstract: Apparatus is provided for reproducing either M channels of digital audio signals recorded in longitudinal tracks on a record medium or an analog audio signal recorded in one or two stereo tracks. M heads are used to reproduce the M channels of digital audio signals and N of those heads (N.ltoreq.M) are used to reproduce the analog audio signal. The reproduced digital or analog audio signals are multiplexed and digitized. When digital audio signals are reproduced, the digitized multiplexed signals are digitally processed and then converted to analog form. When analog audio signals are reproduced, the digitized multiplexed signals are summed such that signals reproduced by the N heads are combined to form a digital representation of the recorded analog audio signal. The summed signals then are converted to analog form to recover the original analog audio signal.

Abstract: In a recording and reproducing apparatus according to the present invention, a drum unit incorporates a first recording/reproducing control head. A second recording/reproducing control head is disposed within a running path of a magnetic tape. A control signal synchronizing with a record starting point of recording tracks is recorded by the first or second recording/reproducing control head. The second recording/reproducing control head is controlled in accordance with a state where the control signal is recorded or reproduced by the first recording/reproducing control head, thus recording or reproducing the control signal. A deviation in tracking which is caused due to stretching/contraction of the magnetic tape can be effectively avoided. The control signals can be recorded or reproduced more surely than in the prior art.

Abstract: A portable audio apparatus allows a user to sing along with the recorded song, the user's voice and recorded song being outputted through a speaker. The apparatus permits the recorded lyrics or recorded tune of the song to be substantially eliminated prior to being reproduced by the speaker. The apparatus can operate in a fast forward or reverse mode and will stop between adjacent songs. A power savings circuit interrupts the supply of power to a motor to stop the latter from continuing to operate on a fast forward or reverse mode.

Abstract: A mass storage device includes a media sheet supported on a substrate for storing digital data bit manifestations and a planar, integrated array of transducers arranged in rows and columns. The array is mounted in registration with the substrate, and its columns of transducers are oriented at an acute angle with respect to a movement axis. A piezoelectric device provides relative movement between the substrate and the array of transducers along the movement axis. Circuitry accesses rows of transducers in each column in a timed manner, so as to operate each transducer in a column at the time the transducer is adjacent a row of stored digital data in the media sheet. The acute angular relationship between the transducer array and the movement axis enables digital data to be stored in the media sheet in a fraction of the surface area occupied by an individual transducer and its associated circuitry.

Abstract: A magnetic recording and reproducing circuit comprises a recording and reproducing head including a recording coil; an erasing head disposed upstream of the recording and reproducing head and including an erasing coil; a flip-flop which receives pulse-shaped record data and outputs an output signal which reverses the state in accordance with the pulses of the recording data; a delay circuit which receives the output of the flip-flop and delays such output by a predetermined period of time; a record driver which receives the output of the delay circuit for causing a recording current to flow through the recording coil of the recording and reproducing head; and an erasing circuit for causing an erasing current to flow through the erasing coil of the erasing head at the time of recording.

Abstract: Information storage media, such as cassette tapes or laser discs adapted to be read by machines, such as cassette tape players or compact disc players, has some information stored thereon adapted to be played back at a first speed and other information stored thereon adapted to be played back at a second speed. The storage or playback characteristic of the information on the media will generally vary with the speed at which the information is adapted to be read and the information is divided between the two speeds based on such characteristics. The media may advantageously be used to provide full text readings of magazines, newspapers, books, etc., and to provide indexing for such full text readings. The full text readings are broken into separate informational items, such as the individual magazine or newspaper articles or book chapters, which are stored on the media to be read back at a slow speed while individual summaries of the separate information items are stored to be read back at a faster speed.

Abstract: An external memory device subsystem and a data recording device, which issue a command specifying a plurality of tracks (surfaces) in a rotary type memory device prior to a read or write instruction being issued from the data processing unit of higher rank to the rotary type memory device through a control unit; selects sequentially the plurality of individual tracks (surfaces) previously specified when executing a read or write command after the receipt of the command; and in this way can read/write continuously without wait time interruptions when data is discontinuous.

Abstract: A read head arrangement comprising n first read heads (h.sub.a.1, . . . , h.sub.a.n) and n second read heads (h.sub.b.1, . . . , h.sub.b.n) of the magnetoresistance type, n transistors (Tr.sub.1, . . . , Tr.sub.n) and switching means (S), where n is an integer greater than two. The first main electrode (collector) of a transistor (Tr.sub.i) is coupled to an i-th output (U.sub.i) of the arrangement. The second main electrode (emitter) of the transistor (Tr.sub.i) is coupled to a first terminal (t.sub.1) of a first read head (h.sub.a.i) and a second read head (h.sub.b.i). The second terminal (t.sub.2) of the first read head (h.sub.a.1) is coupled to a first terminal (a) of the switching means (S). The second terminal (t.sub.2) of the second read head (h.sub.b.1) is coupled to a second terminal (b) of the switching means (S), of which a third terminal (c) is coupled to a point of constant potential (earth), while i ranges from 1 to n.

