Abstract: A magnetic recording/reproducing apparatus equipped with a rotating drum having on its circumferential surface video signal heads for recording and reproducing a video signal on and from a recording medium and PCM signal heads for recording and reproducing a PCM audio signal on and from the recording medium. The apparatus further comprising at least a video signal irregularity detecting circuit for detecting a disturbance of the video signal. When detecting the disturbance of the video signal, the irregularity detecting circuit interrupts the recording of the PCM audio signal onto the recording medium in the case that the apparatus simultaneously records the video signal and PCM audio signal.

Abstract: In a magnetic disk recorder, a displacement of recording timings of a video signal and a timebase-compressed audio signal on a master disk can be corrected on a slave disk. When an output of a master disk reproducing apparatus is a video signal, a vertical synchronizing signal from a synchronizing separating circuit is delayed by a delay time of substantially 7H (H is the horizontal period) and supplied to a phase servo circuit in a slave disk recording apparatus as a reference signal, while when the output of the master disk reproducing apparatus is the timebase-compressed audio signal, a start flag signal accompanying with the timebase-compressed audio signal is detected by a flag detecting circuit and the start flag signal thus detected is employed as a pseudo vertical synchronizing signal, which is supplied to the phase servo circuit in the slave disk recording circuit as a reference signal.

Abstract: An information recording and reproducing apparatus of the rotary head type which is simple in construction and allows, when record data to be re-record are prepared, only the prepared record data to be re-record in a postrecording mode readily. The information recording and reproducing apparatus comprises a digital mixer which replaces data reproduced from a selected portion of a recording medium with record data to be re-recorded, and the resulted data are supplied by way of a recording circuit to a pair of recording magnetic heads so that they are recorded to the selected portion of the recording medium. The recording magnetic heads are mounted on a rotary head at mounting heights lower than a pair of recording and reproducing magnetic heads disposed on the rotary head.

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 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: 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 digital VTR is provided with a block segmenting circuit for converting an input digital picture signal into data segmented into blocks of picture elements, an encoding circuit for compressing and encoding the output data of the block segmenting circuit block-by-block, a channel encoding circuit for channel encoding the encoded output data from the encoding circuit, an audio signal encoding circuit for encoding an input digital audio signal, and an additional code generating circuit for generating an additional control code which includes subdata.

Abstract: An apparatus for generating a high speed dubbing signal to be recorded by an external recording apparatus. The high speed dubbing signal, whose pitch is N times that of a digital input signal, is generated as follows. An encoding circuit subsamples the digital input signal consisting of frame signals each of which consists of N field signals, so that each frame signal is compressed by a factor of N to be contained in one field interval. A digital signal recording and reproducing circuit including a recording and reproduction system, records on a tape, at a normal tape speed and at a normal head drum rotational frequency, the compressed signal in such a manner that each field including the compressed signal appears once per frame interval, and then selectively reproduces from the tape the field including the compressed signal at a tape speed N times the normal speed and at the normal drum speed.

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 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 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 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 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.