A magnetic tape transport controller for a magnetic recording and reproducing apparatus in which a pilot signal for tracking control having four different frequencies is recorded on a magnetic tape by a rotary magnetic head and the magnetic tape is transported in a playback mode at a different tape speed than that in a recording mode. The tape transport controller has means for detecting an amplitude change of a specific one of signals derived by frequency-converting a reproduced pilot signal and controlling the tape speed such that the frequency of the amplitude change is maintained at a predetermined frequency. It also has a phase control loop to control the tape speed such that a phase of the specific signal coincides with a phase of a reference signal. In the playback mode in which the tape is transported at the different speed than that in the recording mode, frequencies of a local pilot signal used to frequency-convert the reproduced pilot signal are switched in the opposite order to that of the switching of the frequencies in the recording mode. A detection circuit which detects a difference between two frequency converted signals of different frequencies and amplifies the difference inverts a polarity of an output signal for each track switching in a standard speed playback mode and does not invert the polarity in a variable speed playback mode.

Variable speed playback controller for a video tape recorder

A magnetic recording/reproducing apparatus for sequentially recording each of four pilot signals of different frequencies on each video track to be multiplexed with a video signal and reproducing the video signal and the pilot signals at which time the pilot signals are separated from the video signal and used as a tracking signal to control the transport speed of the magnetic tape, wherein upon reproduction the levels of the pilot signals reproduced from the right and left adjacent video tracks are detected and one of the reproduced pilot signals from the right and left adjacent tracks is controlled in its level so that the tape travelling speed is controlled to make the center of the video head scan the same position on the track as upon recording

Magnetic recording/reproducing apparatus

Disclosed is a digital video tape recording apparatus which converts a vertical interval of picture data into image blocks. The digital picture element data are DCT or ADRC coded (8) and recorded. The video tape is selectively driven at first or second speed, wherein the second speed is approximately 1.5 times faster than the first speed. The digital video recorder includes two rotatable transducers (13A, 13B) disposed approximately 180° apart, each having a recording gap length, or head width, for recording a track pitch. This gap length is at least equal to the track pitch that is recorded when the tape is driven at the second speed. The transducers (13A, 13B) have respectively different azimuth angles to minimize crosstalk interference during playback.

Digital video recorder operable in standard and long play modes

A variable-speed picture reproducing apparatus for obtaining noise-free slow-motion reproduction pictures suitable for use in a helical-scanning magnetic picture recording/reproducing system in which the tracking pilot signal is recorded along with the video signal on the video track. The apparatus include a drive for transporting the tape intermittently, a detecting arrangement for detecting that the tracking error signal derived from the pilot signal picked up during the intermittent tape transportation rises or falls across a predetermined level, and a control arrangement for performing tape stop control including a reversal braking for a capstan motor of the drive upon expiration of a delay time determined by a predetermined computation following the time point of the detection of the signal level.

Variable speed picture reproducing apparatus for video tape recorder

PURPOSE:To run a tape so that less noises appear on a screen during still reproduction by generating intermittent driving pulses when a tracking error signal is not within a set voltage range and running the tape intermittently. CONSTITUTION:During still reproduction, a still command signal input terminal 66 is held at a level H, so the output of an inverter 64 goes down to a level L and the output of an NAND circuit 63 goes up to the level H. On the other hand, when a video head 4 is not on both adjacent tracks, the output of a window comparator 52 is held at the level H unless the output of a holding circuit 51 is between reference voltages VL and VU, and the output of an AND circuit 57 is held at the level H while the output of a monostable multivibrator 56 is at the level H, thereby inputting it to a motor driving circuit 31 through an off circuit 58 and the side S of an electronic switch 30. This switch is placed on the side S while an input to a terminal 66 is at the level H. Therefore, if the still reproduction is commanded, a motor 32 is driven intermittently while the output of the circuit 58 is at the level H, running the tape to an optimum position.

Magnetic video recording and reproducing device

A pilot signal recording and reproducing system comprises a frequency generating circuit for successively generating a first frequency, a third frequency, a second frequency, and a fourth frequency in this order or in a reverse order for every recording unit of one track, where the first and second frequencies are mutually separated frequencies, selected from a first frequency group, and the third and fourth frequencies respectively are frequencies approximately equal to the first and second frequencies, selected from a second frequency group, a recording device for recording a frequency obtained from the frequency generating circuit as a pilot signal together with an information signal onto a recording medium, a comb filter for frequency-selecting pilot signals recorded on both sides of a track which is to be reproduced, where these pilot signals have mutually different frequencies and are included as crosstalk within a reproduced signal reproduced from the recording medium, a control circuit for controlling a delay time of a delay circuit within said comb filter and first and second filter circuits for respectively discriminating and separating pilot signals having mutually different frequencies obtained from the comb filter.

Pilot signal recording and reproducing system

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.

Magnetic video tape recording and reproducing apparatus

"steuersignal-aufzeichnungs- und wiedergabesystem"

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 exending outward of the first portion. A main information signal is recorded into a main information recording track (111, 112) 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 (121-127) on the magnetic tape which extends along an extension line of the main information recording track and which extends in a region corresponding to the second portion of the predetermined angular range. A plurality of magnetic heads (212-216) 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.

Takashi Uchimi

Papers

Pilot signal recording and reproducing system

Magnetic video tape recording and reproducing apparatus

"steuersignal-aufzeichnungs- und wiedergabesystem"

Magnetic recording and reproducing apparatus