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 magnetic recording system for recording information on a magnetic recording medium magnetized with a perpendicular magnetization component by a magnetic recording head so as to be reproduced by a magnetic reproducing head, the magnetic recording head including a leading side and a trailing side opposite to the leading side, the leading side leading the trailing side in terms of motion relative to the magnetic recording medium, the magnetic recording head generating a first magnetic field with a field strength from the leading side to the magnetic recording medium, and generating a second magnetic field from the trailing side to the magnetic recording medium, a field strength of the second magnetic field being smaller than that of the first magnetic field.

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 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: A device (1) for recording and playing back information signals has a connection apparatus (17) via which another such device (35) can be connected to the device (1) in order to carry out a copy operation. The other device (35) emits a control voltage U1 when a high level H with the "playback" mode of operation is switched on in the same. A copy instruction can be intentionally issued to the device (1) for example by actuating a key (46). The device (1) has a first detector (49) for detecting the control voltage U1 with a high level H emitted by the other device (35) and a second detector (50) for detecting an intentionally issued copy instruction. The "record" mode of operation is only switched on in the device (1) in order to carry out a copy operation in the event of both detectors (49, 50) being triggered simultaneously.

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: A video recorder compatible receiver for receiving video data from a video recorder such as a video tape recorder ("VTR"). The receiver includes an error concealment circuit, a digital VTR port adapted for coupling to a VTR and/or a tuner module. The receiver receives digital video data from the VTR by either the digital VTR port or the tuner module. VTR commands may also be received from a VTR. Upon receiving a VTR command indicating that the VTR is operating in trick play mode or upon detecting video data that is indicative of VTR trick play operation, the error concealment circuit of the receiver disables normal play error concealment and enables trick play error concealment. The error concealment circuit may perform temporal and spatial filtering on the video data received from the VTR when trick play error concealment is enabled.

Abstract: A video tape recorder for recording and/or reproducing a stereo frequency-modulated audio signal by a pair of carrier signals of an indispensable first carrier signal and an additional second carrier signal is comprised of a circuit for demodulating the second carrier signal to provide a demodulated output, and a comparator for comparing an amplitude of the demodulated output with a predetermined value. When the amplitude of the demodulated output is below the predetermined value, it is determined that the second carrier signal exists.

Abstract: A device and method for editing a signal recorded on a magnetic disk. An image signal recorded on a first track of the disk is stored in a first memory, and then the signal of the first track is erased. An image signal recorded on a second track of the disk is stored in a second memory, and then the signal of the second track is erased. The signal stored in the first memory is recorded on the second track, and then the signal stored in the second memory is recorded on the first track.

Abstract: A device for reproducing a picture without noises in slow and/or high speed search modes of operation and a method therefor. The device records an address indicative of tape position on a control track of a video tape, the address being comprised of a single address block; jumps over a certain number of the addresses when operating in the slow mode of operation, to perform accurate tracking and thereafter reading picture data, records the picture data in a memory, and reproduces the picture data repeatedly during jumping over the certain number of addresses; switches successively the heads substantially at 1/4 and 3/4 positions of a full control tracking time when operating in the high speed search mode of operation, thereby recording the picture data in the memory so as to form a complete picture of one frame to be reproduced.

Abstract: A method of manufacturing a replicated magnetic reproduction medium, such as a magnetic-tape cassette provided with a music recording, which reproduction medium includes a magnetic tape having a plurality of tracks extending parallel to one another in the longitudinal direction at specified spacings within certain limits from one another. The reproduction medium thus manufactured serves for the reproduction of the replicated signals by a magnetic reproducing head having a plurality of transducing gaps situated at specified spacings within certain limits from one another. During reproduction, a specified normal tape tension within certain limits is sustained, resulting in a normal surface pressure between the tape and the head face of the reproducing head.During replication the tape is moved over a head face of a magnetic replication head also having a plurality of transducing gaps with a certain spacing from one another.The the tension in the tape is increased relative to the normal tension.

Abstract: Disclosed are an editing apparatus and a method in a vide tape duplicating system for effectively editing using an automatic search function of the starting and ending points of a program to be edited. The editing apparatus includes a key input, an edit adjuster, a playback system, a recording system, a display and a system controller. The edit adjuster controls the editing operation to allow a playback signal within a preset editing section output from the playback system to be recorded on the recording system in accordance with the output signal of the key input. The editing method is performed by a first editing step of setting starting and ending points for at least one editing sections on a recording medium in the playback driver, and controlling the editing operation by the detection of the starting and ending points marking information on the editing section which is randomly set from points between the initial point and the final point of the recording medium.