Abstract: A magnetic recording apparatus includes a control circuit and a switch which is provided between a recording amplifier and a secondary coil of a transformer for coupling the recording amplifier with a magnetic head, the control circuit stops a flow of a transient current into the magnetic head by controlling an ON/OFF timing of the switch.

Abstract: A mutually and repeatedly reproducible information recording medium, and method for preparing the same, prepared by forming first blocks, adjacent to each other and spaced by space sections, comprising first information on one track of the information recording medium, and forming second blocks comprising second information arranged in the reverse flow direction of information on the other track, so that parts of the other tracks corresponding to the start points of the individual first or second blocks on the one track are always space sections, in which one block of the first or second information is reproduced and, after the reproduction of the block is complete, the information recording medium is run in the reverse direction to reproduce the other track, thereby reproducing the second or first information corresponding to the previously reproduced information.

Abstract: A signal recording/reproducing apparatus equipped with a recording head section for recording signals on a recording medium and a reproducing head section for reproducing the signals recorded on the recording medium. The recording head section is arranged to record the signal to form N recording sub-tracks on the recording medium and the reproducing head section has M reproducing sub-heads which trace the N recording sub-tracks to reproduce the recording signal. The pitch of the M sub-heads thereof is equal to a pitch of the recording sub-tracks and the number M of the sub-heads is greater than the number N of the recording sub-tracks. The reproducing head section is coupled to a reproduction signal detecting section which is turn eliminates the interference and the crosstalk between adjacent tracks from the reproduced signal due to the reproducing head section.

Abstract: A parallel and continuous playback circuit for an audio cassette deck of the double-deck type (A-deck and B-deck) includes signal detectors for detecting the tape signal of the playback head of each deck during playback, pulse generators for generating arbitrary pulses when an unrecorded blank portion is detected by the signal detectors, a deck selector for selecting the playback mode of the A-deck or the B-deck in parallel, i.e. alternately, upon detection of an unrecorded portion on the tape being played back in the other deck and for pausing playback of the tape in the deck in which the unrecorded portion is detected, and an error prevention circuit for preventing erroneous operation of the deck selector after selection of the other deck and upon encountering and unrecorded portion such as as the start of the tape in the selected deck.

Abstract: A recording and reproducing system for performing a read-after-write operation, and for performing automatic tracking. The system includes a magnetic head for recording/reproducing information from/onto a tape. The magnetic head has a first gapped portion and a second gapped portion. The system further includes a reading circuit for reading information recorded on the tape, a writing circuit for writing information onto the tape, a changing device for selectively connecting the first gapped portion to either the reading circuit or the writing circuit, and for selectively connecting the second gapped portion to either the reading circuit or the writing circuit, and a comparator for comparing the outputs from the first and second gapped portions when the first and second gapped portions are each connected to the reading circuit by the changing device, and for outputting a signal representative of that comparison.

Abstract: A magnetic recording apparatus using a rotatable magnetic disc as a recording medium, includes a composite magnetic head having integrated erase (E1 & E2) and read/write gaps (R/W-1 & R/W-2) separated from each other in a longitudinal direction of a recording track on said magnetic disc to erase and record/reproduce data with respect to said magnetic disc, said composite magnetic head being arranged for carrying out 2-field image recording with respect to a pair of adjacent tracks on said magnetic disc. A double record instructing device (62, 64, 29, 30) is provided for generating a double record instructing signal in response to an operation of a user and a controller (17, 19, 20, 25, 26) is provided for controlling a head driving sequence (FIG. 12) in response to a double record instructing signal for carrying out a double recording operation, by erasing one of an image data of a pair of image data of adjacent tracks and then recording another image data on the erased track.

Abstract: A video signal reproduction apparatus having a plurality of heads arranged to alternately trace the tracks on a tape-shaped recording medium one at a time for every predetermined period, wherein while the medium is being transported at the same speed as when recording, the recorded video signals are reproduced, whereby if it happens that one of the plurality of reproducing heads fails to sufficiently pick up the video signal, the reproduced signal of that head is replaced by that reproduced signal of one of the other reproducing heads which has been stored in a memory which is capable of storing video signals for at least the aforesaid period.

Abstract: A multichannel communications recorder with capability to display channel activity, failsafe back-up, and a unique identification code; and apparatus for securing access to the recorder. The recorder is formed from modular elements configurable into a large number of selectable configurations. One or more record decks are controlled by a control module which includes a system control microprocessor and a CRT control microprocessor. Control is provided by selecting functions defined in accordance with a displayed page or moving to another page using softkeys. Access to various pages is controlled by various passwords. Because of the need to provide physical security for recorded tapes, each tape deck is secured by an electro-mechanical lock, which operates under system control. The system is provided with the capability to be configured in configuration providing back-up for selected channels.

Abstract: A method of recording a stereo audio tape having a pair of stereo tracks on each side with a monaural signal of sequence dependent information, and a tape produced thereby. The sequence dependent information is divided into four quarters with the first and second quarters being recorded onto one stereo channel on the two sides of the tape, and the third and fourth quarters being recorded on the other stereo channel on the two sides of the tape. The entire monaural recording is replayed by adjusting the balance control only once during the course of replaying the tape. An adaptor device is provided to adapt stereo systems without balance controls to the replaying of the prerecorded tape.

Abstract: The present invention relates to a control circuit for a double deck cassette tape recorder, and comprises switches, resistors, transistors and diodes. A plurality of transistors control the specific circuitry functions of the tape recorder. These transistors are in turn controlled either by switches, directly or indirectly, through other transistors. The present invention offers advantages such as simple structure, low production cost, ease of operation and prevention of confusion or mistakes in operation.

Abstract: In a horizontal recording medium, new information can be overwritten upon old information at a low recording density without erasing the medium. In a perpendicular recording medium, on the other hand, new information is recorded at a high recording density after having erased the medium. On the basis of the above features of the horizontal and perpendicular recording mediums with different recording densities, the apparatus comprises first magnetic head with a long gap for the horizontal recording medium, a second magnetic head with a short gap for the perpendicular recording medium, and a heat selector, in order to provide a magnetic recording and reproducing apparatus compatible with both high and low recording density mediums.

Abstract: In a magnetic head drive apparatus of this invention, a coil of an erasing head is connected to a center point of the coils of a read/write head, and a drive current from a constant-current source is alternately supplied to both terminals of the coil of the read/write head, according to the polarity of the write data. When the read/write head is driven to write data in a magnetic recording medium, the erasing head and the read/write head are driven at an identical timing. In this case, the drive currents for the read/write head and the erasing head are supplied from a single-current source. For this reason, separate constant-current sources are not necessary for the read/write head and the erasing head.

Abstract: This invention relates to an autoreverse double deck system which enables the respective side of two tapes inserted in the double deck to be played or recorded continuously in sequential or alternative forwarding mode. A head selection switch 10 produces a timing pulse upon each autoreverse operation and a deck operation control unit 25 produces a clock pulse by differentiating the said timing pulse. The said clock pulse toggles two flip-flops FF.sub.1 and FF.sub.2 in turn. Switches S.sub.31 and S.sub.32 for deciding the deck operation mode respectively receive one of output signals of the said flip-flops and voltage of power supply B to turn on the associated motor driving transistor Q.sub.1 and/or Q.sub.2, whereby main motor M.sub.1 and/or sub-motor M.sub.2 can be rotated in a certain operation mode. A switch S.sub.4 functions to select one motor to start preferentially between said motors M.sub.1 and M.sub.2. A pulse generator 15 or 20 produces a pulse for driving said selected motor M.sub.1 or M.sub.

Abstract: A multitrack magnetic recording and reproducing device of the type, which converts analog signals into digital signals and records and reproduces such converted data by splitting onto a plurality of tracks, comprises heads for both high and low recording densities such that track pitches corresponding to them are at an integral ratio. It includes a reproducing circuit having detecting-decision making means such as multiplexers which, when information recorded by a head for lower recording density is reproduced by corresponding heads for higher recording density, is adapted to determine whether any of the outputs from these heads is incorrect.

Abstract: A recording apparatus has a plurality of erasing heads arrayed aslant to the direction in which a strip-like recording medium is to be transported. An erasing operation on recorded information on the recording medium obliquely begins and obliquely ends by switching the erasing heads on and off one after another along an oblique recording track on the recording medium to accomplish information editing without introducing noises.

Abstract: A video processing system which allows sequences of video pictures to be transferred to disc stores in real time. These sequences can be read out of the disc store and processed before being returned to the disc store to be read out in real time. This effect is achieved by employing disc stores with five parallel heads so that five bits of information can be written in or read from respective tracks on the disc in parallel.