Abstract: A read/write amplifier provides a magnetic disk unit capable of reducing variations of the bias voltage. An output stage provides a DC bias circuit for the read signal and a circuit for producing a high impedance for the read signal. A switch circuit is in a closed circuit operation only when a chip select signal is received. The output stage provides a switching order to connect a constant current circuit to the amplifier circuit at read time and to connect the DC bias circuit at the write time.

Abstract: A video signal is duplicated in a reduced time by using n video tape recording devices having rotary heads reproducing the video signal from respective recording media at a normal rotary head rotational speed and transporters transporting the respective recording media at n times a normal transport speed. The reproduced video signals are offset from each other by one frame of the video signal, and are timebase compressed, selectively delayed and combined into an n times normal speed reproduced signal, that is, a video signal with its timebase compressed by 1/n. The n times normal speed reproduced signal is recorded by at least one video tape recorder on a recording medium at an n times normal recording speed, thereby duplicating the original video signal. An audio signal may also be duplicated in this manner.

Abstract: In accordance with an illustrative embodiment of the present invention, a magnetic tape which has seismic data thereon and which has been stored for so long that stiction is a problem is temporarily placed in an environmentally sealed room and subjected to a temperature of about 140.degree. F. and a relative humidity of 20% or less for about 48 hours. After removal from the room and cooling down to ambient temperature of about 70.degree. F. in the presence of relative humidity of about 50%, the tape is cleaned and retensioned on a reel. The data then can be read out onto another media with recovery of practically 100% of the seismic data.

Abstract: A magnetic disk drive is disclosed which has a tunnel erase head assembly comprising a read/write head for writing and reading data on a magnetic disk, and a pair of tunnel erase heads for trimming a pair of opposite marginal edges of the record track being formed by the read/write head, with the consequent formation of spaces intervening between the record tracks. The spaces created on the same disk by different disk drives may be of one polarity of magnetization or the other, with the possibility of noise production due to an abrupt change in the polarity of magnetization as the read/write head scans any of the spaces as a result of mistracking. For the reduction of such noise the coil of the tunnel erase heads is connected to an erase current source via a circuit whereby the erase current is made to have a staircase or ramp rise and fall.

Abstract: A system which records and reproduces a digital signal in the form of a magnetic reversal on and from a recording medium includes a magnetic head for reproducing data recorded on the recording medium; an automatic gain control unit for controlling the reproduced signal so as to have a constant amplitude; an equalizer for processing the output waveform from the automatic gain control unit; a differentiator for changing the output from the equalizer to a differentiated waveform; a low pass filter for limiting the signal band of the differentiated waveform; a low pass filter for limiting the signal band of the equalizer output; a pulser for receiving the equalizer output, the band of which is limited by the low pass filter and the differentiated waveform, the band of which is limited; a differentiator for receiving the output from the automatic gain control unit and producing a differentiated signal from the output signal; an attenuator for attenuating the differentiator output; and a waveform processor for addi

Abstract: In a multi-channel data recorder, digital data for recording is converted to words of reduced length, and data for identifying the data channel is added to the reduced-length data words to produce a signal having a word length compatible for recording by a conventional data recorder.

Abstract: A digital signal regeneration apparatus measures regeneration output pulses produced by binary-coding an analog signal acquired by reading information from a recording medium to regenerate a digital signal recorded on the recording medium, comprising a pulse spacing extracting circuit for extracting a pulse spacing of a binary-coded regeneration output pulse, a pulse multiple detecting circuit for detecting a multiple indicating how many times a pulse spacing the pulse spacing extracting circuit extracts is larger than a reference cycle, a reference cycle calculating circuit for calculating a new reference cycle using the pulse spacings and multiples of a plurality of predetermined contiguous regeneration output pulses sent from the pulse spacing extracting circuit and pulse multiple detecting circuit, a clock generating circuit for generating a demodulating clock using the reference cycle the reference cycle calculating circuit calculates, a clock synchronizing circuit for synchronizing a demodulating clock

Abstract: A circuit for monitoring the recorded state of audio signals from a microphone on a magnetic tape. The circuit comprises an additional head having only a playback function. The head functions to detect an audio signal recorded on the magnetic tape. The detected audio signal is then applied to an outer speaker, via a switch. Accordingly, the user can monitor completely the recorded state of the audio signal on the magnetic tape in the record mode operation of audio device.